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Getting a job done right shouldn’t mean driving grandpa’s truck. With the 2021 GMC Sierra, customers are provided a little bit of luxury with the hard-working capability of a pickup. The automaker claims “command meets comfort” with this model, but customers aren’t impressed. This GMC appears to struggle with the steering, seats, engine and powertrain, leaving owners confused about what they have paid more for.
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NHTSA Complaints for the 2021 GMC Sierra
| Complaint Category | Number of Complaints |
|---|---|
| Engine | |
| Electrical System | |
| Service Brakes | |
| Steering | |
| Power Train | |
| Fuel/propulsion System | |
| Air Bags | |
| Unknown Or Other | |
| Structure:body | |
| Seat Belts |
Click on other model year to view more problems: 2018 2019 2020
Problems with the Steering and Seats
When it comes to controlling a vehicle, steering is everything. However, it’s even more important when driving a pickup truck that’s towing or hauling heavy items. Yet, this Sierra seems to fail.
Read this NHTSA complaint. “Started vehicle everything was normal, shifted vehicle into drive, proceeded forward. While driving, vehicle’s steering seized. I was unable to move the steering wheel. It was also very difficult to stop the vehicle, brakes were not working properly. Messages came up on [the] display, reading Service Power Steering and brief message about the brakes flashed quickly on the message board. At that point, turned the vehicle off after I got it stopped, turned it back on, same messages. Still unable to turn the steering wheel, repeated this several times. Approximately for fourth time, the message cleared and the vehicle was back to normal. This occurred on a city street.”
When a vehicle becomes uncontrollable, it is scary. However, the steering is only one system that keeps this truck under control. It must also be equipped with reliable, durable tires. Yet, NHTSA Campaign Number 20V684000 shows that’s not true. This recall says certain vehicles have overcured tires installed, which might lead to a break in the sidewall, creating sudden air loss, plus belt edge separation. All of these problems increase the chance of an accident, leaving customers feeling uneasy. While the GMC Sierra might exhibit command, there’s no comfort when the threat of an accident is always looming.
One key aspect of in-vehicle comfort is the seats, but this is another part of the truck that can’t seem to live up to expectations.
Another NHTSA complaint states, “Reached for a fallen object between the driver and middle front seat and there is a razor sharp piece that took a large chunk out of the hand which caused heavy bleeding and medical supplies to stop. The vehicle was stopped and just tried to retrieve fallen object between the seats. The incredibly sharp parts need to be cut or removed from this and other similar vehicles or covered with something. It was bare metal exposed out with sharp edges that cut the right hand so badly.”
It turns out that GMC might not have enough experience working with seats and seat belt construction. NHTSA Campaign Number 20V811000 says that incorrect bolts were used to attach the seat belts to the seat. If an accident occurs, the seat belts might not restrain passengers correctly, which could lead to larger injuries. However, the problem gets even larger when looking at NHTSA Campaign Number 20V792000. This recall states that the front center seat-belt bracket might not be secured correctly, causing a failure in restraining that passenger as well. This problem is apparent in more than 600,000 vehicles, leaving many people at-risk. If GMC was in “command,” these types of defects would never occur.
Problems with the Engine
The engine of a truck is what creates the power needed to haul and tow. With GMC, the engine simply wasn’t created to handle all of the jobs customers have.
Here’s one example of problems from the NHTSA website. “The vehicle was bought brand new and was only driven for a week. It was in motion on the freeway when the engine started to sound noisier than usual, like that of an older truck. It was hard to notice on higher speeds on the freeway, but upon slowing down on curves, it got more obvious that something was really wrong because the noise sounded like something was loose inside the engine. There was no ‘Check Engine Light’ or any other warning lights. Upon exiting the freeway, the engine shut off completely while in motion. Fortunately, I was able to pull in a parking lot and park it safely. The engine would not start safely after that, and ‘Check Engine’ activated. The vehicle is currently being diagnosed at a dealership. Last update was that the engine was being taken apart completely because they said it’s definitely inside it.”
Who wants to drive a rugged and tough truck with a failing engine? Not most customers willing to spend money on the GMC model. Even the automaker knows how many problems this engine is causing. Service Bulletin #N202319660 discusses a broken engine valve spring that leaves the motor running rough. It can also cause the Check Engine Light to come on, create a knocking or ticking noise and lead to stalling concerns. Surely there are better ways to haul goods than with this truck. At this point, even the back of a camel would be more reliable.
Problems with the Powertrain
Working in conjunction with the engine is the transmission. This part is required to provide a smooth-shifting drive, but the GMC Sierra seems to be equipped with faulty parts.
One Edmunds user states, “Bought a 2021 AT4 with 3.0L Duramax. Ordered it and waited 4 months for it to arrive. Love the ride & engine. Had to be towed to dealer with 1,236 miles due to a “transmission module issue.” Been 3 days haven’t heard back. Think transmission might’ve blown. Wouldn’t go in reverse, would go into reverse position but wouldn’t move. Engine power was reduced & check engine light came on. The 10 speed transmission was supposed to be solid…. be cautious.”
Again, these problems are not a mystery to GMC. Service Bulletin #16NA019 discusses how the transmission leads to harsh shifts, flares and slips, making any ride less enjoyable. With all of the problems bundled together, it’s clear that the Sierra can’t provide command nor comfort.
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Complaint Data
| Category | Service Brakes |
| Date | Mar 10, 2023 |
| State | FL |
| Description | I bought a loaner 2021 gm sierra 1500 in aug. 2021 from starling buick gmc, venice, fl with 1600 miles on it. I used the sierra to move items from my houses in my trailer from both fl to pa and pa to fl. On each trip the trailer brake controller would go out while driving. The first time it occurred was on a trip from fl to pa, during this trip it happened at least four times. Upon arrival in pa I took it to kelly buick gmc in allentown, pa. They looked over the vehicle, saw there were codes in history indicating an issue with the trailer brake system but could not replicate it or pinpoint what part of the system was faulty. The dealer told me that gm will not fix it if it is in history only if it is currently giving a code. On the return trip back to fl from pa, same thing several times it occurred, took it back to the selling dealer starling, and they gave me the same speech as kelly , can't fix it without a current code. Next trip from fl to pa, same thing took it to kelly again, same response. Back to fl from pa, same thing, starling gave me the same response, they can't and won't do anything. I told starling service rep I guess I need to die before you do anything, she was completely indifferent to my comment and backed gm without any regard for my safety. It is sporadic and inconsistent and obviously only occurs when there is a trailer attached. They said it was my trailer so I took it to a trailer mechanic, we tested it on its own and on another vehicle with no problem. The brake controller failed while hauling a trailer potentially allowing a serious if not deadly accident with improper braking capabilities. Even though two dealers in two different states acknowledge there is an issue they refuse to correct it because they can not replicate it. The brake controller lights would go out as you're driving indicating the brake controller is not connected to the trailer and providing a supplemental braking system. 2022 and 2023 have this issue. |
| Category | Electrical System, Engine, Fuel/propulsion System |
| Date | Feb 23, 2023 |
| State | MO |
| Description | Less than 5 minutes after my husband and 2 children parked the car and came inside, a neighbor walking rang our doorbell to let us know there was something on fire in our driveway. We ran to the back to find his truck engulfed in flames coming from the engine. We quickly called 911 and exited the house/property. The truck continued to burn with 20-25 foot flames and very black smoke for about 40 minutes until the fire department was able to control the fire. The fire was hot enough that the entire engine was significantly burnt, the seats and steering wheel were gone, the glass shattered and melted, and the tires exploded and melted. Thankfully, everyone was out of harms way and safe through this incident. However, it has been extremely traumatic on my family and neighbors and has taken a lot of time and energy to try to deal with this. The car sat in our driveway for over 2 weeks with a very potent smell causing headaches until gm and our insurance finally investigated. There is damage to our siding, driveway, landscaping, basketball hoop, trampoline, and neighbors fence. The car was only 2 years old and scares me how quickly it went up in flames and how much worse this could have been either 3 minutes earlier or if it was parked in our garage. |
