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Owners of the 2020 GMC Sierra lineup were hoping for a durable, reliable pickup. After all, the company boasts about being “Like a Pro.” However, the faulty electrical system, defective engine, poorly-made structure and dangerous service brakes have caused many to second-guess their choice of vehicle.
Contents
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NHTSA Complaints for the 2020 GMC Sierra
| Complaint Category | Number of Complaints |
|---|---|
| Electrical System | |
| Service Brakes | |
| Engine | |
| Steering | |
| Unknown Or Other | |
| Power Train | |
| Suspension | |
| Vehicle Speed Control | |
| Electronic Stability Control | |
| Forward Collision Avoidance: Automatic Emergency Braking |
Click on other model year to view more problems: 2018 2019
Problems with the Electrical System
The electrical system is more important than most people know, from running the in-cabin electronics to handling the operations of the advanced safety equipment.
An Edmunds comment shows how defective this system is. “The electronic issues are revolving around the LKA (lane control/assist), and collision alert systems. Noticed that vehicle does not alert correctly when lanes are crossed, noticed that vehicles in front are not detected consistently. My vehicle came with the alert system on the seat as well, and it should work with the lane control system but it is very sporadic. The lane correction on steering wheel is spotty. These are supposed to make vehicle safer, but they don’t work. The phone connection with apple car play is also spotty, and at times fails to connect.”
These problems aren’t new or sporadic. In fact, there are class-action lawsuits happening because of the defective in-dash infotainment systems. Aside from that, NHTSA Campaign Number 19V888000 talks about how the battery cable has too much glue on it, causing an insufficient connection to the alternator. This can also create arcing, which can lead to a truck fire. Certainly, a “Pro” wouldn’t miss such a valuable aspect of truck building like these Sierras suffer from.
Problems with the Engine
The engine doesn’t appear to be built with any more integrity. It continues to be a flaming disappointment.
Here’s another Edmunds review. “Recently purchased my 2020 GMC SLT Sierra 1500 (October 2020). Truck was working correctly for the first 2 months, placed 3700 miles and began to notice the following issues. Hesitation while driving and electronic issues. The hesitation led to engine noise and of course the check engine light activated (multiple alerts posted on driver screen as well), and resulted in the following needing replacement. Top end of engine opened, replaced lifters, and oil control valve. Not what a new car buyer wants to hear within the first three months of ownership.”
In conjunction with the malfunctioning engine is a poorly-built fuel system. NHTSA Campaign Number 19V837000 says that affected vehicles have a fuel pump without a regulator, allowing for over-pressurization of the system. Because this can cause the pump to crack and leak, a truck fire could occur. How many ways can GM attempt to start this truck on fire? It seems to be the automaker’s goal at this point.
Problems with the Structure
It’s clear that the manufacturers of the Sierra didn’t take time to make it right, but were in a hurry to get it off of the production line.
Just read about these structure issues left in an Edmunds complaint. “I bought a 2020 GMC Sierra 1500 pickup and the bed assembly is crooked. The dealer told me ‘they are all that way’ and ‘no one ever notices’ and ‘if they do they just live with it…’ This is a joke….buyer beware.”
The construction of the Sierra is poor all around, leading to lots of safety issues. One example is found in NHTSA Campaign Number 20V446000 that states affected trucks have a diffuser part of the Roof-Rail Air Bag that wasn’t crimped correctly, so it might not deploy during an accident. It seems that the Sierra is quick to want to hurt the people that have been loyal to the brand, leaving them vulnerable from every angle.
Problems with the Service Brakes
A final look at the braking system reveals even more concerns that should cause alarm among these truck owners.
An NHTSA complaint states, “The ABS system failed while driving down the road causing the brakes to lock up and caused the truck to spin out of control nearly crashing into another vehicle and jumping over the center divide into oncoming traffic.”
Guess what? There’s a recall on the braking system too. NHTSA Campaign Number 20V116000 says that some trucks have bolts to hold the calipers that weren’t heat-treated. Therefore, these caliper bolts can break under pressure and interfere with normal wheel rotation. Drivability hasn’t been GM’s strong suit anyway, with a class-action lawsuit occurring about the “Chevy Shake.” When defects are named after a brand, it should be a big warning that the company doesn’t know how to make vehicles. The only thing this company is a “Pro” at is recalling vehicles and wasting customers’ time.
Your Lemon Law Legal Rights
Think you have a lemon? Sit back and let the experts work out your lemon case at no cost to you. The law makes GMC pay legal fees. You may be able to get your lemon out of your life. Every year, auto manufacturers buy back, replace or pay cash settlements to thousands of ‘lemon’ owners like you.
Complaint Data
| Category | Engine |
| Date | Mar 14, 2023 |
| State | KY |
| Description | Check engine came on sunday morning the code that through was p0 526 u062f. After calling the dealer and setting maintenance to be done one day later, the truck broke down while driving on the side of the road. The dealer is saying that the belt came off and the tensioner locked up doing damage to the fan clutch and connector. The case, because the code that ran is saying that the belt wasn't going the speed that it was supposed to because the tensioner failed. The vehicle only has 55,000 miles on it. |
| Category | Electrical System, Engine |
| Date | Feb 10, 2023 |
| State | NM |
| Description | Camera always stays on even when I am driving camera still on my dashboard |
| Category | Engine |
| Date | Feb 05, 2023 |
| State | PA |
| Description | Diesel exhaust fluid heater short circuits due to poor design. This issue occurs multiple times, including after being repaired. The failure limits the trucks capabilities until it is entirely unusable. |
| Category | Electrical System, Service Brakes, Steering |
| Date | Jan 20, 2023 |
| State | FL |
| Description | I own a 2020 gmc sierra 1500 4-cyl, turbo, 2. 7 liter with 20k miles and I owned the truck for almost 2 years. All of a sudden my vehicle started receiving multiple warning messages. While driving I stopped, and when traffic stopped in front of me the engine died all the lights were on warning messages on the dashboard started showing up. Electronic stability control, antilock braking system, ecm, reduced engine power, etc., and the brakes were hard to step on it and the steering wheel hard to turn,I took my foot off the brakes and pressed it again to start. It started but the check engine light was still on, this happened four times already and three times while parked when I tried to start, after a few tries giving few minutes intervals, it will start with all the lights on and warning messages on the dashboard start showing up. Electronic stability control, antilock braking system, ecm, reduced engine power, etc., and the brakes were hard to step on it and the steering wheel hard to turn. |
| Category | Electrical System, Service Brakes, Steering |
| Date | Jan 16, 2023 |
| State | MN |
| Description | Normal driving conditions vehicle decelerated and warning lights and notification appeared. Warning were ‘service ecs' and ‘steering assist is reduced drive with care'. Shut off vehicle for 30 minutes and warnings were no longer present and vehicle drove normally. Happened again 24 hours later. Received email notifications from gmc to arrive within one day. This was a know recall of the previous model year. |
| Category | Forward Collision Avoidance: Automatic Emergency Braking, Power Train, Service Brakes |
| Date | Jan 16, 2023 |
| State | MN |
| Description | Rear tires locking up out of no where almost made me jack knife. |
| Category | Electrical System, Power Train, Vehicle Speed Control |
| Date | Jan 03, 2023 |
| State | NH |
| Description | There is an issue that is causing the batteries to die. This in return causes the vehicle to go into limp home mode with no warning. The "issue" was supposed to be resolved by the dealer in march 2022. The resolution was that one battery was bad. The vehicle is equipped with two batteries. Each of which is sufficient to run the vehicle. A single battery failure should not have caused the truck to have a power limitation. Furthermore the issue was not resolved and general motors and the local dealership refuse to continue to work on the issue. This is even after filling complaints with bbb. As of november 2022 the issue has cause both batteries to go bad. The dealer has refused to work on the vehicle and it has been out of service for more than 30 days. Secondary issue. The dealer has refused to work on the vehicle but computer is locked by gm so that only gm equipment can see full scope of codes. This means I can not have third parties work on the vehicle. This is can get the vehicle stuck in areas where there is not gm facilities and gm will not provide any assistance as it is not under warranty. This has also prevented me from finding the actual resolution to the problem. |
| Category | Service Brakes, Vehicle Speed Control |
| Date | Dec 27, 2022 |
| State | CA |
| Description | I was stopped at a red light and when the light turned green I accelerated and the vehicle shut off and then came back on. When the vehicle came on I had a service esc light and a system break failure warning telling me not to exceed 62mph. I made it back to my house driving with extreme caution. The breaks were very delayed while driving. |
| Category | Unknown Or Other |
| Date | Dec 23, 2022 |
| State | AR |
| Description | 1. The engine block heater sparked and created a small flash underneath the truck. It can be inspected whenever you would like. 2. Electric spark/fire 3. The problem has not been reproduced nor inspected by the dealer. I would not dare to plug it back in. 4. There were not any warning messages. It happened the first time the engine block heater was plugged in. February of 2022. |
| Category | Structure:body |
| Date | Dec 16, 2022 |
| State | CA |
| Description | Rear window leaking on 2020 gmc truck due to faulty rear window seal and plastic slide. Known issue in 2020 models with a service bulletin already in place. Headliner saturated and black mold showing. Rear back liner has been saturated multiple times and gmc would not refund the cost of a whole new window to be put in and reimbursed. Gm bulletin # is 18-na-383 |
| Category | Fuel/propulsion System |
| Date | Dec 15, 2022 |
| State | TX |
| Description | The fuel pump module failed according to the dealer at 34000 miles . Car stop while driving. Cranks but no start. After resting it for hours I was able to start. Drive couple of miles about 39000 miles it stops middle of driving and couldn't start anymore but still cranks |
| Category | Tires:tread/belt |
| Date | Nov 29, 2022 |
| State | TX |
| Description | Goodyear wrangler trailrunner at, lt275/65r20, factory installed on a 2020 gmc sierra denali 3500. While traveling 60 mph pulling a fifth wheel in south texas on a clear and dry day, the rear passenger tire unexpectedly lost its tread. As we slowed down, it completely lost tire pressure and we ran on the rim until coming to a complete stop. Immediately prior to the incident, the tpms and other safety systems in the truck read normal. There were no system warnings and no objects in the road. It put us in a dangerous situation as we were stopped on the shoulder of the highway right before a bridge and had our 3 children in the backseat. We called the police, but they never sent anyone to help with traffic. The rear fender and the wheel well of the truck were badly damaged. We have the faulty tire and it is available for inspection. |
| Category | Electrical System, Engine, Structure:body |
