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My Investigation Into 2026 Rivian R1S Problems: What Every Owner Needs to Know
Problem analysis of the 2026 Rivian R1S found issues regarding unexpected acceleration and power loss.
Key Points
- Lemberg Law reviewed real owner complaints, internal data, and NHTSA data to identify the main concerns reported by 2026 Rivian R1S drivers.
- The most frequently reported problem involves unintended acceleration and brake failures, including complaints about vehicles suddenly lunging forward while brakes failed to stop them.
- Additional reported issues include power loss, rear door emergency egress concerns, and inaccurate battery range reporting, while repeated defects may support lemon law claims for compensation or other remedies.
One trend I keep noticing across EVs is unexpected acceleration. I have seen it come up in Hyundai IONIQs, Teslas, and now the 2026 Rivian R1S.
The root cause varies. Sometimes it is a software glitch. Sometimes it is a driver assistance system misfire. Whatever it is, it is scaring people, and in some cases it is causing crashes.
My name is Sergei Lemberg, and I have over twenty years of experience representing consumers in vehicle defect cases. I reviewed NHTSA complaints, owner feedback, and our own internal data for the 2026 Rivian R1S. As always, not all R1S vehicles will experience these issues. These are simply the most commonly reported defects, likely affecting a small percentage of vehicles.
Here is what I found.
Most Common Problems with the 2026 Rivian R1S
My analysis found the following issues as the top problems facing 2026 R1S owners:
- Unintended Acceleration and Brake Failures: Reports indicate sudden, uncontrollable acceleration combined with unresponsive brakes, leading to crashes and injuries.
- Power Loss: Reports of complete propulsion loss while driving, with issues linked to battery cell capacity.
- Rear Door Emergency Egress: The rear doors lack accessible manual latches, raising serious safety concerns during power failures or emergencies.
- Inaccurate Battery Range Reporting: Drivers note misleading range estimates, especially under 20% charge, causing stranded situations.
- Navigation and Map Errors: The in-car navigation system shows inaccuracies, which complicates route planning and safety.
Top Problem #1: Unintended Acceleration and Brake Failures
The top issue at the time of this research is unintended acceleration, which in some cases is accompanied by brake failures. Here’s what owners are experiencing:
- Rivian R1S vehicles accelerated violently while idling or at stops.
- Brake pedal depression did not stop the vehicle as intended.
- Crashes occurred involving stationary vehicles, medians, and even homes.
According to one owner
“I am writing to report a serious safety incident involving my 2026 Rivian R1S. While I was slowly parking the vehicle, it suddenly experienced what appears to be unintended acceleration, causing the car to lunge forward uncontrollably and crash directly into my home. This resulted in significant property damage as well as injuries to the passengers inside the vehicle.”
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Top Problem #2: Power Loss
Another top complaint my research identified is power loss. Here is what owners are experiencing:
- Complete propulsion loss at highway speeds with little or no prior warning
- Dashboard SOC reading that does not reflect actual cell capacity
- 12V battery dying after propulsion failure, disabling hazard lights
- Firmware updates performed but hardware defect left unresolved
- Extended roadside waits and significant out-of-pocket towing costs
An owner summarized the experience as
“Complete unwarned propulsion failure on [XXX] at highway speed. Dashboard showed 8% SOC immediately before failure [with] no warning, no alert. Vehicle lost all propulsion 5 miles from nearest charger. Stranded 7 hours. $225 out-of-pocket towing/transport costs.”
Top Problem #3: Rear Door Emergency Problem
Next up, rear door emergency egress. This one is straightforward but worth flagging. Here is what owners are reporting:
- The rear door latches are not easily accessible in emergencies.
- Power failures or software glitches can trap passengers inside.
- Unlike front doors, rear manual releases lack visual cues or easy-to-reach hardware.
One complaint stated
“I would like to file a safety concern regarding the vehicles rear doors. The manual latch is covered by a strong piece of plastic that cannot be opened in a quick emergency. I am very worried as I drive with family and I don’t want them to potentially be stuck. The front doors have an easy manual latch right next to the electric door open button, and I would like to report this concern as the back doors should also have a manual latch just like the front. The current latches genuinely are difficult to open.”
What Should You Do If Your 2026 Rivian R1S Is a Lemon?
If you own a 2026 Rivian R1S and are experiencing repeated defects or safety concerns, you may have a lemon vehicle under your state’s consumer protection laws. A lemon typically means:
- The vehicle has substantial defects impairing its use, value, or safety.
- The manufacturer or dealer has failed to repair the vehicle after a reasonable number of attempts.
- You have documented all repair visits, issues, and communications.
I recommend taking these steps immediately:
- Keep a detailed log of all problems, repair orders, and correspondence with Rivian or dealers.
- Report safety concerns to the National Highway Traffic Safety Administration (NHTSA).
- Contact Lemberg Law for a free consultation to understand your legal rights and lemon law eligibility.
Lemberg Law offers no-cost representation and operates on a contingency basis, meaning you do not pay unless we win your case. Lemon law claims are time-sensitive, so contact us today before it’s too late to protect your rights and seek compensation or vehicle replacement.
Click 877-795-3666 now to call us.
Or go ahead and fill out our Contact Form. Our services are absolutely free to you.
About the Author:
Sergei Lemberg is an attorney focusing on consumer law, class actions related to automotive issues, and personal injury litigation. With nearly two decades of experience, his areas of practice include Lemon Law (vehicle defects), Debt Collection Harassment, TCPA (illegal robocalls and texts), Fair Credit Reporting Act, Overtime claims, Personal Injury cases, and Class Actions. He has consistently been recognized as the nation's "most active consumer attorney." In 2020, Mr. Lemberg represented Noah Duguid before the United States Supreme Court in the landmark case Duguid v. Facebook. He is also the author of "Defanging Debt Collectors," a guide that empowers consumers to fight back against debt collectors and prevail, as well as "Lemon Law 101: The Laws That Lemon Dealers Don't Want You to Know."
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