| Category | Air Bags, Seat Belts |
| Date | Jan 18, 2023 |
| State | GA |
| Description | I get a "service safety restraint system" warning sporadically when driving. No known cause and the vehicle has never been in an accident. This started happening after my last service at capital buick gmc in smyrna, ga on january 6th, 2023. |
| Category | Engine |
| Date | Jan 15, 2023 |
| State | WV |
| Description | 2021 gmc sierra 1500 at4 6. 2l engine, little over 39000 miles, purchesed may 2021. This is the second time the vehicle has had this issue. The first time was aprox 15000 miles. I reported the issue to nhtsa-odi on 6 dec 2021 tracking # 11442943. I was driving down the interstate I heard a rattling coming from the engine (same as I had heard with the first issue). The check engine came on I ask on star to do a digonsotic report (see attached report). The report indicated a fuel management system issue detected advised to reduce vehicle speed and pay load as possible. I was told by gm certified mechanics that this issue could cause the engine to lock up and come to a complete stop on the roadway. I fill that these vehicle are unsafe to operate under these conditions and may cause serious accidents. Gm has known about these issues with these vehicles for several years and has failed to correct the problem. |
| Category | Electrical System, Electrical System:instrument Panel:speedometer/odometer |
| Date | Jan 11, 2023 |
| State | FL |
| Description | The contact owns a 2021 gmc sierra 1500. The contact stated while driving at various speeds with the onstar/gps, turn-by-turn driving directions activated, there was an unknown notification flashing on the instrument panel and radio. The speedometer was obstructed and failed to work as needed. The screen sporadically went blank. While depressing the dismiss button on the steering wheel, the button failed to correct the failure. There were no warning lights illuminated. The vehicle was taken to the local dealer and the system was rebooted; however, the failure recurred. The vehicle was taken back to the local dealer and the contact was informed to turn off the vehicle, open the door, and then restart the vehicle to reboot the vehicle. The vehicle was taken to another local dealer, bill cramer chevrolet buick gmc (2251 w 23rd st, panama city, fl 32405) but the vehicle was not diagnosed or repaired. The manufacturer was contacted but no additional assistance was provided. The failure mileage was approximately 10,450. |
| Category | Electrical System |
| Date | Jan 02, 2023 |
| State | FL |
| Description | My truck's battery is dead after sitting for a few days. There is a manufacturing deficit causing parasitic draw. This is a safety issue because it leaves us stranded after parking the vehicle for a few days. The general motors dealership refuses to do it anything about it. They claim it's normal. |
| Category | Exterior Lighting |
| Date | Jan 02, 2023 |
| State | NV |
| Description | During winter/snow driving snow accumulates on the headlights and causes a partial to total loss of visibility. This has happened multiple times during winter months. Cleaning the headlights requires exiting the vehicle in a potentially dangerous situation. This may occur after every few miles or less depending on the conditions. |
| Category | Engine, Fuel/propulsion System |
| Date | Dec 16, 2022 |
| State | MI |
| Description | 15000 miles lifter failure in traffic highway at speed 70 mph lost power engine failed multilane highway rush hour traffic no warning failure |
| Category | Unknown Or Other |
| Date | Dec 15, 2022 |
| State | FL |
| Description | I have a 2021 gc sierra 1500, the guidance lines in the display when in reverse go from non-existent to barely visible and are not usable especially in sunlight. The service man at miller chevrolet in marianna fla says gmc is aware of the problem, that it was caused by the last update download and will be fixed by another download to correct the problem. He also says the same issue is nationwide and all trucks have the issue which I find hard to believe. 1. If that were true it would be a simple matter of a few lines of code to correct the problem. 2. I have been chasing this problem since october and have now made four trips to the dealership. 3. I cannot believe all trucks have this issue and also I suspect the same backup system is in all gmc vehicles regardless of type. 4. I cannot believe gmc would allow such a problem to exist since the last update download which was months ago. 5. I contacted gmc customer care in october after the dealership told me they had no idea what was causing the issue. I have had a case number [xxx] since that time. I was told on the first call that if necessary a tech would be sent to fix the problem. Today I called asking for a tech to be sent only to be told I had to take it to another dealership and try them before a tech could be sent! I have two questions, can you help with this and does this qualify as a "lemon law" case? Any assistance would be greatly appreciated. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6). |
| Category | Service Brakes |
| Date | Dec 13, 2022 |
| State | VT |
| Description | All 4 brake rotors are warped according to my local gmc dealership. They also told me all of the inside brake pads are worn twice as much as the outer pads, which in my opinion indicates a manufacturing and/or computer controller issue. Safety is an issue when the inside brake pad wears down to metal while the outers are still over 75% of new thickness. Gmc dealer told me they're seeing this on countless sierra trucks made in the past few years but there is no recall and gmc will not cover it under warranty. First symptom was slight pulsing while braking downhill. 2-3 weeks later my brake pad wear indicator read 82% front, 88% rear. The following day it gave me an error message saying "service brake monitor" so I took it to my gmc dealer which is when they told me my brake pads and rotors all need to be replaced but the truck only had 22800 miles on it at that time. They said it could still be driven and pass inspection. Since then I have contacted gmc about them covering it and I have not made any progress. Gmc has had numerous brake issues resulting in recalls in the past 3-6 years but unfortunately this particular issue has not yet reached recall status. I hope this gets resolved before I am forced to pay for brake replacements out of pocket, which nobody should have to do on a vehicle with so little miles on it. The work order invoice I uploaded indicates ""pads at wear limit, both front and rear" but it does not specify what the technician and service advisor told me regarding only the inside pads are worn. However I do have a recording of the service advisor telling me that if needed. You'll also notice that I uploaded a copy of the state inspection done by them that same day which indicates my brake system passed the requirements. Please help. |
| Category | Fuel System, Diesel, Fuel/propulsion System |
| Date | Nov 25, 2022 |
| State | AZ |
| Description | Within 100 miles after purchasing this truck from gmc (used with 74k miles)I got messages both on my phone and later through inspection at gmc service center that the def system had a problem. The check engine light came on then off as well. I was getting messages saying I only had so many miles before the def system needed more fluid even though the tank was full or near full. The dealer here in tucson indicated there was a bulletin on this problem and ordered parts for the repair. I was informed it was not a recall and I would have to pay over 0. 00 for this repair. To date the dealer has had my truck for 2 weeks. Additionally, another message said insufficient coolant flow so they are installing a new coolant pump to be paid for by an after market warranty which I purchased at the time I bought the truck. This repair is over 00. 00 |
| Category | Service Brakes |
| Date | Nov 10, 2022 |
| State | PA |
| Description | The contact owns a 2021 gmc sierra 1500. The contact stated that the grandson was driving in stop-and-go traffic, the braking system suddenly malfunctioned causing the vehicle to crash into the rear of a second vehicle. The grandson was driving approximately 10 mph when suddenly while pressing the brake pedal to stop the message "brake failure" displayed before the vehicle crashed into the rear of the second vehicle. During the crash, no injuries were reported and a police report was taken at the scene. The vehicle was taken to the local dealer who replaced the master cylinder and brake booster and the failure was remedied. The failure mileage was 21,539 |
| Category | Service Brakes |
| Date | Nov 02, 2022 |
| State | TN |
| Description | The contact owns a 2021 gmc sierra 2500. The contact stated while approaching a stop sign and depressing the brake pedal, the brakes were squeaking. The vehicle was taken to the dealer and the contact was informed that the brake pads needed to be replaced. The brakes on the vehicle were replaced but the failure reoccurred. The vehicle was taken to another dealer and the caliper on the front driver's side was replaced and the failure reoccurred. The vehicle was taken to another dealer who was aware of the issue however, there was no recall for the failure. The manufacturer was not contacted. The failure mileage was 800. |