| Date | Nov 14, 2022 |
| State | OK |
| Description | Plugged in engine block heater and the car erupted in flames. Total loss. |
| Category | Steering, Suspension |
| Date | Nov 11, 2022 |
| State | MN |
| Description | Drivers side upper control arm failure. Threw truck into oncoming traffic. Dealership has inspected multiple times stating everything was good to go. Been complaining about a loud clunk to dealership for months |
| Category | Unknown Or Other |
| Date | Nov 09, 2022 |
| State | AZ |
| Description | Once vehicle is put in park, the control panel comes and reads, “shift in park and radio and head lights stays on as wellâ€. I exit the vehicle and it continues to display the mention above. I've restarted the vehicle and put it back in park still the “shift in parkâ€, stays on. I exit the vehicle and monitored the vehicle for approximately 5 minutes and finally turned off. This never happened before, I'm afraid it may stay on one of these days and run the battery down. |
| Category | Power Train |
| Date | Oct 23, 2022 |
| State | TX |
| Description | My 2020 sierra slt always hesitates or stutters upon take off only on the very first start of the day every day. It appears to be a transmission gear issue or perhaps air/fuel issue. I also have had several different issues with my infotainment system. It screen changes from one screen to another on its own occasionally and it also has a very loud pop when I turn off my iphone xr from the trucks sound system as if it will crack my speakers. I have taken it in to two separate cavendar gmc dealerships in san antonio on 3 different occasions and they claim it does not do either. This cannot be the case as it does it for me every single day since I bought it from the showroom floor. They have said they have updated or reprogrammed both systems but I still have both issues. I am about to lose warranty coverage and I am afraid this will never be addressed. I am taking it in 1 last time. I will never buy another gm product! |
| Category | Suspension |
| Date | Oct 20, 2022 |
| State | UT |
| Description | I was taking my truck to have an oil change and tire rotation at the dealership. I have just traveled approximately 15 miles on the freeway, exited, and entered the parking lot of the dealership. I went over a speed bump at about 5-7mph and felt a clunk, with a grinding sound and the car pulled to the right. I got out of the truck and found the front passenger wheel was hanging off with only the lower connections attaching it to the frame. (control arm maybe?). The service department worker was right there when it happened. He told me they have been having issues with the leveling kits on 2020 gmc sierras causing this issue, especially on the right side. He said that this was not the first that he had seen. Two other people at the dealership mentioned the same thing. I was never notified of the potential failure and possible catastrophic consequences. I contacted gmc who's "product allegation" department told me they could not investigate because the truck was repaired at the dealership. They didn't even review the photos I had sent them. |
| Category | Fuel/propulsion System |
| Date | Sep 24, 2022 |
| State | GA |
| Description | The vehicle shut off while driving. It turns over fine but will not crank. Later cranks but again will shut off and not start. This could get me killed on the interstate. It is pulling trouble code p129f fuel pump power control module. This is a 2020 gmc sierra at4 with a 6. 2 motor with 80,000 miles on it. |
| Category | Power Train |
| Date | Sep 20, 2022 |
| State | FL |
| Description | The exhaust system is directed to the rear of the vehicle and when towing causes extreme heat to build on the item being towed, in my case a 5th wheel camper. The heat has melted the trim on my camper and is a potential fire hazard. |
| Category | Power Train |
| Date | Sep 12, 2022 |
| State | KY |
| Description | Consistent issues with my truck. It is a 2020 gmc sierra 1500 vin: [xxx]. In april 2022, my truck started to exhibit concerning issues. I was worried about driving home from work and called the dealership I bought the truck at. They recommended that I take it to the the service center in frankfort, ky where I work. I drove the truck directly to neil huffman gmc. They declared the truck unsafe for me to drive. They set up rental car for me to use and I left the truck at the service center. They initially said it was the torque converter. Over the course of two months they kept finding more issues. Repairs were completed at neil huffman gmc service center located in frankfort, ky. My truck still has the following issues.. 1. Ringing sound 2. Grinding or clunking noises 3. Loud noise when I press the gas pedal 4. Delayed shifting and hard shifting problem I drive a hour back and forth to work everyday and don't want the truck to have issues on the interstate. Driving with a bad torque converter is unsafe since it causes sudden stoppages and significant speed fluctuations. Worn or slipping transmissions have many warning signs. A damaged transmission creates a dangerous situation for me and for other drivers. I had an appointment at adams gmc in richmond, ky on september 1st. They said they couldn't hear anything and no services were conducted. Neil huffman gmc service department said they replaced basically the entire transmission. I don't understand why there would be issues still. [xxx] information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6). |
| Category | Service Brakes |
| Date | Sep 12, 2022 |
| State | NY |
| Description | Brake pad monitoring system alert came on driver information center warning screen. Brought to local dealer who told me I needed new brake pads. There is a current safety bulletin on the nhtsa. Gov website for the 2019 model year gmc sierra, as well as the 2019 cadillac ct6, but not he 2020 model year. The week prior my driver information center reported front brakes in the high 80's and the rears in the low 90's in terms of percentage of brake life remaining. How can the system go from being safe to being unsafe in a week (and less than 200 miles)? At this point I don't know if my vehicle has a safety problem with my brakes or if there is a sensor and programming issue as described in recall n192264451. I have no observable issues while braking - no pulsing, noise, chattering - that would indicate any brake problems. My only inclination is the alert on the driver information center. Both local dealer and gm customer service are telling me to perform service and pay out of my pocket. This seems inconsistent based on the above recall. |
| Category | Tires |
| Date | Sep 04, 2022 |
| State | FL |
| Description | These tires are good year wrangler trail runner at size lt275/65 r20. My total mileage on these tires was 42,751. These were the original tires that were installed when the truck was purchased new. My tires are rotated every 7,500 miles. Tire pressure is maintained at the exact pressure and in this case was just checked 4 days prior to the incident. I was driving on an interstate at 70 mph. A vibration started. I checked the tire pressure monitors and all showed normal pressures. About 4 minutes later the vibration increased and I decided to pull over. I had slowed to about 45 mph and had my turn signal on, as I was intending to pull on to the right shoulder. Suddenly the left rear tire exploded, and tread had separated. My truck was damaged . All the components in the wheel well are gone or damaged. The left rear 1/4 panel/fender is bent. No repair estimate yet. After the incident I saw zero pressure on that tire indicating on the tpms. |
| Category | Unknown Or Other |
| Date | Sep 04, 2022 |
| State | TX |
| Description | Rear window (the one that faces straight back towards bed of truck) is leaking… haven't taken it in to dealership for repair because I've exceeded mileage so truck is no longer under warranty… not sure how long it's been leaking but I've recently noticed that water stains (runs) on the inside of this window after rains, washes, etc… |
| Category | Suspension |
| Date | Aug 06, 2022 |
| State | WA |
| Description | With out any warning my right wheel had broken when I tried to drive from my dive way to work. Looks like excessive wear to the front-upper control arm ball joints resulted in ball joint failure and wheel separation. Reported to a dealer. Waiting for the appointment to do full investigation. Separation of a front wheel while the vehicle is in motion increases the risk of a crash. I drive in city and highway roads, nothing rough. Very high risk for lots of lives!!!!!! People can die!!! Need immediate attention!!!! Please see https://www. Consumeraffairs. Com/recalls/fox-factory-recalls-gmc-sierra-1500s-and-chevrolet-silverado-1500s-101321. Html concern dated and published on 10/13/2021 why nothing has been done to warn the owners? I smell lots of lawsuits. |
| Category | Engine, Unknown Or Other |
| Date | Aug 04, 2022 |
| State | OK |
| Description | Vehicle engine went out on truck. |
| Category | Tires |
| Date | Aug 04, 2022 |
| State | FL |
| Description | The contact owns a 2020 gmc sierra 2500 equipped with goodyear tires, tire line: wrangler trail runner, tire size: lt275/65/r20, dot number: pj0tjb1v 2319. The contact stated that within a three-day period while hauling a camper on a road trip, all four tires experienced a failure. The contact indicated that the first failure occurred while driving approximately 60 mph; the rear driver's side tire experienced a blowout. During the failure, the driver's side rear quarter panel was severely damaged. The contact stated that later on while driving at an undisclosed speed, the rear passenger's side tire experienced a similar blowout causing damage to the passenger's side rear quarter panel. Additionally, on another occasion while driving approximately 50 mph on the same road trip, the front passenger's side tire experienced tread separation. While at the service center the mechanic discovered that the front driver's side tire had also experienced partial tread separation. The cause of the failure was not determined. The manufacturer and local dealer were notified of the failure. The failure mileage was 25,400. |
| Category | Steering |
| Date | Jul 23, 2022 |
| State | TX |
| Description | I started my truck like normal and my service power steering light drive with care message came on and then service esc and the traction control light. My power steering was completely gone. I researched and found that 2020-21 gmc suvs were recalled due to the same issue. My gmc truck is doing the same thing. I barely made it home from the store not having power steering is extremely dangerous, I still have no power steering. I just purchased this truck from carmax last month. |
| Category | Service Brakes, Steering, Vehicle Speed Control |
| Date | Jul 09, 2022 |
| State | AR |
| Description | The truck stated to have the check engine light on, by the time that happened the brakes were hard to step on it and the steering wheel hard to turn, I had been asking to gmc superior of siloam springs to check the truck because, got scared while I couldn't make stop the truck while on traffic, but they don't had open appointments for that day or the other following days, so a week after they got one and I missed because my work, I set another one at gmc on springdale but they want me to charge me whenever the truck has an extended warranty, so I told them to leave it like that so finally got another appointment at siloam springs location but while driving down there the same thing happened all the light on warning messages on the dash board start showing up and the brakes were hard to step on it and the steering wheel hard to turn, I got told them what was happening, about and how exactly happened. That day after 30 minutes I got a call saying that it was fixed I still asked if they were sure he said yes, the next day I almost crashed with a neighbor at my work place because I couldn't stop the truck, so today I took back the truck and the guy at the desk told me that they may just erase the codes and don't really checked what was wrong, I'm just filling this report because even if I got full coverage on that truck, I'm not gonna be responsible if I'm involved in an accident. |