| Category | Electrical System, Electrical System: Instrument Cluster/panel, Engine |
| Date | Oct 27, 2022 |
| State | HI |
| Description | The contact owns a 2021 gmc sierra 1500. The contact stated that while operating the vehicle, the dashboard gauges, instrument cluster, and infotainment center malfunctioned and became inoperable. Additionally, while starting the vehicle, there was a loud cranking sound coming from the engine compartment and the vehicle would not immediately start. The vehicle was taken to the local dealer, but the cause of the failure was not yet determined. The manufacturer was notified of the failure, but no assistance was offered. The failure mileage was 100. |
| Category | Engine |
| Date | Oct 19, 2022 |
| State | GA |
| Description | The contact owns a 2021 gmc sierra 1500. The contact stated that while driving at an undisclosed speed, the vehicle went into limp mode with the check engine, def tank, and emission warning lights illuminated. The vehicle was taken to the dealer, and the dealer replaced several unknown sensors; however, the failure recurred. The dealer determined that the computer needed to be replaced. The vehicle was not repaired. The manufacturer was made aware of the failure. The failure mileage was approximately 35,000. |
| Category | Structure:body:tailgate |
| Date | Oct 03, 2022 |
| State | GA |
| Description | The contact owns a 2021 gmc sierra 1500. The contact stated that after parking the vehicle, it was discovered that the electronic multifunction tailgate had erroneously opened. Also, during the failure the tailgate struck a scooter lift that was attached to the vehicle. Both the tailgate and the scooter lift were damaged. The contact indicated that the failure had occurred on multiple occasions. The vehicle was taken to the local dealer who was unable to determine the cause of the failure and the vehicle was not repaired. The manufacturer was also notified of the failure. The contact was concerned that if a heavy load was being carried at the time of the failure it might have fallen onto a busy freeway. The failure mileage was 6,000. |
| Category | Unknown Or Other, Visibility/wiper |
| Date | Sep 24, 2022 |
| State | CA |
| Description | The driver-side mirror on my 2021 gmc sierra is unusable at freeway speed. When traveling at freeway speed the glass moves due to wind and causes the reflection in the mirror to be blurry. The reflection from the mirror is blurry to the point that I'm unable to identify objects in the mirror and it is difficult to gauge size and closing speed of any objects in the mirror. The issue has been with the vehicle since I purchased it new in june of 2021. The issue has been reproduced by two different dealership service centers and the entire driver-side mirror assembly has be replaced twice with the issue persisting. I have videos showing the issue but they are too large of files to upload on this form. |
| Category | Service Brakes, Steering |
| Date | Sep 19, 2022 |
| State | CA |
| Description | I start my car and I went to pull off and the steering wheel locked up and I couldn't turn it and it was just stuck going to sit power steering ec something. And then came home parked the car few days later try driving it and then the abs brake light came on warning me not to go over 65 mph and my brakes pad feel really loose now. |
| Category | Back Over Prevention: Sensing System: Camera |
| Date | Aug 26, 2022 |
| State | WI |
| Description | The contact owns a 2021 gmc sierra 1500. The contact stated that he had received an unknown manufacturer recall notification related to the back over prevention camera. The vehicle was taken to the dealer and the recall repair was performed. Upon return of the vehicle, the grid pattern on the camera was very dim and was not visible to the contact while in use. The vehicle was taken back to the dealer where he was informed that the recall was performed correctly and that no further repair could be performed. The manufacturer was notified of the failure and a case was filed. The contact was then referred to bob clapper automotive (3601 e milwaukee st, janesville, wi 535460) for further assistance. The vehicle was taken to the dealer; however, the dealer offered no further assistance. The dealer provided the same information as the original dealer. The vehicle was not repaired. The failure mileage was 7,000. |
| Category | Lane Departure: Blind Spot Detection, Steering, Suspension |
| Date | Aug 18, 2022 |
| State | TX |
| Description | I took my truck to the dealership because of my issues and they said they had many trucks going in with the same issue but there was no fix to it. The issues popping noise heard on hard turns and/or going over speed bumps, creaking noise while turning wheel left and/or right, clicking noise heard on slow sharp turns. Also when you go over a bump the truck makes a spring loud noise to the point that the whole truck bounces. Shifter is also very hard when you try to change gears. |
| Category | Air Bags, Seat Belts |
| Date | Aug 09, 2022 |
| State | TX |
| Description | The “service safety restraint†alarm goes off continually on my 2021 gmc sierra 2500hd at4. The warranty is no longer valid as at the time of occurrence I was at 34,500 miles and when I took it in the warranty had expired due to exceeding 36,000 miles. Extended warranties were not purchased and this began approximately 8-9 months after purchase. The code given is “b0014 driver seat side air bag deployment loop†with a description of high resistance in wiring or wiring harness. After much research I have found that many gmc 2021 vehicles and previous models have had this exact same issue. No dealership as of yet has offered to help or understand that this defect was of their own flawed design. The issue that I am having is exactly the same as other models such as the 2021 yukon, sierra 1500, suburban and others. This is a safety issue and only want gmc to account for their flaw. I do not believe I should have to pay for a design flaw or equipment malfunction that is well known amongst gmc vehicles. I am asking the nhtsa to help me in this matter and the many others who are having the same issue and for the manufacturer to be accountable for their own flaw. |
| Category | Air Bags, Structure:body, Unknown Or Other |
| Date | Aug 08, 2022 |
| State | MI |
| Description | Hit in the driver side tire, air bags didn't release. Truck then went up in flames. |
| Category | Structure:body |
| Date | Aug 04, 2022 |
| State | NV |
| Description | When driving down the rode the center hood scoop blew off 0 |
| Category | Tires |
| Date | Aug 04, 2022 |
| State | VA |
| Description | The contact owns a 2021 gmc sierra 1500 equipped with general tires, tire line: grabber hts60, tire size: 275/60 r20, dot number: (na). The contact stated while driving 15 mph in a parking lot, the rear passenger's side sustained a blowout. The contact stated that the low tire pressure warning light was illuminated. The contact was able to park on the side of the road and replaced the rear passenger's side tire with the spare. The contact took the vehicle to the local dealer to be serviced. The vehicle was not yet repaired. The tire manufacturer had been informed of the failure. The failure mileage was approximately 18,700. |
| Category | Electrical System:wiring |
| Date | Jun 30, 2022 |
| State | IL |
| Description | The contact owns a 2021 gmc sierra 1500. The contact stated while attempting to start the vehicle, the vehicle failed to operate as needed. The service parking brake, check engine, and other unknown warning lights were illuminated. The vehicle was towed to the local dealer to be diagnosed. The contact was informed that the failure was due to damaged electrical wiring caused by rodents. The contact was informed by the dealer that the wiring insulation was made from soy-based materials. The vehicle was repaired three times due to the failure. The manufacturer was notified of the failure. The approximate failure mileage was 23,300. |
| Category | Engine |
| Date | Jun 07, 2022 |
| State | MN |
| Description | Engine lifters failure, caused esc light to come on and check engine light and other dash lights. Lack of power from engine causing dangerous driving in traffic. |
| Category | Forward Collision Avoidance: Adaptive Cruise Control, Forward Collision Avoidance: Automatic Emergency Braking |
| Date | Jun 03, 2022 |
| State | WI |
| Description | When using adaptive cruise the brakes have engaged aggressively without cause. This has happened several times prior to my discontinuing the use of this option. I have not had it in for service yet (we just returned from vacation). |
| Category | Engine, Power Train |
| Date | Jun 02, 2022 |
| State | AR |
| Description | 1 june 2022, while driving, started hearing a clicking noise from front end, under hood. Took to local gm dealer, mechanic drove with me, and he heard the noise, said he would order a part and safe to drive. So, I went home. 2 june 2022 started same vehicle, a very loud banging, clicking, shuttering noise from under hood, I took back to same dealer, dealer said collapsed valve lifter. Gm service notice says for dealer to fix under warranty. Apparently, a known problem with many 2021 gmc 5. 3 l engines. Please make gm recall this issue for repairds |
| Category | Electrical System: Integrated Trailer Brake Control, Service Brakes |
| Date | May 31, 2022 |
| State | TX |