| Category | Electrical System:12v/24v/48v Battery |
| Date | Jun 28, 2022 |
| State | MI |
| Description | The component that failed was the passenger side or main battery. Our safety was compromised when the design of the hvac system and the battery location allowed the hydrogen sulfide gas into the passenger compartment of the vehicle. The issue has not been confirmed by a deal or independent service center. The battery(s) and vehicle are available for inspection to confirm the issue. I have uploaded pictures of the battery and one can visually see the swollen battery with liquid leaking out of it. There were no warning messages or other symptoms prior to the failure. The rotten egg smell started shortly after the truck was started and my three young children were in the truck for about 10-15 minutes while I was loading items in the bed of the truck. When I entered the vehicle, the smell was extremely strong and my eyes started burning. I opened all the windows to air out the passenger compartment and thought it was possible off gassing from the nearby septic field. Once driving with the windows now closed, the smell came back instantly and very strong. My children started complaining of headache and nausea. For the next part of the trip, we drove with the windows down. When we arrived at our destination, I was able to determine the smell was coming out of the hvac system while in normal "auto" mode. Opening the hood, I went to smell around the engine compartment and when I got over the passenger side main battery, the rotten egg smell was so strong that my nose and eyes instantly started burning. We then drove the truck home with the windows closed and the hvac system in recirculate but the smell still entered the passenger compartment. All four of us had symptoms of hydrogen sulfide poisoning with my son being the worse with multiple vomiting episodes immediately upon exiting the vehicle. Poison control was notified and all four of us were evaluated in our local emergency department for inhalation toxin. The truck is all oem. |
| Category | Vehicle Speed Control |
| Date | Jun 16, 2022 |
| State | FL |
| Description | I investigated and unintended acceleration crash that occurred on 8-9-2021. The vehicle had just left a body shop where it had repairs to the left front of the vehicle near the ecm. The driver reported the vehicle would not slow down. He face timed a witness and showed her his foot was on the brake and not the accelerator pedal collaborating his statement. The 2020 gmc accelerated to 93 miles per hour crashing into the back of a cadillac escalade. Upon impact the fuel tank of the cadillac exploded igniting both vehicles on fire and burning a fed-x truck that was folded in half from the sever impact. The edr report stated the brakes were applied fully for a full 5 seconds prior to the crash while the vehicle was still accelerating. The accelerator was reading a constant 57% during the lead up to the crash and the brake rotors showed heat related glazing from excessive braking. The engine torque was also at 1023nm leading up to impact collaborating unintended acceleration further. Based on the evidence gathered my opinion is there was a short in the components in the left front of the vehicle most likely the ecm harness that caused the crash. It is unknown if the damage was caused by the previous crash, the body repairs or a manufacture defect at this time. The radiator had also just been replaced so moisture could have contributed to the malfunction. If moisture shorts app-1 to app-2 the safety systems can fail to detect a single fault because it causes redundant faults |
| Category | Engine |
| Date | Jun 02, 2022 |
| State | TX |
| Description | I took my vehicle into the local dealership two weeks ago for the dpf emissions voluntary recall. Prior to the service I was getting 16. 6 mpg for the 42000 miles on my truck. After the service, for the ~200 miles driven on same route and conditions commuting to and from work I have only been able to achieve ~13 mpg. There has been no other changes to my vehicle or operating conditions. When I took the vehicle in the advisor mentioned that it may take awhile for the service because “we have to download the update wirelessly.†while researching this issue the recall document specifically warns against wireless download of the update. I am not sure if this may be the result of not following the correct process or not and I am headed back to the dealer today. I also found several others posting on the diesel forums about similar significant loss of mpg after the update. Losing almost 25% fuel efficiency after the update is unacceptable and reflects the my previous experience of efficiency loss during an actual regeneration cycle prior to the update. The vehicle is acting as if it is running in a constant regeneration cycle. Unsure if this may lead to dangerous driving condition due to excessive stress and wear on the affected parts and engine. |
| Category | Service Brakes |
| Date | May 18, 2022 |
| State | AZ |
| Description | This vehicle was involved in a fatal crash when it rear ended an suv stopped at a red traffic light. The driver alleges mechanical failure of the brakes. Police performed a vehicle download which captured 5 seconds of pre-accident data. The download shows the accelerator pedal was fixed at exactly 57% the entire 5 seconds pre-crash while the driver simultaneously applies the brakes the entire 5 seconds. A city bus captured the crash on a dash camera. Despite the driver desperately applying the brakes, the vehicle's speed continued to increase and the driver was unable to avoid the collision, and burst into flames upon impact. The vehicle mileage is less than 2,500. |
| Category | Engine |
| Date | Apr 06, 2022 |
| State | MD |
| Description | A very strong "ammonia" odor comes into the cabin. This happens when the def fluid is going into the exhaust system for the regen process. The odor makes people inside nauseous and dizzy. Must open widows or stop and get out of the vehicle. Our gmc dealer can find no codes or problems with the exhaust system. We have also noticed that the def fluid has gone down very quickly sometimes during this event. It is random. Some days nothing, other trips 3 and four times that the odor occurs. Looking online- there have been many post about this problem. |
| Category | Power Train |
| Date | Mar 23, 2022 |
| State | AL |
| Description | The contact owns a 2020 gmc sierra 1500. The contact stated that while driving at an undisclosed speed, the vehicle shuddered. The vehicle was taken to the dealer however, the mechanic could not duplicate the failure. The vehicle was then taken to gilland chevrolet gmc (3071 n us hwy 231, ozark, al 36360) where the contact was informed that the vehicle already had new transmission fluid filled in the transmission. The vehicle was not repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 42,000. |
| Category | Electrical System, Engine, Vehicle Speed Control |
| Date | Mar 20, 2022 |
| State | NY |
| Description | Def system failed. Wire harness burned out. Tank failure. Truck went into limp mode. I personally know 3 others with the same issue. |
| Category | Fuel/propulsion System |
| Date | Mar 15, 2022 |
| State | PA |
| Description | Def tank system failure. Vehicle is under warranty, 18 months old, (purchased 08/20) with 20,000 miles. 6 weeks ago I took to dealer who informed me that there are no def tanks available and don't know when they will be available. This is a hazard: if I am on a trip and the system shuts off I could be stranded anywhere with the reduced speed that the def system creates. If this system is designed to shut off (with warning) there should be ample supplies at all gmc dealers for repair. If there aren't ample supplies the system should not shut the truck down. This is a safety hazard that is preventable! |
| Category | Electrical System, Service Brakes |
| Date | Mar 11, 2022 |
| State | LA |
| Description | Service trailer brake system alert constantly going off |
| Category | Unknown Or Other |
| Date | Mar 11, 2022 |
| State | PA |
| Description | In short, the diesel exhaust fluid (def) reductant heater failed which requires the entire def tank assembly (part 85138746) to be replaced on my 2020 gmc sierra 3500. This cause the truck to go into "limp" mode where it will not travel above 65 mph, and after another period, the speed continues to be reduced down to 25 mph. Prior to the speed being reduced, there is a warning message that appears stating "service def system see owner's manual" and a warning light illuminates in the gauge cluster. Any severe reduction in speed that can cause the truck to go "limp" is a safety concern. In addition to being a safety concern, some quick internet research reveals that this has been a known problem with gm's def system since at least 2019. The electrical connections are too small for the current which supplied the def tank heater, causing the system to short and trigger the truck into limp mode which renders it useless. The replacement part is on national backorder, and it has been on backorder for years. My truck is completely useless until this part (or a better-engineered replacement) arrives at the dealer, and there are hundreds if not thousands of people waiting on this same, defective part to get their trucks back on the road. People are losing their livelihood and the means by which they support their families. Gm has known about this defective part for years and has done nothing- neither engineered a better part nor issued a recall with some kind of workaround. They haven't even been able to stock the defective part, and this is not just a supply chain issue as new trucks are still being built. This problem was not inspected by any police or insurance agency as it did not cause an accident or injury in this case. |
| Category | Electrical System, Steering:hydraulic Power Assist:power Steering Fluid, Visibility:defroster/defogger/hvac System:rear Window |
| Date | Mar 08, 2022 |
| State | WV |
| Description | The contact owns a 2020 gmc sierra 1500. The contact stated that while driving in the snow, the tire pressure and power steering warning lights illuminated. The vehicle was not diagnosed or repaired. The vehicle was taken to a dealer where it was confirmed that there were no recall or warranties that would cover the repairs for the warning lights. The failure mileage was 140,000. |
| Category | Unknown Or Other |
| Date | Feb 25, 2022 |
| State | PA |
| Description | Def emission system failure. Total component breakdown requiring replacement. Parts unavailable. |
| Category | Steering |
| Date | Feb 08, 2022 |
| State | OH |
| Description | Steering locked up after normal use at lunch. After sitting, traction control light then on and wheel would not turn after work. Did a computer reboot and steering released. Results still pending, she is not home yet. |
| Category | Air Bags:srs Malfunction Warning Lamp/light |
| Date | Feb 02, 2022 |
| State | MN |
| Description | I receive at random times the warning in the dic (driver information center) on the dash of my car together with an air bag warning light. I have had this happen sometimes frequently and sometimes not for a thousand miles. I have taken it in at least 8 times, some parts were replaced in seat belt, but it continues to show up. The problem is it now doesn't leave a code but my local dealer said if it ever came up when I could get it to them to bring it in and leave it running. That happened and I brought it in the ran a computer check and got a code. I had to leave for florida 2 days later, so they said bring it in to a dealer in florida, give them the code, which I did, they checked it but said they will not replace parts without an active computer code. Problem started around 11k miles; I have 32k miles, and dealer wont replace parts unless they know they are bad. |
| Category | Electrical System, Engine |
| Date | Jan 31, 2022 |
| State | TX |
| Description | I have a lifters problem that the dealership takes more that three weeks to fixed without a loaner car, then I have electrical problems where the truck doesn't start at all without any warning and that's it's dangerous, never now where its going happen |
| Category | Suspension |
| Date | Jan 31, 2022 |
| State | TX |
| Description | A vehicle with 45,000 miles had ball joint shear from the upper control arm of front left suspension resulting in wheel separation from the ball joint. Similar situations happening with similar 2020 gmc sierra's (note: nhtsa recall notice, no. 21v718). Could have resulted in a vehicular crash if speed had been increased prior to separation. |
| Category | Electrical System, Engine, Service Brakes |
| Date | Jan 23, 2022 |
| State | KS |
| Description | Truck has had multiple issues related to the electrical system and truck modules. It is my opinion that these are all related to voltage issues or module problems. I have had multiple infotainment issues with delays loading, freezing up etc. Dealer has ran updates and checks with nothing found. In october around k miles the truck radio would not work if I used the push button start. If I shut the truck off opened the door and let everything reset I could push the start button in the truck and the radio would work majority of the time. The next day I went out to a completely dead truck. I talked to my service department at the local dealer and they said I would need to bring it in but suggested I disconnect the batteries and recharge the batteries. After doing so everything started working correctly. It fixed my radio problem and never went dead again. Since then I have experienced popping noises through the speakers when playing music occasionally. Over the last few weeks I noticed the engine does not attempt to increase cold idle speed until I press the brake to put it in gear. January 22nd I hit the autostart button and it did not work. I started the truck and it had cel, traction control, park brake and wrench, lights on with service emissions, and power reduced messages displayed. Truck is running odd. Codes present are (engine gmlan)p0118 - engine coolant temp circuit high voltage, (brakes gmlan_abs) u0401- invalid data from engine control module, p0562- system voltage low, (hvac controls gmlan_hvac) b1325 - . Control module power circuit. Truck is starting and charging fine. No connection issues at batteries. There are many tsb's and many complaints regarding similar issues. Common brake and emissions faults with minor differences. Module failures, communication faults, and or electrical faults are likely causing all of these similar issues. They need to be categorized as the same failure group which will show gm has a bigger issue. |
| Category | Forward Collision Avoidance: Automatic Emergency Braking |
| Date | Dec 17, 2021 |
| State | NY |
| Description | Was driving truck down driveway at about 5km per hour and the parking brake automatically engage bringing the vehicle to a sudden and unexpected hard stop. Brought to dealership, then said they cannot duplicate the problem and therefore there is no action to be taken. |
| Category | Vehicle Speed Control |
| Date | Dec 17, 2021 |
| State | NY |
| Description | While driving truck was setting cruise control at approx 100km/hr. The cruise would set but at approx 70km/hr. Tried to set multiple time throughout the trip but no change. Recorded video and sent to dealer. They brought truck in to check it out, but said that since they can't duplicate the problem they cannot diagnose it. This has happened multiple times and have recorded video each time. Again dealer said they can't do anything unless they see it themselves. |
| Category | Engine |
| Date | Dec 06, 2021 |
| State | CO |
| Description | The contact owns a 2020 gmc sierra 1500. The contact stated that shortly after refueling while driving under 15 mph, the check engine and service emissions warning light illuminated. The contact stated that an unknown reset was performed related to tsb: 10173675 (engine). The vehicle was not yet fully repaired. The manufacturer was made aware of the failure. The approximate failure mileage was 46,000. |
| Category | Engine |
| Date | Nov 23, 2021 |
| State | ID |
| Description | The contact's father owns a 2020 gmc sierra denali 3500. The contact stated that while his father was driving at an undisclosed speed, the check engine warning light illuminated. The vehicle was taken to the dealer and diagnosed with a cylinder #1 misfire. The vehicle was repaired; however, the failure recurred. The vehicle was then taken to wackerli auto center (1363 n holmes ave, idaho falls, id 83401) on numerous occasions and diagnosed with a faulty sensor. The dealer replaced the sensor; however, the failure recurred. The vehicle was not repaired and remained at the dealer. The manufacturer was made aware of the failure. The failure mileage was approximately 20,000. The vin was unavailable. |
| Category | Suspension |
| Date | Nov 21, 2021 |
| State | MN |
| Description | At 8,000 miles I started hearing a clunking noise in my truck when I hit a small bump or back up out of drive way. Brought in and gmc stated it was normal and no issues at walser buick gmc of roseville. Brought I back again because it was getting worse and could hear it every time I slowed down and accelerated. Then stated they need to order spacer bushings at walser of bloomington. Then went back for 3rd time and installed them at bloomington. After 600miles noise was back and is getting worse again. I called walser of bloomington again and said I need to drive it for 1000 miles to break in spacers. So now we have 11,000 miles on truck with same noise again and its going back again because needs to get fixed. Gmc is just asking for something to happen. Also when this first happened at 8,482miles I was on 35w and the rear end started wobbling and gave me a small death wobble but I slowed down to control it. That's when I brought it in and it could of hurt or killed somone. |
| Category | Electrical System |
| Date | Nov 17, 2021 |
| State | WA |
| Description | Infotainment system and center instrument cluster went completely black - six times over the course of one month. I took the truck to alan webb chevrolet in vancouver washington. Their service technician was aware of infotainment system “black screen of death - bsd†problems due to previous repair work on several different gm models. However, on the way to their service department to get this fixed, I rolled down the driver's side window about 6 inches to get some fresh air and rolled it back up. Out of nowhere the infotainment system and the center instrument cluster came back to life. No rhyme, no reason and both stayed on (illuminated). Their service technician could not recreate the bsd. They had my truck for more than one week and said they were working with gm engineers to resolve this issue. Gm case number sr 9-7065134382. I'm driving and towing my 5th wheel blind without a remedy for this electrical issue. |
| Category | Service Brakes |
| Date | Nov 16, 2021 |
| State | CA |
| Description | Brakes have been squealing since 4000 mile mark. Dealer states it's normal. |
| Category | Tires |
| Date | Oct 27, 2021 |
| State | GA |
| Description | The contact owns a 2020 gmc sierra 1500 equipped with goodyear tires, tire line: wrangler at/s, tire size: lt275/65/r20, dot number: pjotjb1v. The contact stated while driving 65 mph, there was a slight wobble and then an impact was felt when the rear passenger's side tire tread separated and damaged the rear fender and bumper. The contact pulled over and had assistance replacing the rear passenger's side tire with the spare tire. The dealer was made aware of the failure and was in possession of the failed tire. The manufacturer was not made aware of the failure. The failure mileage was unknown. |
| Category | Electrical System, Forward Collision Avoidance: Automatic Emergency Braking, Service Brakes |
| Date | Sep 30, 2021 |
| State | MD |
| Description | Own a 2020 gmc sierra at4 with 13k miles and I owned the truck for 1 year. All of a sudden my vehicle started receiving multiple warning messages. Electronic stability control, antilock braking system, ecm, reduced engine power, etc. I see there was a recall for 2019 gmc sierra's for the same issues. Why isn't 2020 gmc sierra's not also part of that recall ? It is ridiculous that a brand new truck has these types of serious issues affecting so many vehicles. Why is gmc allowed to continue to sell later model trucks after the 2019 recall with the exact same esc and anti-lock braking system problems ? |
| Category | Electrical System, Engine, Service Brakes |
| Date | Sep 27, 2021 |
| State | TX |
| Description | Two times while on the freeway the service parking brake and engine lights came on and starting braking. Could not drive over 20 mile an hour. Both times taking to dealer the lights where not on and they could not find anything wrong. I even have video of it happening. |
| Category | Suspension |
| Date | Sep 26, 2021 |
| State | MN |
| Description | The leaf springs appear to have failed. The vehicle is available for inspection. If the leaf spring brakes, control of the vehicle could quickly become an issue. On 9/24/21 I brought my truck into the local gmc dealer for inspection. The service technician indicated the leaf springs show “possible overloading†and recommended air bags to level the truck. The heaviest load for this truck has been a 4,000 lb. Fiberglass fishing boat. At this time, no one else has inspected the truck. The truck, when empty, sits lower in the rear than in the front. If a small trailer is attached, it becomes even worse. Oncoming cars flash their headlights thinking mine are on high beam, which they are not. |
| Category | Power Train, Service Brakes, Suspension |
| Date | Sep 12, 2021 |
| State | NY |
| Description | I purchased the 2020 sierra 1500 because the label on the truck frame states that it can tow 9300lbs. Subsequently, in april 2021, I purchased a 34' travel trailer with a max capacity of 8995lbs. In august, I received a notice from gmc that they overstated the towing capacity by 500lbs. The new towing capacity is 8800lbs. Gmc's response to my request for a refund was that they were not going to help me. Their solution is that I can be provided a new sticker by the dealer upon request. This does not resolve my issue, nor the issue of other sierra owners who purchased this vehicle because of its stated towing capacity. In doing research, it appears that in model year 2014, gmc faced a class action lawsuit for misrepresenting their capabilities. I believe that this malpractice is a safety concern for me and many others. Attached is the towing label on the frame and the letter from gm. |
| Category | Electrical System |
| Date | Sep 06, 2021 |
| State | MO |
| Description | Bought 9-4-2020. On 9-4-2021 went start vehicle and no electrical power, battery dead. Will not hold charge to start. Brand new purchased at morgan gmc in shreveport louisiana |
| Category | Suspension |
| Date | Sep 03, 2021 |
| State | MI |
| Description | I was driving my 2020 gmc sierra at4 at about 15mph on a 2 way city street slowing for a traffic light when my vehicle started to shake violently... At first thinking it was a flat, but the shaking was much different. As I was slowing in anticipation of the light, now at about 5mph, my truck suddenly dropped and stopped. This would have been catastrophic at freeway speeds! I immediately thought maybe someone had tried to steal the wheel overnight as I knew now it was not simply a flat, but knew I had wheels locks and thought that unlikely.... This was while I was exiting my now parked truck. I knew the problem was on the front passenger side, and was shocked as I rounded the vehicle from the front only to find the entire front wheel assembly folded flat under my truck. The entire brake assembly was still intact, but the front drive shaft was pulled out, as well as the upper and lower ball joints. The brake hose became severed in this incident. |
| Category | Electrical System, Forward Collision Avoidance: Adaptive Cruise Control, Vehicle Speed Control |
| Date | Aug 31, 2021 |
| State | FL |