| Description | The contact owns a 2021 gmc sierra 1500. The contact stated that when pulling a trailer with electric brakes with their vehicle, a warning light stating to check the trailer would illuminate on their instrument panel. The warning light would also state that the electric brakes had disconnected and then reconnected shortly after. The failure would occur on a consistent basis. The main control computer system in the center where the radio is located would flash the message that the trailer brake gain not been recalled. The contact contacted the dealer who confirmed that the computer system was known to have an issue due to the interference between the electric brakes and the lad lights on the vehicle, however, there was no recall. The vehicle had not been repaired. The manufacturer was made aware of the failure. The approximate failure mileage was 21,000. |
| Category | Engine |
| Date | May 16, 2022 |
| State | PA |
| Description | Diesel exhaust fluid tank, high pressure |
| Category | Tires |
| Date | Apr 27, 2022 |
| State | ID |
| Description | Lt245/75r17 I bought these tires on walmart. Com june 2021 and had walmart install with road hazard and lifetime balance, I returned to walmart in april 2022 and was told I had a defective tire, that it was coming apart, I can see the fibers around the issue area and soft spongy for approximately 14 inches sounds like glue not sticking when I push around the bead area, walmart told me it was a manufacturer defective tire and they included that on the work order and also told me to take tire and contact manufacturer which I did, I have spoken and also emailed with a michael dorr with unicorn tire. Without any positive results only denied a claim. This tire needs to be inspected and I want a new one, this for sure is defective. |
| Category | Electrical System |
| Date | Apr 22, 2022 |
| State | PA |
| Description | The contact owns a 2021 gmc sierra 1500. The contact stated while using the gps, the digital speedometer failed to operate as needed. The contact notified the dealer of the failure and the system was rebooted; however, the failure persisted. The manufacturer was made aware of the failure and a case was opened. The approximate failure mileage was 1,000. |
| Category | Steering |
| Date | Apr 19, 2022 |
| State | CA |
| Description | As I was driving out of the parking lot my power steering suddenly was lost. A message appeared on the screen saying: service power steering drive with care and an esc message. A light also appeared. I was not able to steer at all and had to turn the truck off. I tried multiple times. After 5 minutes the message cleared as did the light. A day later (today- 4/19)the same thing happened in the parking lot. This is very dangerous. I have an appointment with the dealer. When looking up this problem it appears there are multiple recalls on other 2021 models but not the sierra though I see many complaints about the same problem on the sierra's. This is not safe and needs to be looked into further. |
| Category | Engine, Unknown Or Other |
| Date | Apr 10, 2022 |
| State | TX |
| Description | My truck shakes/shutters at random times. While steadily driving at constant speed and/ or shakes/shutters even more when I try to accelerate. |
| Category | Fuel/propulsion System |
| Date | Apr 03, 2022 |
| State | ID |
| Description | Part number: 85138746 - def tank assembly, heater, pump, reservoir. I was told there were issues with the heater and pump. The heater turns high or the heater won't work; and there are issues with the connector. 02/24/22: my truck has 16,000 approx. Miles. The check engine light came on and displayed message that I had so many miles until truck would be restricted to 65mph. I took my truck into kendall dealership in nampa, idaho and was told there was myself and another person who had the same issue. A couple weeks go by and I call the dealership back and was told that I was 5th in line and there were 20 behind me. I was told that there were 11,000 parts already spoken for and 6,000 parts on backorder. I was one of the backorder individuals. I was also told that they do not have a eta on when they would receive parts and that parts show up unexpected. They told me that I would have to contact gm customer service for assistance. The dealer called me back march 31st to see if I got my camper moved and how much it cost to move. They told me the dealership would cover one month truck payment and would like me to send in my loan payment statement. I asked for clarification as I didn't know how I could have been 2nd person and the other day he said I was fifth in line. He said that there are at least 2-3 persons for service technician at dealership. Only 2 got fixed in the last 2 months. I asked if the new part going in will have the same issue or will be a re-designed part that fixes the issue. Dealer said the same part. Gm is working on a re-design part and not ready for manufacturing. I asked why this wasn't on a recall and he said no because it would bring people in that don't need it replaced because their part is still working, and that gm doesn't have a re-designed part to fix the issue. Gortsema motors in grangeville, idaho a friend brought in their 2018 chevydiesel truck (with 87,000 miles) for the same issue. Dealer said they have many cases. |
| Category | Power Train |
| Date | Apr 03, 2022 |
| State | ID |
| Description | Problem: unable to shift transmission from d to another position like r, p, n due to snow/slush being on shifter. I travel on idaho state highways and county roads that are plowed. In february, I traveled state highway 14. Road conditions were plowed snow roads, broken snow floor, slush and pavement without slush or snow. I had a passenger with me on this trip from elk city, idaho to grangeville, idaho via sh-14. When I pulled into my storage unit, I could not shift from d to p or n or r. I could only drive forward. The temperature in grangeville was mid 40s. I did not have any tremendous snow build up on the under carriage or wheel wells. I drove to the dealer gortsema motors and their service technician said that I needed to go to a car wash and blow out the snow buildup next to the transmission linkage shifter. When I pulled into the car wash, I still could not shift the transmission. My passenger got out and used the water to push out the snow buildup around the linkage shifter. Then I was able to shift between all gears p, r, n, d. This is a big concern because this should not have happened. This is a major problem in the winter and had there not been a car wash to blow out the snow/slush, I would not be able to turn the truck off or restart the diesel truck in gear. There needs to be a protective shield around the shifter so that snow/slush does not get up into area and cause the shifter to not shift. |
| Category | Steering |
| Date | Mar 10, 2022 |
| State | CO |
| Description | The contact owns a 2021 gmc sierra 1500. The contact stated while the vehicle was standstill, the steering wheel seized. The contact stated no warning light was illuminated. The contact called the local dealer and made them aware of the failure. The contact was instructed by the dealer, to remove the ground cable from the battery and reinstall. The contact stated he was able to reboot and the steering wheel was able to move properly. The manufacturer had been informed of the failure. The failure mileage was approximately 15,000. |
| Category | Engine, Power Train, Service Brakes |
| Date | Mar 05, 2022 |
| State | CA |
| Description | The throttle body gets stuck wide open after the eninge gets up to operating temperature, it will give some warning with the throttle like on off throttle use and no codes show up at all. The risk of everyones is in extrem danger. The break are to soft and well not stop unless you put both feet on the break pedal down to the floor. Tranismission can not figure out what gear it needs to be in way too many gears and horrible fuel mpg for the 6. 6l duramax l5p. None of the gm dealership will look at the truck unless there is a code or it is happening right there when they look up the trucks vin. |
| Category | Engine, Fuel/propulsion System, Power Train |
| Date | Feb 28, 2022 |
| State | CO |
| Description | •the diesel exhaust fluid heater is a faulty component in the system, there is a back order on the part with no eta • my pickup only does 55mph right now and soon to do 5mph you cannot drive on a public road doing 5mph •there is thousands of other people having the same exact problem! •the def light is illuminated on my dash along with the check engine light, when you diagnose the error code it comes up with “p20c1 reductant heater c control circuit/open†|
| Category | Engine |
| Date | Feb 25, 2022 |
| State | PA |
| Description | The contact owns a 2021 gmc sierra 1500. The contact stated that the check engine warning light was illuminated and the vehicle failed to accelerate above 60 mph. The contact took the vehicle to the dealer who diagnosed that the def tank had failed and needed to be replaced. The vehicle had not been repaired. The manufacturer was not made aware of the failure. The approximate failure mileage was 4,000. |
| Category | Engine |
| Date | Feb 24, 2022 |
| State | AR |
| Description | The contact owns a 2021 gmc sierra 1500. The contact stated that after starting the vehicle, the check engine light remained illuminated and the vehicle would not properly accelerate while depressing the accelerator pedal. The vehicle was taken to the local dealer who diagnosed that the engine valve lifter was faulty and needed to be replaced. The vehicle was repaired. The manufacturer was notified of the failure. The approximate failure mileage was 11,000. |
| Category | Electrical System, Engine |
| Date | Feb 23, 2022 |