| Description | Issue 1: front left sensor(s), after a rain, car wash and now after an oil change, continuously vibrates the drivers seat and the red light warning stays lite indicating that an obstacle is located near the left front of the truck. This has happened on several occasions and after a time both indicator stop. Issue 2: when traveling on a freeway, twice now, the cruise control suddenly disengaged or decreased mileage, as if it had detected a vehicle in front of us. There was no vehicle within a quarter mile of us front or back, nor any vehicles on the side. No debris in the road either. Usually when the adaptive cruise is set and detects something in front the icons on the dash turn orange and starts to flash. That didn't happen, rather the cruise icon changed to blue in color and the truck slowed. This I would consider a safety risk. Both instances (december 2020 and april 2021) have been reported to a dealership and noted in a file. When the customer care person attempted to get malfunction codes, nothing appeared to be wrong with the vehicle. |
| Category | Engine |
| Date | Aug 12, 2021 |
| State | FL |
| Description | Repeated issues with exhaust and emissions components. |
| Category | Engine |
| Date | Aug 07, 2021 |
| State | TX |
| Description | Found improperly installed rear seals. The truck leaked oil and had to be towed to gmc dealership in monahans texas to be repaired. 1 month later the truck leaked oil again. |
| Category | Engine |
| Date | Jul 19, 2021 |
| State | OH |
| Description | Rear main oil seal failure causing truck to lose all oil, leaking all over truck, trail leading to drive and garage; possibility of engine seizing up while driving causing an accident, confirmed by dealer, covered by warrenty, is a known issue, no warning lights, messages, or other symptoms of problem, nhsta has issued a bulletin for this problem |
| Category | Service Brakes, Steering |
| Date | Jun 17, 2021 |
| State | FL |
| Description | While driving my 2020 gmc 2500 denali with the duramax diesel engine, the power assist for the steering and brakes failed without any warning. This made the truck nearly impossible to steer and stop. Luckily, I was able to avoid a collision and get the truck stopped in a safe location. The truck is currently being towed to rivard gmc in tampa, fl. Doing an internet search, I found this problem has happened to others as well. Please ask gm to rectify this extremely dangerous defect. |
| Category | Electrical System |
| Date | Jun 14, 2021 |
| State | MI |
| Description | Service esc, service power steering, antilock brakes disabled all flashed on information center of vehicle. Service engine light, antilock brake light, esc, low battery all illuminated. Vehicle would not start - try to start it would go through all issues on information center. This is the same esc issue described for 2019 silverado and gmc sierras. |
| Category | Electrical System, Service Brakes |
| Date | May 26, 2021 |
| State | TX |
| Description | The computer lights up dash reducing power and taking the trailer brakes away. This almost caused a wreck when the truck shut off and the brakes failed. This truck has been in the shop at least once per month trying to fix the issues, from computer and brake failure to injector failure. Glenn polk chevrolet in sanger has been working on this since the truck was new. Also we have case open with general motors without resolution. The dash lights up at the same time as the brakes fail. |
| Category | Electrical System, Power Train, Service Brakes |
| Date | May 26, 2021 |
| State | TX |
| Description | The computer lite up the dash and reduced power, plus took the trailer brakes off line. This happened while loaded. To reset the system you have to pull over and turn the vehicle off. This happens 2-3 times per day. This was a problem at 600 miles. The transmission shifted from 10 gear to 5th gear while driving 75 miles per hour. The truck had 75,000 miles on it . Had to send another truck out to pick up the load in santa rosa new mexico. The dealer glenn polk in sanger has been working on for the last 4 months there is never a warning until the lights come on with a system failure. |
| Category | Electrical System, Engine, Service Brakes |
| Date | May 26, 2021 |
| State | TX |
| Description | The computer lights up the dash reducing power and turning off power to trailer brakes. This has almost caused an accident on several occasions . It happens a couple of times per trips. This vehicle has been in the shop a couple of times per month since it was put into service. Glenn polk chevrolet has worked on it each time and the problem is still there. This truck has also had several injector issues. There is an open case with this vehicle with general motors with no resolution. I have filled out forms on each of my 2020 gmc's 3500's. |
| Category | Electrical System, Fuel/propulsion System, Service Brakes |
| Date | May 25, 2021 |
| State | TX |
| Description | The computer malfunctions. It is available for inspection. The computer lights up and causes failure in the trailer brakes. Glenn polk the dealership in sanger texas has been working on a fix but has yet to come up with one. I have spoken with general motors representatives several time trying to resolve the problem without result. I also emailed the ceo last friday and have heard nothing. There were no warning lights until seconds before failure. |
| Category | Electrical System |
| Date | May 24, 2021 |
| State | CA |
| Description | The display for the backup camera and infotainment system became blank. Other owners have the same complaint. This is a serious safety issue because I was backing up when it went blank. |
| Category | Engine, Service Brakes, Suspension |
| Date | May 23, 2021 |
| State | TX |
| Description | On saturday, may 22, 2021, my wife was returning from fairgrounds in waxahachie, tx. She remote-started the car, and the vehicle started. As it started to rain and was getting muddy, and the grounds are in a grass field (no large rocks, hills or debris to climb as it's cleared land), she shifted the vehicle into 4wd high incase the field was slick. She started to drive and received several warning lights, "service esc, service traction control, brake light warning and check engine light". The vehicle also had a noticeable wobble to the wheel and felt off balance, jerky, and had speed limited. My wife turned the vehicle off and back on and some of the lights went off, and the vehicle did not lurch or wobble anymore. The vehicle had a tire changed at the dealer the day prior, so I am unsure if that tire change is related or not. Now the vehicle shows an alert "check engine, service emissions system". I am having the vehicle towed to the dealership tomorrow for diagnostics. All lights except the check engine light have since turned off since powering off the vehicle. |
| Category | Air Bags |
| Date | May 17, 2021 |
| State | TX |
| Description | Airbags failed to deploy after striking a street light pole head-on. The impact hit just right of dead center of the grille and shoved the front end back approximately 2 feet into the engine. There were no dash lights or warning lamps illuminated before the collision. I have notified gm and received a case number. I also have filed an insurance claim and the vehicle has been inspected by a reputable body shop and has been deemed a total loss. A police report was also filed. The vehicle is scheduled to be picked up by the insurance company on 5/18/21. |
| Category | Electrical System, Steering, Unknown Or Other |
| Date | May 01, 2021 |
| State | TX |
| Description | It was fine and we drove to our neighbor, parked about 15 mins. When we started the truck to turn back, the steering was super heavy, with 2 messages pop up on the dashboard: services esc, and service power steering drive with care. Tried several times to re-start the truck, it's keep the same. In our neiborhood, parrot tulip view, pflugerville, tx 78660. Raining all night, not sure if it's related to the weather. |
| Category | Power Train |
| Date | Apr 27, 2021 |
| State | CA |
| Description | Tl* the contact owns a 2020 gmc sierra 1500. The contact stated that upon exiting the vehicle, he noticed that the vehicle was leaking an unknown fluid. There was no warning light illuminated. The vehicle was taken to simpson buick gmc of buena park (6600 auto center dr, buena park, ca 90621) where it was diagnosed with the torque converter needing to be replaced. The vehicle was repaired however, the failure recurred. The manufacturer was not informed of the failure. The failure mileage was approximately 11,000. The vin was unavailable. |
| Category | Air Bags |
| Date | Apr 22, 2021 |
| State | NC |
| Description | Tl* the contact owns a 2020 gmc sierra 2500. The contact stated that upon driving over a hill at 45 mph, a vehicle was stopped in the middle of the road. In an effort to avoid hitting the vehicle, the contact drove the vehicle off the road and into a concrete culvert at the end of the ravine. The air bags did not deploy upon impact. The authorities were called to the scene and the contact was rushed to a local hospital via ambulance. The contact was diagnosed with fractured vertebrae that may require possible surgery. A police report was filed at the scene. Due to the accident, the vehicle was towed to an independent mechanic where the vehicle was repaired. The dealer nor the manufacturer have yet to be notified of the failure. The vehicle was repaired and sold. The failure mileage was approximately 15,500. |
| Category | Vehicle Speed Control |
| Date | Apr 22, 2021 |
| State | VT |
| Description | The vehicle has made "panic stops" at highway speeds 5 times when using adaptive cruise control with no input from driver or surrounding environment I. E.. Clear road, no traffic, sun or no sun. |
| Category | Service Brakes |
| Date | Apr 07, 2021 |
| State | AL |
| Description | Brakes squeak. Started about 3000 miles. I have complained to dealer several times. |
| Category | Service Brakes, Steering |
| Date | Mar 18, 2021 |
| State | OK |
| Description | My truck tuesday march 16th had me update software as soon as I got to work, after it was done I got out of my truck and it would not lock with push button or fob. When I got into my truck to go home 10hrs later it made a bunch of clicking noises and after a minute it showed update complete on screen then started. The very next day I drove back to work which is 22 miles. When I took my truck to lunch three blocks away I had esc service light and service parking brake accompanied by check engine light. I called local dealership to get it looked at and they said friday was as early as I could get it in. I left work early at 1:30 and tried to drive it and it was squalene like a bad power steering pump and shaking as I drove. I went ahead and took it the dealer. |
| Category | Forward Collision Avoidance: Automatic Emergency Braking, Service Brakes |
| Date | Mar 10, 2021 |
| State | GA |
| Description | 2020 gmc sierra slt vin:[xxx] 15,700 miles. Braking system failure at about 45mph on highway 78 in loganville, ga approaching an intersection with red light, vehicle seemed to loose all power braking. I stood with all I could on the pedal, and turned to avoid rear ending stopped vehicles, running into middle of the intersection before it stopped; no accident ! Dealer is replacing master cylinder and booster braking system, along with computer system upgrade. My concern is the dealership and nhtsa is aware of this issue, yet no cease and desist driving directive has been issued ! Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6). *tr |
| Category | Electrical System, Steering, Unknown Or Other |
| Date | Feb 25, 2021 |
| State | TX |
| Description | When stationary and preparing to start vehicle intermittently see "service steering column lock" message appears and disappear once vehicle is started. This was previously supposed to be addressed with service bulletin 20-na-21 however being told by service department that vehicle has all current updates applied a year ago, including the one that should of addressed the issue. Told that the vehicle history shows records of past "loss of communication to dic" but as they can't immediately reproduce no action was taken. |
| Category | Exterior Lighting, Unknown Or Other |
| Date | Feb 24, 2021 |
| State | TX |
| Description | Dangerous visibility hazard when backing up vehicle at night. Infotainment screen switches to "full brightness" when backup camera is activated, resulting in blinding light to driver. Driver can not backup safely without physically covering the screen to regain visibility. Screen brightness reflects off all 4 windows, windshield and back glass. Side mirrors are unusable in this condition. There was a fix for this issue on previous gm models, (prior to 2018), however no fix for 2019 - present |