| State | OH |
| Description | While driving, when approaching speed of 40 mph, the engine begins to have dull shutter intermittently as though I am going over pot holes or rumble strips when I am not. Regardless of time or day or weather the truck has performed in this way. I have had it to the dealership twice for the issue. The first time they said they didn't feel anything and unable to duplicate the problem. The second time, the vehicle was with the dealer for several days trying to determine the other issue it was there for. I requested they again try to recreate the concern. The service assistance asked if I was willing to ride with the technician to see if I could point it out for him. In scheduled a time to do so, when I arrived, the technician was not there. I reside an hour away from the dealership. Making these round trips and getting no where with support or answers. When this happens, I become extremely anxious about the safety of the truck. Also- while 4 x4 is engaged, the truck has significant shutter when going up hill, as though the transmission is going to drop. The entire truck will violently shake. |
| Category | Electrical System |
| Date | Feb 16, 2022 |
| State | OH |
| Description | The console radio dash has gone completely black while both driving and while using it for the speaker/phone system. The incident resulted in the entire system restarting. |
| Category | Engine |
| Date | Feb 06, 2022 |
| State | VA |
| Description | Vehicle has less than 10,000 miles. Started making a loud noise and shuddering in the engine while at speed on the highway. Made it to dealer but was concerned we were going to break down before making it safely there. Service manager strongly suspects engine lifters (he drove it briefly with me and says this is a known issue with this truck & they currently have 3 other trucks in the shop with this same problem. He said parts are a 3-4 month wait and vehicle is not driveable, will break down, but couldn't say when - could be 10 minutes, an hour, or a day. This happened to me on 2/1/22, while out of town on vacation. An hour on the phone with gm and was passed around to 3 different individuals. Gm would not provide a loaner vehicle - leaving me stranded out of state. I had to get a rental vehicle on my own, gm claims they will reimburse me for a portion of this after 6-8 weeks. Gm will not tow the vehicle home to virginia (vehicle is in nc). I had to turn in rental car once I returned home because I can't afford to keep paying for this on my own and it's not a truck, which I depend on. Dealer is unable to fully diagnosis and document until end of week 2/7 or early week 2/14 as they are very busy. Unacceptable on all levels. |
| Category | Engine, Power Train |
| Date | Jan 30, 2022 |
| State | PA |
| Description | 8 lifters in my vehicle needed to be replaced. While driving my vehicle (12/4/21), after the auto stop feature was activated my truck experienced a lack of power and hesitation. I then turned the truck off and upon starting it was making a knocking noise. I immediately checked the oil as I wanted to make sure there was oil in the engine. I had warning lights on the dashboard and drove it about 3 miles to the dealer to be repaired. While driving it to the dealer, it did not sound right and shook. I also experienced a lack of power and was concerned for the vehicle to stall out while in traffic. The dealership informed me this is an issue with the 2021 gmc sierra with a 5. 3l v8 engine. I had seen online that gmc issued a service bulletin to have the lifters replaced in the 2021 gmc sierra that were on the lot before they were sold (early december 2021). If this is a known issue why weren't the lifters replaced in vehicles on the road before the ones sitting on the lot. 8 lifters were replaced by the dealership but there was a shortage of parts due to the nationwide problem. There were no warning lamps, messages prior to the failure. The only symptoms I had was shaking and lack of power as indicated above after the autostop feature was activated. I then drove about 2 miles and went into a store before coming out and having the loud knocking on startup followed by warning lights and messages. |
| Category | Unknown Or Other |
| Date | Jan 17, 2022 |
| State | ID |
| Description | The only way to get the heater to work on your feet is to turn off defrost, turn on only feet, turn on ac and sync both sides. I live in north idaho and when you do this your windshield fogs up and freezes. I have taken this to the dealership and was state "works as designed by gmc". To me this is unacceptable. I drive 90 miles each way to the airport and have to decide what condition I can live with. Completely frozen feet and a clear window or the reverse. |
| Category | Electrical System, Engine, Power Train |
| Date | Jan 14, 2022 |
| State | FL |
| Description | Can turn vehicle off while in gear (drive specifically). When you let off the brake, the truck acts as if it is in neutral. Discovered in my driveway when accidentally forgot to shift into park when I pulled in and pushed the stop button. Truck turned off, which would only expect if in park (or neutral), let off brake, and it began quickly rolling backwards as if it was in neutral. Fortunately the brakes were working, but had any children been riding a bike on the sidewalk or walking by, my truck may have hit them. Had I been more distracted and not noticed initially, it could have rolled into the road and hit my neighbors truck. This behavior can be reproduced every single time, and I can easily supply video. |
| Category | Power Train |
| Date | Jan 14, 2022 |
| State | FL |
| Description | When shifting into drive after reversing, truck will occasionally do a small thud and hesitate to move forward. This is from a stopped position after reversing, then braking, putting the truck into drive, then it happens when starting to move forward at very low speeds (I would say about 1-2mph). Vehicles recovers quickly, however it seems like a transmission mount or something may have issues. If another car were coming up quickly, or started going expecting you to start moving, the delay the thud and hesitation causes may be enough to cause a minor incident (assuming no high speed traffic coming up behind someone as they reversed out). This issue does not occur every time. I have owned the truck for 4 months, and it has happened only about 4-5 times in total. |
| Category | Structure:body |
| Date | Jan 10, 2022 |
| State | OR |
| Description | Tailgate falls open while traveling down the road |
| Category | Electrical System, Engine, Fuel/propulsion System |
| Date | Jan 08, 2022 |
| State | GA |
| Description | Less than 300 miles on the vehicle and it has thrown an error code p2b60. Relating to the engine coolant flow control valve position sensor. I have taken it to my local gm service center and they cannot see me for weeks. As of this morning the check engine light has disappeared but my fuel economy has severely decreased. It seems suspicious and possibly dangerous that it showed a check engine light with a warning of reduction in engine power the night before and disappeared in the am |
| Category | Electrical System, Steering |
| Date | Jan 07, 2022 |
| State | VT |
| Description | Started vehicle up in public parking lot and it had service power steering and esc messages. Vehicle could not turn and had to be towed to dealership. The problem has been confirmed by the dealer but they have had the vehicle for 2 days and cannot fix the problem. Dealer states code keeps coming up in bcm but they are not sure why or how to confidently fix it. There were not warnings or any symptoms of this problem as it drove to work fine that same morning. |
| Category | Engine |
| Date | Dec 27, 2021 |
| State | MI |
| Description | Famous lifter issue in the l84 engine. Hundreds of documented complaints and current class action lawsuit. I had to stop on a busy highway and it caused unsafe passing and irritated humans. |
| Category | Engine And Engine Cooling:cooling System:hoses/lines/piping/fittings |
| Date | Dec 23, 2021 |
| State | MO |
| Description | The contact owns a 2021 gmc sierra 1500. The contact stated while driving 15 mph and making a turn, the vehicle lost power steering assist functionality. Additionally, the brake pedal was depressed several times but failed to respond. The parking brake, traction control, brake, engine, and headlights warning lights were illuminated. The contact also stated that the warning message "limited power" was displayed. The contact stated that he depressed the brake pedal with his two feet from a standing position and the vehicle decelerated and he pulled into a driveway. The contact was able to continue to drive the vehicle. The vehicle was taken to the dealer who diagnosed that the vehicle software needed to be updated. The contact stated that the vehicle was repaired. The manufacturer was not notified of the failure. The approximate failure mileage was 10,000. |
| Category | Engine |
| Date | Dec 08, 2021 |
| State | MI |
| Description | On 11/19/2021. While on the express way our truck started sounding really bad. We drove it slower to a gm dealer in highland mi. They said we had a misfire. And there was nothing they could do at this time. We drove a little further and it got worse. We had to stop at a rest area. After dark and in the freezing weather. We had it towed to a dealer in frankenmuth mi. Our truck has 11,800 miles . It has a diagnostics report of valve lifter defects left bank. Starter had to be replaced. And now gm wants to only fix to affected bank . But on the unsold trucks they will repair both banks as stated in service bulletin n212353840 . If we have one bad lifter they should all be replaced as for this not to happen again. As of 12/08 2021 it is still in the shop [xxx] thank you information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6). |
| Category | Engine |
| Date | Dec 06, 2021 |
| State | WV |
| Description | 2021 gmc sierra 1500 at4 6. 2l engine, little over 15000 miles, purchesed may 2021. Drivining down the interstate with out warning, engine starting making back fire sounding noise, with a noticeable loss of power, I requested on star to do a vehicle diagnostics, no faults was reported, no check engine light, temp was normal, oil pressure normal. The noise was off and on at first and then remained constant. Fortunataly I was able to make it safely back to my residents. I parked the vehicle and did a scan code and it did not have any codes, I did a pending code scan and it had a p0300 code. I started the engine and the noise was louder at first and then got quiter after about 15 seconds of running the check enging light came on I shut the engine down and did another scan it gave me a p0302 code. I feel that the vehicle is unsafe to drive and could cause a accident if it locks up on the highway. I contacted gm and reported the issue, they said take it to a near by gm dealer, I told them that I felt the vehicle was unsafe to drive and they tried to contact me with road side assistance but I was unable to get anyone on the phone. I feel that gm is ingnoring a known issue and that this will result in accidents and possible loss of life. |
| Category | Electrical System, Engine, Power Train |
| Date | Dec 01, 2021 |
| State | MI |
| Description | Prior to this incident I had lifter failure on my 2021gmc sierraat 8464 miles, I was on my way to work and I heard a loud bang and I had to pullover off the highway, my dad had to come all the way out to get the vehicle because it had major engine damage and it was on a holiday so no one would come help me. The vehicle was in the shop for over a week getting these repairs done, upon receiving vehicle it had been a week and I received service four-wheel-drive messages on the dash. Trying to use four-wheel-drive after this was a no-go every time I push the button nothing would happen it would stay in two wheel drive. After this I made an appointment with the dealership for this issue to be fixed, as I was going to get readyto leave again with the truck having no issues other than what I've stated when I went to go start the truck nothing happened at all every light lit up on the dash and part of me thinks it's an electrical issue but the other part of me thinks the motor is locked up. Also the lights would not shut off when I turn the vehicle off so I'll have a dead battery in the morning. |
| Category | Service Brakes |
| Date | Nov 24, 2021 |
| State | VA |
| Description | Brake pads have excessive squealing. Squealing implies incorrect pressure to rotor to stop the vehicle, which highly concerns me as an operator. According to the dealer where I reported the issue, there is a technical bulletin that approves replacement of the brake pads for free if reported in first 7500 miles. My truck exceeded that mileage when I noticed the squealing. If this was a recall for the defective brakes, the dealer would cover the costs to repair, but not for a technical bulletin according to the service department, and confirmed by gmc. I now have to pay 00 to replace brakes on a new truck with 15000 miles on it, or risk my safety. I believe this should be a recall and appreciate any assistance in this matter. |
| Category | Engine |
| Date | Nov 23, 2021 |
| State | OH |
| Description | Valve lifter defects. June, 2021: 7,619 miles: left side valve lifter defect necessitating need for valve, push rod replacement on left bank of engine november, 2021: 13,171 miles: right side valve lifter defecting necessitating need for valve and push rod replacement on right side of engine |
| Category | Service Brakes |
| Date | Oct 26, 2021 |
| State | CO |
| Description | The vehicle recently had a recall repaired at the dealership. I subsequently took delivery on it as a brand new unit, and the brakes are extremely soft; to the point where I must depress the pedal to the floor to get it stopped even at slow speeds. I hoped it was just an air bubble from the repair; but the fluid levels are full and the dealer had no ideas on what could be wrong at this point. I have a great relationship with this dealer, and we'll continue working on it. But gm is releasing absolute trash lately and I fear that some poor family will load up, trusting these vehicles, and be badly injured or killed. After 200 miles of driving it back to my residence, both at highway speeds and residential road speeds, these brakes have not improved; ruling out an air bubble. I'm worried it may be associated with the recall that was previously remedied. |
| Category | Steering |
| Date | Oct 09, 2021 |
| State | MI |
| Description | Power steering stop working |
| Category | Electrical System, Service Brakes, Steering |
| Date | Oct 08, 2021 |
| State | FL |
| Description | I started my truck this morning, drove it 3 miles, and all of a sudden got an esc warning, parking break warning, and a degraded power steering warning all at one time. My steering wheel started vibrating vigorously, a clanking sound started under the hood somewhere, and none of my safety features worked after.. Cruise control, vehicle collision control, vehicle gap sensors, etc.. The vehicle is currently at the dealer being looked at. |
| Category | Air Bags |
| Date | Oct 01, 2021 |
| State | VA |
| Description | Vehicle purchased new in 2021; has less than 5,600 miles on it. Service restraint system indicator light began coming on in september. At first intermittently, then every few seconds. Sent vehicle to dealer for repair on 9/27/21. Dealer states not safe to drive because airbag may not deploy in case of accident. |
| Category | Engine |
| Date | Sep 24, 2021 |
| State | OK |
| Description | A lifter went out. While driving on a turnpike going 80 mph the engine starting knocking. The truck had to be towed to a gmc dealership where they confirmed a lifter went bad. The truck is a v8 with 8,000 miles on. The dealership advised what the problem was and replaced 4 of the 8 lifters. No warning was given, as soon as the lifter went out there were all sorts of errors that started showing up including emissions issues. |
| Category | Engine |
| Date | Sep 09, 2021 |
| State | NH |
| Description | While driving on the highway my truck started to buck and had a loud engine knocking noise. Speed was greatly reduced so much so that I was going under 45 mph in a posted 65. The check engine light did not come on. While sitting on the side of the highway there was a severe engine knock only when the revs on the engine were increased. Oil pressure and cooling temps were as they should be. The next day on the way to the dealership the engine started knocking. This time the check engine light came on, speed was greatly reduced at this time. After about five miles the knocking stopped and the check engine light went out. The dealership checked it out and stated the lifters were bad. It seems that this is a known issue with gm. I was told by the dealership that there were two other trucks ahead of me with the same issue. Also, because this is such a prevalent issue with gm, they cannot keep up with the demand for parts. My dealership is waiting for a head gasket. Gm has known about the faulty parts for approximately two years, and they are only replacing some of the faulty, poorly made parts, hoping the other side of the engine will not develop issues and fail. I feel this is placing the driver and occupants at risk while driving down the highway and not being able to maintain posted speed limits, or just locking up and engine, and coming to an abrupt stop. |
| Category | Fuel/propulsion System |
| Date | Sep 03, 2021 |
| State | NY |
| Description | I have had my gmc sierra 1500 for 2 weeks and it has less then 200 miles on it the first week I lost power the check engine light, air bag and traction control light started flashing and since then my engine light has be solid with code p0300 and it will intermittently loss power and start flashing. The dealer has it now but cannot figure out the issue. Total unacceptable for a brand new vehicle. |
| Category | Engine, Fuel/propulsion System |
| Date | Sep 01, 2021 |
| State | OH |
| Description | The truck has 7500 miles on it and the check engine light keeps coming on then goes back off. It is impossible to schedule service as the light goes off before it gets to dealer. The when driving the truck many times the check engine light will flash for a minute or so and then remain on steady. This is very frustrating and the dealer has found nothing. It has happened probably 10 times since the truck was new and continues now. The truck was just serviced and the dealer found nothing causing this. |
| Category | Engine, Service Brakes, Steering |
| Date | Aug 27, 2021 |
| State | MA |
| Description | Driving the car it started backfiring and then the esc light came on and the car engine seemed to become erratic as well as steering and braking error messages and the check engine started blinking. Very scary before I got it pulled over and very thankful I wasn't on the highway etc. I'm seeing all the issues online sounds like the supposed fixes for the 2019 models having issues aren't solving the problem. I bought mine in april and 4 months later it's become unreliable. |