| Category | Electrical System:adas:blindspot:sensors |
| Date | Feb 19, 2021 |
| State | PA |
| Description | Tl* the contact owns a 2020 gmc sierra 1500. The contact stated while driving, the side view mirror's blind spot alerts on both sides engaged with no vehicle nearby. The vehicle was taken to turner buick gmc (612 e main st, new holland, pa 17557) where the contact was informed that the sensors were dirty. The contact then washed the vehicle however, the failure recurred. The vehicle was not repaired. The manufacturer had not been informed of the failure. The failure mileage was approximately 400. The vin was not available. *bf |
| Category | Tires |
| Date | Feb 19, 2021 |
| State | NC |
| Description | Tl* the contact owns a 2020 gmc sierra 1500 equipped with bridgestone tires, tire line: alenza a/s 02, tires size: 275/50/r22, dot number: unknown. The contact stated that the tires failed to hold the tire pressure. The vehicle was taken to scenic chevrolet buick gmc cadillac (2300 rockford st, mt airy, nc 27030) where the vehicle was purchased. The technician added nitrogen gas into the tires however, the failure persisted. The contact stated that a letter was sent to the manufacturer however, there was no response. The failure mileage was 2,976. *js *js |
| Category | Steering |
| Date | Feb 17, 2021 |
| State | GA |
| Description | The steering will completely lock up, this is the 2nd occurrence. It was at the dealer 1143 miles ago and codes were cleared, problem reoccurred. I was able to start the vehicle, put in drive/reverse neutral etc without issues, however the steering was completely locked up and would not allow steering/control of the vehicle. The vehicle was parked in driveway, cold outside both times. I have video evidence. The first occurrence 12/26/2020 at 9591 miles, 2nd occurrence 2/16/2021 at 10733 miles (1142 miles later) |
| Category | Visibility/wiper |
| Date | Feb 15, 2021 |
| State | AR |
| Description | While driving on a state highway, I heard a "pop" sound, I saw nothing contact the vehicle, but I then noticed the windshield was cracked. The windshield cracked for no apparent reason.. |
| Category | Unknown Or Other |
| Date | Feb 14, 2021 |
| State | NV |
| Description | The screen on my truck has gone blank several times and the volume on the radio goes super load and the only way to stop it seems to be to stop and turn off the truck, open the doors and re start truck. Today, I couldn't get my screen to go off in my truck when I turned it off, I tried turning off, restarting etc but to no avail. I'm at work now and fear that the battery will go dead before I get off work. I just had the truck at gmc 2/6/2021 and was told that their were no recalls. Also, note that when the screen kept going out I took it to the dealer and they said they had to reflash/reprogram it which took 5 hours. |
| Category | Engine |
| Date | Feb 02, 2021 |
| State | ME |
| Description | At about 3500 miles lifters on two cylinders colasped. Took to dealer that dealer had three weeks but fixed it. 1500 miles later at 5036 miles it happened again on a different cylinder. Number 8. The first time it was 3 and 5. The first time the dealer replaced all 8 cylinders. So cylinder number 8 was new as well. Gmc has said there is nothing else that can be done to fix the issue. The second dealer service manager states that he would not trust it either to go any long distance . Also stated that they have put 3 sets in to one vehicle before. As an ase master certified technician I find this disturbing. I also was a gmc,pontiac, oldsmobile master technician. This is unexceptable for gm to think this is ok to take people's hard earn money and not fix there issues or make it right. I owned a 2014,2016,2018 silverado's that had no issues what so ever. To make things worst gmc road side assistance forgot about the truck broke down in 7 degree weather with 35 mile an hour winds. For over 24 hours and several calls back to finally get a supervisor to speak to. Two dealers say that it is unacceptable except the current dealer that is dealing directly with gmc. Anyone can do a search on gm truck lifters collapsing and you immediately overwhelmed with info. It is also disturbing that a dealership service manager says we could put a new engine in and the same thing could happen. That to me is poor quality control and poor customer service. I have always been a gm enthusiasts but this will be my last one. Horrible customer service and do not build a good product or stand behind it. Gm should be ashamed of there fall from grace. This all happened just driving once to work and once hauling a atv on a trailer. |
| Category | Service Brakes |
| Date | Feb 01, 2021 |
| State | CA |
| Description | Brakes since new squeeled. Took to dealer and dealer said it was normal. Have had the truck about 11 months now. Dealer stated gm now uses a different pad material and I would have to pay for it at a cost of close to |
| Category | Visibility/wiper |
| Date | Feb 01, 2021 |
| State | PA |
| Description | Wipers froze to windshield while driving with defroster on max. Design of the windshield and dash means wipers sit lower than where the dash and windshield meet, and no warm air from the defroster can get to the windshield where the wipers sit. There is no in window defroster (like rear window) which can help. Major safety issue in snow/ice conditions. |
| Category | Steering, Suspension, Wheels |
| Date | Jan 20, 2021 |
| State | UT |
| Description | The vehicle pulls to the right or left into oncoming traffic within 800 feet or sooner depending on speed. This occurs on city streets or interstate. Gm and gm approved dealerships say this is done to gm specifications. The first 7000 miles, it didn't pull. After gm shop aligned, and 3 months later, it is unsafe to operate. |
| Category | Engine, Forward Collision Avoidance: Warnings, Lane Departure: Assist |
| Date | Jan 14, 2021 |
| State | TX |
| Description | Within 3 months ( |
| Category | Electrical System, Steering |
| Date | Jan 13, 2021 |
| State | MI |
| Description | On december 14, 2020 my sierra with 2339 miles displayed, at startup, the power steering was out, to drive with care. Also displayed service esc and traction control failures. I drove with much difficulty, without power steering, ten miles to the nearest gmc dealership, lafontaine in highland, mi. I picked up the vehicle on december 29, 2020 with an additional 60 miles. The service personnel said they were unable to duplicate the problem, therefore no repairs were made. Lafontaine had contacted general motors tech center who offered no solutions other than checking the battery and wiring harness connections. The problem has not reappeared in the fifteen days since I picked up my vehicle. |
| Category | Electrical System |
| Date | Jan 08, 2021 |
| State | MO |
| Description | [xxx] information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6). *tr |
| Category | Engine, Forward Collision Avoidance: Adaptive Cruise Control, Forward Collision Avoidance: Automatic Emergency Braking |
| Date | Jan 02, 2021 |
| State | SC |
| Description | The engine failed at 5100 miles and is currently being repaired by the dealership. I requested a new car replacement. |
| Category | Power Train, Service Brakes |
| Date | Dec 30, 2020 |
| State | NJ |
| Description | Car was idling and parked. Warning code showed up on dashboard esc, electronic stability control, reduced engine power. Vehicle then displayed transmission disruption, warning light displayed as well. I was able to drive it to the dealership but the performance of the vehicle was limited by the reduced engine power. Transmission was hesitating and clunky during gear changes. My sierra has 5,000 miles on it and the transmission was already replaced at 2,000 miles. Gmc has a serious problem with this make and model. Unsure what the resolution will be, but I am no longer confident in the product gmc is selling. |
| Category | Air Bags |
| Date | Dec 29, 2020 |
| State | MO |
| Description | Tl* the contact owns a 2020 gmc sierra 1500. The contact stated that while driving approximately 35 mph the driver lost control of the vehicle and drove off the road and down an embankment before crashing to the ground. During the crash the vehicle sustained severe damage to the front end but the air bags did not deploy. The driver sustained head and shoulder injuries which required medical treatment. The vehicle was towed away. No police report was taken. The cause of the failure was not determined. The local dealer mayse earnhardt auto group located at 2032 s elliott ave, aurora, mo was notified of the failure. The manufacturer was not contacted. The failure mileage was 10,000. |
| Category | Electrical System, Service Brakes |
| Date | Dec 20, 2020 |
| State | LA |
| Description | On two separate occasions, the truck has been dead when attempting to crank. There were no lights or devices left on after the previous time the truck had been used. Something is drawing power from the battery causing it to be dead. After recharging the battery, the check engine codes read that there is a problem with 'brake light illumination.' help in determining wha t is causing the battery to die on such a new vehicle would greatly appreciated! I'm uncertain at this time as to whether or not the brake light illumination is causing a safety hazard. |
| Category | Engine |
| Date | Dec 16, 2020 |
| State | TX |
| Description | Knocking coming from engine - noticeable unnecessary noise in which dealer can not fix the problem |
| Category | Electrical System, Service Brakes |
| Date | Dec 10, 2020 |
| State | CA |
| Description | After having all sorts of warnings over time like "service esc," "service parking brake," and more, I now see "brake system failure: 62 mph top speed" flash across my dash. I am reading and hearing that this is a very dangerous problem. New truck. Brand new. Had it less than a year. Brake message always on start up. |
| Category | Electrical System |
| Date | Dec 09, 2020 |
| State | FL |
| Description | Went out to my vehicle that has been sitting in my driveway for 24 hours and attempted to unlock it with the key fob. Nothing. Tried the other fob. Nothing. Used the key to unlock the door and get in to push button start and nothing. I plugged both batteries into chargers and they would start to charge, then discharge after the batteries got up to about 20% I called gmc roadside assistance and they sent someone out. The service guy showed up about 45 min later and hooked up a jump box to each battery. Still no luck in getting it started. He said it must have some major electrical issues. Since we could not get it to shift to neutral, he could not tow it and I am now waiting for a tow in the morning. This truck has less than 10,000 miles on it. I'm dealing with this less than 5 months into ownership and this comes after I had to take it into service the second day of owning the vehicle because I had a def sensor crystallize and go bad. So, I owned the truck for less than 24 hrs and had to put it in the shop for a week. Now, it goes back. This is ridiculous for a ,000 truck that has less than 10k miles. |
| Category | Electrical System, Engine |
| Date | Dec 04, 2020 |
| State | NE |
| Description | There is no way to permanently disable the auto start stop on the vehicle. Several others have complained about this, no response from gm. There needs to be a firmware upgrade to the ecm to allow the owner make the decision on if that is enabled or disabled. On mine, I have to push a button each time I start the engine to disable that. Some gm vehicles don't have that option. |
| Category | Electrical System |
| Date | Nov 22, 2020 |
| State | OR |
| Description | Progressive pause starts when starting vehicle. After a few weeks of pause starting vehicle had no power at all. Towed it to dealer they replaced a bad battery. Pause start continued and after 4-5 weeks vehicle would not start. Couldn't turn park break off. There was power (lights in dash came one) but didn't start. Vehicle parked and only after sitting unused this happened both times. (1st time no start, hadn't driven for 3 days, end of summer weather) (2nd no start, sat overnight cool weather, but no freezing. Towed to dealer and they found nothing wrong. |