| Category | Suspension |
| Date | Aug 26, 2021 |
| State | TN |
| Description | On 22 december 2020, I received a 2021 gmc sierra 1500 slt x31 truck. The day that I drove it I notice that the truck was riding as though it had a low tire issue. It was riding bouncy. I had no low tire light. I checked the tire pressure and they all was over inflated. I brought the pressure back to range, but the truck was riding the same over rough and bumpy roads that the rear end of the vehicle was shifting from side too side when you hit a bumpy or on rough roads. It felt like the rear end was coming off the ground very frighten. I called gm they assigned a case number and I took the truck to three dealership with the same answer that all bolts were tighten to spec. Ok I get that, but did not address the problem that the truck is doing. I am not comfortable driving this truck especially when you have no I deal when your terrain will change and the back end of y0our vehicle moves from side to sider on you. |
| Category | Engine |
| Date | Aug 23, 2021 |
| State | GA |
| Description | Bought gmc sierra 1500 brand new. At approximately 2300 miles the engine light started blinking. I took it in and they said they couldn't find anything wrong with it. At 3700 miles it started again and I took it in. It has a bent push rod causing engine failure. |
| Category | Engine |
| Date | Jul 29, 2021 |
| State | TN |
| Description | Gm has a lifter problem that causes complete engine failure. When this happens the engine completely locks up rendering the vehicle completely shutdown. This is happening over and over in early stages of 2021 chevrolet and gmc vortec v-8s. Mine happened at 13000 miles on a 2021 6. 2l gmc denali, and gm is only fixing the problem partially and as I understand with the same defective product that just failed. Also it is known this failure likely will happen again as it is a design flaw. If this happens in the wrong traffic situation it will be very dangerous. I am very concerned. When my vehicle was towed to dealer they had 7 other 2021 complete engine failures just like mine waiting for repair. |
| Category | Engine |
| Date | Jul 28, 2021 |
| State | MI |
| Description | The contact owns a 2021 gmc sierra 1500. The contact stated that while driving in inclement weather, the vehicle stalled without warning. The contact looked under the vehicle and saw that engine oil was leaking from a puncture in the oil pan. The vehicle was towed to the local dealer however, the cause of the failure was not yet determined. The manufacturer was notified of the failure. The failure mileage was 5,800. |
| Category | Structure:body |
| Date | Jul 02, 2021 |
| State | TX |
| Description | The contact owns a 2021 gmc sierra 1500. The contact stated while driving 20-30 mph, she heard abnormal noises coming from the trunk of the vehicle, with no warning lights illuminated. The vehicle was taken to the dealer, where it was diagnosed that the dash line had detached from its holder and was rubbing against the frame of the vehicle. The vehicle was repaired, however, the failure persisted. The vehicle was taken back to the dealer who diagnosed that the drive axle, band, and rear pinion needed to be replaced. The vehicle was not repaired. The manufacturer was not made aware of the failure. The approximate failure mileage was 420. |
| Category | Air Bags, Seat Belts |
| Date | Jun 17, 2021 |
| State | CO |
| Description | Airbag light and "service safety restraint system" keep flashing on and off intermittently. Sometimes every 5 seconds. Sometimes once or twice a day. This is a known issue with 2021 gm trucks and suvs. Trying to get vehicle in for service but dealer said they are booked 2 weeks out and won't given loaner vehicles at all anymore. The vehicle has less than 2000 miles on it. |
| Category | Electrical System, Service Brakes |
| Date | Jun 10, 2021 |
| State | WA |
| Description | Trailer brake wiring connection continually disconnectsthen reconnects some time later. Some periods of up to 10 minutes without having trailer braking power. Major safety issue when toeing fifth wheel trailer. We lost brakes going down steep grades. Gmc is aware of issue, but has not provided a solution. Vehicle has been yo service shop with no resolution. Case has been opened with gmc. |
| Category | Lane Departure: Assist |
| Date | Jun 07, 2021 |
| State | KY |
| Description | The contact owns a 2021 gmc sierra 1500. The contact stated while driving at undisclosed speeds, the lane departure assist warning failed to activate when the vehicle drifted out of the driving lane. The failure was intermittent. The cause of the failure was not yet determined. The vehicle was taken to the local dealer who was unable to identify the cause of the failure. The contact was informed that the vehicle operated as intended. The manufacturer was notified of the failure. The failure mileage was 100. |
| Category | Electrical System, Engine |
| Date | May 29, 2021 |
| State | OR |
| Description | This is the second time I stop at the grocery store for about 15 or 20 min, get back in the car push the start, then the truck keep cranking with no start for about 20 seconds. Then I try second time and it fires up. |
| Category | Power Train |
| Date | May 17, 2021 |
| State | IL |
| Description | The contact's father owns a 2021 gmc sierra 1500. The contact stated that her father was driving at an undisclosed speed, when the vehicle stalled. The vehicle stalled three times on three separate occasions and was taken to three different dealers. The vehicle was first towed to bill kay buick gmc (2300 ogden ave, downers grove, il 60515) and diagnosed as battery failure and repaired however, the failure recurred. The vehicle was then towed to phillips chevrolet of lansing (17730 torrence ave, lansing, il 60438) and diagnosed that the transmission cable caused the failure. The vehicle was repaired however, the failure recurred after getting the vehicle back from the dealer. The vehicle was then driven to zeigler buick gmc of lincolnwood (6900 mccormick blvd, lincolnwood, il 60712) but was not yet diagnosed nor repaired. The manufacturer was made aware of the failure and a complaint was filed. The contact was informed that the dealer wanted to repair the vehicle. The failure mileage was 3,000. |
| Category | Engine |
| Date | May 16, 2021 |
| State | TX |
| Description | 5300 miles and when you accelerate it knocks and or ticks, and loss of power all lights on dash came on |
| Category | Structure:body, Visibility/wiper |
| Date | May 04, 2021 |
| State | CA |
| Description | Sun glare reflects off center console cup holder with such intensity it's hard to focus on the road even with sunglasses on. |
| Category | Electrical System, Engine |
| Date | Apr 24, 2021 |
| State | FL |
| Description | The auto stop feature on my truck is dangerous! There is no way to permanently disable it. When pulling into traffic from a stop, there is a significant delay for the car to restart and get moving! I have almost been in several accidents because of this. Forget the in gas this junk might save someone over a year! It is dangerous |
| Category | Air Bags, Electrical System, Engine |
| Date | Apr 18, 2021 |
| State | NY |
| Description | Returned home after some shopping. Parked truck in drive way. Approximately 5 minutes after returning home my wife saw truck smoking from under the hood. Within another minute or two there were visible flames coming from the back edge of the hood. We called 911. Within 5 minutes the entire front end of the truck was engulfed in flames. The fire department arrived and put out the fire but the entire front and cab of the truck was destroyed. Fire investigators determined fire started at back of engine compartment near battery. Vehicle was stopped parked in off condition. In my driveway. No mechanical problems were noticed on ride home and there were no panel alerts for problems. |
| Category | Power Train |
| Date | Mar 27, 2021 |
| State | TX |
| Description | Transmission shifts hard when shifting up and when downshifting. Vehicle jerks when going speeds 70. |
| Category | Back Over Prevention: Warnings, Engine, Forward Collision Avoidance: Warnings |
| Date | Feb 28, 2021 |
| State | FL |
| Description | The truck is parked at dealership |
| Category | Engine, Fuel/propulsion System |
| Date | Feb 19, 2021 |
| State | OK |
| Description | While driving during winter conditions with temperature at 3 degrees on a residential street with limited traffic, the diesel fuel in the fuel filter gelled up which caused the vehicle to display reduce power mode and then immediately shut off and would not start. The vehicle coasted to a stop in the middle of the street while in traffic. The owners manual lists utilizing top tier diesel which I did. While additives are not normally needed in most states to fuel for freezing conditions evidently they are needed in oklahoma. The fuel filter housing is the only place where the fuel gelled up, which appears to be a theme in most gmc diesel trucks and does not effect fuel in the fuel tank due to volume. Gmc has done nothing to improve the design or increase insulation to the thin fuel filter housing. If I had been in fast traffic on the interstate it would have resulted in an accident and possible loss of life. |
| Category | Engine |
| Date | Feb 19, 2021 |
| State | SC |