| Category | Engine |
| Date | Nov 20, 2020 |
| State | FL |
| Description | Tl* the contact owns a 2020 gmc sierra 1500. The contact stated that the vehicle push start button and key fob failed to start the vehicle on first attempt. The contact stated that the vehicle started after severals attempted. The contact stated the failure occurred intermittently. The check engine warning light illuminated. The contact stated that on his way to mckenzie buick-gmc dealer, 6500 caroline st, milton, fl 32570, the check engine warning light was not illuminated, the vehicle was diagnosed and the contact was informed that a failure code was not found. The vehicle was not repaired. However, the contact called back the same dealer and informed them that the failure recurred. The vehicle was not yet taken back to the dealer. The manufacturer was not made aware of the failure. The failure mileage was approximately 86. |
| Category | Electrical System, Seat Belts |
| Date | Nov 06, 2020 |
| State | OH |
| Description | Keep getting "service safety restraint system " alerts. Vehicle only has 550 miles. Alerts are intermitent when driving. Contacted the dealer and was advised that unless it remains on they could not trace the issue. |
| Category | Engine, Service Brakes |
| Date | Oct 29, 2020 |
| State | TN |
| Description | Two issues broken valve spring caused engine to shut down, second service brake, brake failure light, service esc, service trailer brake messages causing brake failure |
| Category | Engine |
| Date | Oct 08, 2020 |
| State | CA |
| Description | I noticed several spots of oil on my driveway, I then inspected the underside of the engine (l5p) and noticed oil dripping from several bolts and lines. My vehicle, a 2020 2500hd denali diesel, has only 2,200 miles on it from normal highway driving. |
| Category | Electrical System, Engine, Exterior Lighting |
| Date | Oct 02, 2020 |
| State | MI |
| Description | As I was driving home my check engine light came on and all of my lights went out. I had no tail lights and the radio started saying no signal detected. The dash screen was saying service keyless entry system. And I had no running lights but my headlights. Pretty scary thinking no one could see me as they were driving behind me at a high rate of speed. My truck only has 200 miles on it so this is really scary to be having issues so early in the ownership of this truck. I've always had fords but this truck caught my eye and I stepped out of my comfort zone and now wishing I would have stayed in in. |
| Category | Visibility/wiper |
| Date | Sep 30, 2020 |
| State | TX |
| Description | Back up camera is awful at night. This is a safety issue because you cannot see anything when backing up. My truck has 323 miles on it and I went to dealership they said I would have to live with it. That is not acceptable to have a safety feature that is faulty. |
| Category | Service Brakes |
| Date | Sep 28, 2020 |
| State | FL |
| Description | My brakes are squeaking very loudly they have been since august. I was driving down the road on us1 and prepared to stop to make a turn and my truck would not stop. I was making a right turn and ended up in the other lane of oncoming traffic sideways because I tried to turn my truck to slow it down. I complained about my brakes several times to the dealership they ordered me new brakes without even looking at my vehicle around august 8th. We are now at the last two days of september and they still do not know when the brakes will come in. This is a serious safety issue at this point. I have no other vehicle to drive. I bought a 70,000 truck and my and my family's safety is on the line. Gmc needs to find me a comparable loaner vehicle until my truck is repaired. |
| Category | Engine |
| Date | Sep 27, 2020 |
| State | VA |
| Description | Vehicle equipped with l87 6. 2l. At 197 miles engine suddenly ceased operating and would not restart. This occurred while stopped on private road. Vehicle had to be towed to dealership where they found p0300 and diagnosed broken #4 cylinder exhaust valve spring. |
| Category | Service Brakes |
| Date | Sep 24, 2020 |
| State | OH |
| Description | Tl* the contact owns a 2020 gmc sierra 2500. The contact stated that while driving and towing a trailer, she discovered that the brakes were overheating. There was a strong burning hot odor coming from the brakes. The contact pulled over and discovered all four brake rotors were extremely hot. The contact drove and dropped off the trailer. The contact drove 20 mph and down shifted to control the speed to get back home. The dealer dave arbogast buick-gmc (3540 s co road 25a, troy, oh 45373, (937) 335-0068) stated that incorrect brake pads were installed on the vehicle from the factory and there was a technical service bulletin for the failure. The vehicle was not repaired due to the replacement parts not being available. The manufacturer was contacted and promised to provide a callback. The failure mileage was 500. |
| Category | Electrical System, Service Brakes, Steering |
| Date | Sep 23, 2020 |
| State | CA |
| Description | Everything was fine for about 6 months after having purchased vehicle as new. Then I got warning lights asking me to both service the parking break and service esc with a warning that driving would be compromised just over 60mph. I notified dealer who says they fixed the glitch but it happened again. The last time, most recently, I tried to start the truck the next day and all the warning lights came on. This was followed by a complete shut down. No engine, no lights - not even lock/unlock with key fob. It had to be towed. This is a 2020 vehicle and seems like it will strand me some place at the very least. Awful, expensive, and perhaps deadly dynamics here. Gmc, get your act together. You owe us immediately. Provide the fix immediately or give me money back with no contest. |
| Category | Power Train |
| Date | Sep 23, 2020 |
| State | FL |
| Description | Transmission kicks when coming to a complete stop. |
| Category | Electrical System, Electronic Stability Control, Steering |
| Date | Sep 21, 2020 |
| State | AZ |
| Description | 2020 gmc sierra denali duramax 3000 miles tried turning on truck this morning to go to work and would not even crank it is a push start option have no clue on how im going to take it to the dealership if I cant get it of park into neutral for a tow truck at least ! Truck does not crank it throws me a ton of messages stability trak dsc abs power reduced 4wd check trailer lights. Bunch of messages I took video of it and so truck doesn't even try to start. I took a video or the problem |
| Category | Electrical System |
| Date | Sep 17, 2020 |
| State | WV |
| Description | Display is dangerously too bright when backing up cannot see to back up vehicle safely |
| Category | Electrical System |
| Date | Sep 14, 2020 |
| State | LA |
| Description | Vehicle does not start and flashing various codes service just about everything on the vehicle |
| Category | Electrical System |
| Date | Sep 04, 2020 |
| State | IL |
| Description | The night time backup camera is really bright and blurry and it makes it hard to see when backing at night |
| Category | Electronic Stability Control, Engine, Service Brakes |
| Date | Sep 04, 2020 |
| State | TX |
| Description | My 2020 gmc sierras brakes failed on may 22nd and ecm and now the engine and transmission are experiencing issues based on the onstar report. |
| Category | Electronic Stability Control, Engine, Steering |
| Date | Aug 29, 2020 |
| State | OK |
| Description | Parked truck for one hour, engine off. Came back and upon startup, received multiple errors that power steering and esc required dealer attention. Brake pedal would depress to floor. Gmc sierra 1500 elevation trim |
| Category | Electrical System, Service Brakes |
| Date | Aug 28, 2020 |
| State | NJ |
| Description | Electronic abs brake failure with 73 miles on odometer while stopped at red light alarm chimes sounded and power brakes were lost. Warning lights on dash abs brake failure multiple engine warning lights came on. Dealer service was puzzled needed to contact gm technical support. Final outcome they are replacing the electronic brake module. |
| Category | Electrical System, Power Train |
| Date | Aug 12, 2020 |
| State | TX |
| Description | At 550 miles had to tow to dealer. They said needed to reprogram transmission. Now at 4000 miles, went to start and vehicle will not do anything. No power. It is being towed to dealer again. Pretty much bought a lemon as it looks now. |
| Category | Steering |
| Date | Aug 12, 2020 |
| State | FL |
| Description | Tl* the contact owns a 2020 gmc sierra 1500. The contact stated that the vehicle was at a stand still in a hospital parking lot, when the steering wheel ceased. The contact stated that the power steering assist warning light was illuminated. The vehicle was not drivable. The vehicle was towed to local dealer phillips buick gmc located at 2160 us-441 #27, fruitland park, fl 34731, (352) 728-1212, however the mechanic was unable to duplicate the failure. The vehicle had not been repaired as of yet. The manufacturer had not been informed of failure. The failure mileage was 1,000. The vin was not available. |
| Category | Electrical System |
| Date | Jul 30, 2020 |
| State | TX |
| Description | Battery was dead in the garage. Called road side assistance who jump-started car. Car would not go into gear. We rolled it out into driveway where it sat for 24 hours. When it was loaded for travel to dealership, it cranked and was driven up on wrecker trailer like it had no apparent problems. Was carried to dealership where they recharged and checked the battery and reset 14 different codes which were lost with the low voltage. |
| Category | Unknown Or Other |
| Date | Jul 29, 2020 |
| State | MO |
| Description | Part #19419266 tonneau was installed 07/16/2020 and leaks terrible in the rain |
| Category | Unknown Or Other |
| Date | Jul 23, 2020 |
| State | SD |
| Description | While towing a fifth wheel camper, the exhaust was so hot it melted the camper directly behind it. Was caught in side mirror before anything caught on fire. |
| Category | Electrical System |
| Date | Jul 19, 2020 |
| State | OH |
| Description | Brand new truck purchased in may 2020. Vehicle would not start on 7/2/2020 and a new battery was placed in the vehicle. The truck would not start again on 7/17/2020 unknown reasons... |
| Category | Unknown Or Other |
| Date | Jul 15, 2020 |
| State | TX |
| Description | After vehicle sits idle for a while, the vehicle makes a high pitch whistling sound on startup that last for approximately minute of driving. |
| Category | Steering |
| Date | Jul 14, 2020 |
| State | FL |
| Description | 2020 gmc sierra steering issues. Loss of communication between modules. Results in locked steering or no power steering assist. Happens randomly at vehicle start up. Been to the dealer four times so far. The first two was informed there's nothing wrong with it. Repairs attempted, update software, engine harness repair, and steering module replacement. |
| Category | Equipment:electrical:navigational System(global Positioning System), Unknown Or Other |
| Date | Jun 24, 2020 |
| State | WA |
| Description | Navigation states to turn right when it should be left or vice versa. This was a problem on the 2016-2017 models also. *tr |
| Category | Unknown Or Other |
| Date | Jun 22, 2020 |
| State | NJ |
| Description | The front park assist sensors on this truck do not operate as intended, or as on prior years or as on other vehicles. The sensors did not pick up parking bollards in front of a convenience store and resulted in a minor ding that cost over 00 to repair. When bumper was repaired the service person said sensors were fixed, yet, to his surprise, we were able to inch up to a car directly intersecting the front of the car and it did not pick it up. I did a similar test with a brand new/unsold vehicle on dealer lot ind it failed to sense the large truck directly in front of it. This I believe can be a very dangerous safety issue as the truck hood sits very high impeding viability and a small person or pet can easily go undetected. These vehicles has also had numerous recalls including one for the possibility of the hood flying open while operating. I have sold the truck as all of these issues have devalued the vehicle, it remains unsafe and gm response has been less than favorable. |