| Description | Tl* the contact owns a 2021 gmc sierra 1500. The contact stated that while driving at 60 mph, an abnormal noise appeared under the hood. Without warning an explosion occurred. The contact managed to veer to shoulder of the road get out the vehicle to check and see what the noise was. The contact noticed flames appeared by the rear wheel on the driver side. The contact grabbed the fire extinguisher and extinguished the flames. The fire department was contacted however no report was filed. The police were contacted but no report was filed. The vehicle was towed to quality buick gmc, inc (7901 lomas blvd ne, albuquerque, nm 87110 (505) 765 1300) where it was diagnosed and determine the engine was faulty that would be covered under warranties to repair. The vehicle was repaired. However, the contact feels unsafe driving the vehicle. The manufacturer was notified of the failure started and started an investigation. The failure mileage was approximately 2,800. |
| Category | Lane Departure: Assist, Lane Departure: Warning, Steering |
| Date | Jan 18, 2021 |
| State | WA |
| Description | Brand new 2021 sierra at4. Keep lane assist hasn't worked since day one. Lane departure warning either. It's been to the dealer twice and still no solution. It won't turn on |
| Category | Engine |
| Date | Dec 15, 2020 |
| State | OR |
| Description | The vehicle was bought brand new and was only driven for a week. It was in motion on the freeway when the engine started to sound noisier than usual, like that of an older truck. It was hard to notice on higher speeds on the freeway, but upon slowing down on curves, it got more obvious that something was really wrong because the noise sounded like something was loose inside the engine. There was no 'check engine' light or any other warning lights. Upon exiting the freeway, the engine shut off completely while in motion. Fortunately, I was able to pull in a parking lot and park it safely. The engine would not start safely after that, and 'check engine' activated. The vehicle is currently being diagnosed at a dealership. Last update was that the engine was being taken apart completely because they said it's definitely inside it. |
| Category | Electrical System, Service Brakes, Steering |
| Date | Dec 07, 2020 |
| State | AZ |
| Description | Started vehicle everything was normal shifted vehicle into drive proceeded forward. While driving vehicles steering seized I was unable two move the steering wheel. It was also very difficult to stop the vehicle brakes were not working properly. Messages came up on to display reading service power steering and briefly imessage about the brakes flashed quickly on the message board. At that point turn the vehicle off after I got it stopped turn it back on same message still unable to turn the steering wheel repeated this several times approximately for fourth time the message cleared and the vehicle was back to normal. This occurred on a city street. |
| Category | Seats |
| Date | Dec 07, 2020 |
| State | AZ |
| Description | Reached for a fallen object between the driver and middle front seat and there is a razor sharp piece that took a large chunk out of the hand which caused heavy bleeding and medical supplies to stop. The vehicle was stopped and just tried to retrieve fallen object between the seats. The incredibly sharp parts need to be cut or removed from this and other similar vehicles or covered with something. It was bare metal exposed out with sharp edges that cut the right hand so badly. |
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About the Author:
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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I guess I shouldn’t complain our GMC Sierra Denali had 19,700 miles on it before we heard loud pounding sounds in engine like someone was talking a hammer and hitting the engine. Our truck is only one year old and it just really goes back and forth to my hubby’s work. No big trips with it and it breaks down like it has 300,000 miles on it! Unbelievable! No dealership we’ve talked to takes any kind of compassion about our issues they have already gotten your money. Spending +67,000 for a truck that breaks down is an embarrassment for GMC. I read they even knew about their engine problems. but still sold their lemon trucks! So, long story short we will be out without a truck for 2-5 weeks! Could be longer parts are the issue always blaming COVID! They are saying strip engine all the way down and their looking at the cylinders. I honestly don’t think they know what’s wrong our truck. If we had to do it all over again the heck with GMC, and that’s saying it nicely! We are so mad!!! Same story as others GMC said, probably they would cover rental car but they have to make sure it’s under warranty!!! What??? So, my hubby has no car to get back and forth to work and GMC could care less about their customers. This is mind-blowing. We all got lemons and GMC knew their engines were garbage from the start! I saw there were other recalls on seatbelt bolts, and curved tires on our trucks and we never got one recall notice from GMC and these are huge issues that can result in injuries. Geez, this is ridiculous spending that kind of money and the truck hardly makes a year! GMC YOU SINK!
5.3 engines are garbage. There to small for heavy trucks. My 2013 silvarado blew up at 105k. New engine was 8,000. dollars. Give me a Ram Hemi anyway even with their lifter oiling issue that sometimes hits at 100k pluse
2021 GMC Sierra Denali, 10k Miles, steering wheel, started to shake, check engine lights and traction control alerts came on. Same issue as all these trucks. Lifters or entire engine needs to be replaced. Buyer beware steer clear of this truck.
We have the same problem!
2021 GMC Sierra 5.3 14,000 miles warning lights came on lot of noise, dealer says lifters have to be replaced, my concern is what caused this, will it happen again and what other kind of damage. Never heard of more than 1 lifter going bad at one time. Think its BS. Not sure what to do
I have a ‘21 Sierra Denali. Has a 5.3l with 9K miles.
Check engine light came on so I took it to a dealer. They said it shows a misfire but it’s a software issue GM doesn’t have a fix for yet. Reset it.
One week later light is flashing and truck running horrible. Took to closest dealer. They said a lifter collapsed. Been waiting for almost 5 weeks now with no loaner. GM is supposed to reimburse me for a rental and make my payment, but not until work is completed. Been waiting for an upgraded head gasket but they’re only replacing one.
A $65k truck that I’m going to be worried about failing again. You buy a brand new vehicle to have a dependable ride.
GM doesn’t care.
I bought my 2021 sierra 5.3l truck in April 2021, had 8500kms on it and a spring let go on one of the lifters, it has been at the dealer for 2 weeks waiting on parts, have not heard when the parts will arrive.
A $60,000 truck 5 months old and problems with the engine just not acceptable, GM should replace the truck. If you pay that kind of money for a vehicle you should get a dependable machine.
Heard a loud knocking noise and noticed heavy soot on exhaust pipes. We have a 2021 Sierra Denali, 6.2L engine with exactly 5,000 miles. It was towed to the dealereship on Monday 8/16/21. Awaiting a response as to when it will be ready. We were told the rod is bent and lifters damaged.
2021 AT4 with 6.2 engine. 9100 miles. Ran ok but always had loud knocking. Started it the other day, loud banging and black exhaust smoke. Dealer told me they have to replace all lifters.
New 2021 GMC Sierra AT4 5.3L. 7,200 miles and broken valve spring and lifter. Dealer has had the truck for 29 days now and say it needs a complete engine replacement, but they have no idea when they will get it back to me. Only offered me a ride back to work. Had to argue for an hour and a half to get a rental car that I am paying for with the understanding that GM will reimburse me. Don’t feel comfortable about that, but have no other choice. GM has been no help. Dealer has been no help. This is a known issue on all 5.3 and 6.2L v8’s made by GM from June 1 to Oct 24 last year. They are doing very little about it.
2021 GMC Sierra, 6,400 miles and engine has a bad lifter. Engine service light did not come on until the sound got worse (two days). Truck was towed back to the dealer. Dealer had the truck over a week and truck has not been touched. I did obtain a new loaner (diesel version). We suspect the top end will be rebuilt…….
I have a 2021 GMC Sierra wi just a little over 3”11,000 miles. The dealership is not being helpful (long story there). I dropped my vehicle off and was told it would take approximately 2-weeks to have it returned. I did not receive a loaner or rental, although I was told this would be part of the deal. They did offer me a one-way Uber! I, use my truck for work and am required to have reliable transportation as a condition of employment. The dealership could care less, however, I did get a LOT of “I understands” after having to speak to multiple employees.
New 2021 GMC Sierra 5.3L dealer is already going to take engine apart replacing lifters,push rods head gaskets almost a full overhaul and only had truck for about 3 months second time at service department been almost 1 week at dealership the second time only has 6,030 miles there willing to trade the vehicle back but now I’m upside down almost 10 thousand I went in to get this vehicle with a trade at positive 5 thousand not fair for me to go negative equity on a truck that broke who wants to continue paying for a plus 50K truck with a rebuilt engine. There telling me these defective engine parts were not heat treated correctly from the factory plant due to Covid shutting plant ovens down it’s not my fault I told them.