| Category | Service Brakes, Steering |
| Date | Jun 17, 2020 |
| State | NM |
| Description | Tl* the contact owns a 2020 gmc sierra. The contact stated that while driving at 25 mph, the system brake failure warning message illuminated on the instrument panel. Once the warning light illuminated, the contact experienced complete brake and steering failure. The contact was able to steer the vehicle into a curb to slow down the vehicle and avoid a possible collision with another vehicle. The contact stated that he had suffered pain to his left shoulder blade and left knee; however, he did not seek medical attention due to covid-19. After experiencing the failure, the contact had the vehicle towed to desert sun motors, inc. (2600 n white sands blvd, alamogordo, nm 88310) where they cleared the system's computer and informed the contact that they found no defects with the vehicle. Upon return of the vehicle, he experienced another brake failure as the check engine light illuminated while driving at 55 mph. Due to the failure, the contact was forced to run a red light and drive up an incline in order to bring the vehicle to a complete stop. The vehicle was then towed shamaley buick gmc (955 crockett st, el paso, tx 79922) where it remained in their possession. The manufacturer was notified of the failure and a field inspector was sent to inspect the vehicle. The contact stated that know brake failure codes were detected. The contact stated after the third failure the vehicle was towed to shamaley gmc where it was awaiting diagnosis. The vehicle had yet to be repaired. The failure mileage was unknown. |
| Category | Electronic Stability Control, Service Brakes, Suspension |
| Date | Jun 14, 2020 |
| State | AL |
| Description | Highway driving engine light started flashing, received codes on service esc and service parking brake. Truck seemed to loose power transmission started shifting very hard, cruse disengaged,lane keep assist stopped working , brakes and steering seemed to act different . When ignition was turned off loud noises from under truck sounded like brakes releasing with loud clunking noise. |
| Category | Engine |
| Date | May 27, 2020 |
| State | PA |
| Description | Ruptured oil cooler line. Draining the engine of oil and causing lock-up. *tr |
| Category | Unknown Or Other |
| Date | May 26, 2020 |
| State | WI |
| Description | Can not see anything backing up in the dark because of backup camera. The picture on the screen is grainy and washed out so all you see are blobs of nothing. *tr |
| Category | Engine |
| Date | May 20, 2020 |
| State | SD |
| Description | Tl* the contact owns a 2020 gmc sierra 2500. The contact stated that while driving, he noticed smoke entering the vehicle through the air vents. The contact coasted to the side of the road, exited the vehicle safely with his passenger, upon opening the hood noticed that the whole engine compartment was on fire. The contact stated that the fire department arrived but was unable to extinguish the flames as they allowed the vehicle to burn until the fire self extinguished. The dealer nor the manufacturer was made aware of the failure. The failure mileage was approximately 2,800. Vin was not available. |
| Category | Engine |
| Date | May 10, 2020 |
| State | TX |
| Description | Engine like keeps coming on. Code reading the knock sensor needs to be repair. Sensor has been replace twice in the past three months. *tr |
| Category | Electrical System |
| Date | Apr 30, 2020 |
| State | NY |
| Description | Review camera is extremely bright when backing. It's so bright that a glare is thrown onto rear window making it next to impossible to see out rear window or use side view mirrors. I often revert to to open drivers door and looking backwards that way. Someone is going to get run over as you cannot see where you are backing. Very dangerous! |
| Category | Service Brakes |
| Date | Mar 04, 2020 |
| State | CA |
| Description | The abs system failed while driving down the road causing the brakes to lock up and caused the truck to spin out of control nearly crashing into another vehicle and jumping over the center divide into oncoming traffic. |
| Category | Electronic Stability Control, Service Brakes, Steering |
| Date | Feb 23, 2020 |
| State | AZ |
| Description | I was going about 15 miles per hour when suddenly all these error codes started popping up, first "esc malfunction" then trailer brake malfunction,stabilitrak, steering assist reduced, brake system fail, lighs just pop up I do feel like the truck looses some power feels more sluggish, I took it to dealership, they recalibrated the break system and stuff, it fixed the issue temporarily, but the lights keep coming back, sometimes I turn the truck on in the morning and lights are gone, then later on I get all the error codes again while driving it. It started 4 days after I purchased the truck and happens daily since. |
| Category | Service Brakes |
| Date | Feb 19, 2020 |
| State | KS |
| Description | 2020 gmc 6. 2 l v8 1500 4w sierra denali. Bought yesterday new from dealership. Today, not even 120 miles and brakes malfunctioned. I started truck with gmc app. Got in car with my family and as I pulled out of parking stall pushing on brakes met extreme resistance and sluggishly came to a stop. I put truck in park. Shut off and turned back on. Brakes still not functioning. 'brakes' 'abs' and icons for traction control and check engine lights were on. Again attempted to drive. Driving 20 mph would take greater than 50 yards to stop, with me, 220# athletic male applying full force. Warning message also appeared 'brake system failure max speed 62 mph'. No idea where 62 was formulated. Also some message about trailer brakes came on too. No trailer was attached. I shut truck off. 30 minutes later started, check engine light was only light on. Brakes worked normal. Was able to cautiously get 3 miles home. This is a potentially fatal flaw. Again this truck is straight off the dealers lot. Onstar sent email stating 'issue with antilock braking system, take to dealership within 7 days '. So brake failure is a major issue. But also a known brake issue and the computers say stay below 62 mph and get serviced within 7 days are just as worrisome. A braking issue should instruct don't drive and have towed thanks |
| Category | Electrical System, Engine |
| Date | Feb 17, 2020 |
| State | PA |
| Description | Smell of smoke strong in the cab and outside hood of truck. Also have seen smoke coming from hood of truck. Smells like burning electrical or plastic |
| Category | Service Brakes |
| Date | Feb 14, 2020 |
| State | NC |
| Description | Vehicle was parked. Entered vehicle and turned on vehicle using interior start button. Vehicle was put in reverse and was baking when all break pressure disappeared and vehicle was rolling backward and came to a stop before striking another vehicle and child. Vehicle was placed in park and esc failure, trailer brake failure, traction control failure, power steering failure and do not drive above 62 mhp alarmed on the dash. Vehicle was shut off and on 3 times and reset finally regained some break pressure but check engine light came n. Vehicle was towed to trent gmc, new bern nc for service. Service told us it had a recall. I was unable to locate a recall for this issue. This could have ended very bad. I am not assured that the problem is fixed. |
| Category | Electrical System, Exterior Lighting, Unknown Or Other |
| Date | Feb 10, 2020 |
| State | AZ |
| Description | Brand new truck. Stuck at the gym in the middle of the night truck wont start. The interior lights, head lights, and radio wont shut off. Vehicle wont start. I'm assuming the battery was drained because interior lights, exterior lights, radio, wont shut off. Has to be some kind of electrical malfunction. Waiting on gm roadside. |
| Category | Power Train |
| Date | Feb 05, 2020 |
| State | NY |
| Description | The truck randomly gets stuck in park. Cannot put it into drive, neutral or reverse. The car has been at the dealership since january 27, 2020. Gmc wont send them the part, the dealship believes it must be a problem with the part and they are trying to fix or redesign the part before its sent out. Also I was told by my dealership another 2020 at4 came in with the same problem. It was towed to them. |
| Category | Service Brakes |
| Date | Jan 24, 2020 |
| State | SC |
| Description | Tl* the contact owns a 2020 gmc sierra 1500. The contact stated that while driving at 52 mph, the brake pedal was depressed but was very firm. The park brake was activated but failed to effectively stop the vehicle. The vehicle was coasted to a parking lot and was put in park. The brake system failure light, the abs and several other warning lights illuminated. The vehicle was towed to the baker buick gmc of charleston dealer, located at 1621 savannah hwy, charleston, sc 29407) where the vehicle was kept for a diagnostic test. The manufacturer was made aware of the failure and stated that the failure was a known issue and referred the contact to the dealer. The vehicle was not repaired. The failure mileage was approximately 7,020. The vin was not available. |
| Category | Unknown Or Other |
| Date | Jan 21, 2020 |
| State | LA |
| Description | The backup camera is entirely too bright at night. It is nearly impossible to see the mirrors due to the brightness |
| Category | Exterior Lighting |
| Date | Dec 15, 2019 |
| State | IN |
| Description | When making right turns in the dark the headlights do not cast light to the right so you can see where you are turning. This is especially a problem in the rural without streetlights it is totally black from the drivers seat looking over the right side of the hood or out the right window. |
| Category | Steering |
| Date | Dec 12, 2019 |
| State | CO |
| Description | Vehicle exhibits steering wheel shake / shimmy at speeds above 50mph, sometimes severe. Repeated attempts at repair (currently 4 dealer visits), including application of service bulletin 19-na-240 does not correct the problem. Gm has now indicated this is a "normal" condition, and will not authorize further warranty reimbursable labor for correction to dealer. This steering condition affects safety as it occurs in varying severity and with no warning, especially during driving over rough pavement / bumps, and has nearly lead to a loss of control of the truck. This condition was present at delivery of truck at 221 miles. Truck currently has 1688 miles. |
| Category | Service Brakes, Traction Control System |
| Date | Nov 27, 2019 |
| State | GA |
| Description | Tl* the contact owns a 2020 gmc sierra 2500. While driving 5 mph, the brakes engaged automatically and the traction control warning indicator illuminated. The vehicle was taken several times to carl black chevrolet buick gmc (located at 1110 roberts boulevard northwest, kennesaw, ga 30144, (888) 457-2417). The dealer diagnosed that the speed sensor needed to be replaced. The vehicle was repaired, but the failure continued. The dealer diagnosed the vehicle again and stated that the wheel hubs needed to be replaced. The vehicle was repaired, but the failure recurred. The dealer diagnosed the vehicle a third time and stated that an unknown steering angle sensor needed to be updated. The vehicle was repaired, but the failure continued. The manufacturer was informed of the failure. The failure mileage was 571. |
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Brian Jones spent more than 20 years working as an ASE Certified Master Tech and Parts Specialist at multiple dealerships. Brian has become an authority in the industry, traveling across the country to consult for car dealerships and contributing his expertise as a writer for several major automotive publications. In his spare time, Brian enjoys working on pickup trucks, muscle cars, Jeeps and anything related to motorsports.
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