GMC Sierra Complaints (2026)

171 consumer complaints on file.

#11765373September 18, 2026
ELECTRICAL SYSTEM, ENGINE
The contact owns a 2026 GMC Sierra 1500. The contact stated that while at a stop light, the engine shut off to save fuel, but after releasing the brake pedal, the engine failed to restart. The contact shifted to park, and the engine restarted. The contact stated that the failure had occurred on several occasions after the fuel saving feature was deactivated. Additionally, the contact stated that the failure had occurred while slowing down and driving over a railroad track and hauling a trailer. The vehicle was taken to the local dealer on several occasions, but the failure was not duplicated. The manufacturer was notified of the failure. The failure mileage was 4,300.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11764905September 17, 2026
UNKNOWN OR OTHER
The tailgate opened without my knowledge on my first drive home from the dealer. I was pulling my trailer at the time, when I backed into my driveway it pinched against the trailer and damaged the tailgate. There were no warning lights or anything to tell me it came open. The dealer examined it and found nothing wrong with the systems. It was raining on my way home and I know they've had problems with that in the past. While this incident didn't lead to any accident, it very well could have. I'm a sub-contractor, I haul a lot of tools and product that I rely on that tailgate keeping it all contained. If it comes down without any warning it could easily lead to a major accident.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11764644September 16, 2026
ENGINE, ELECTRICAL SYSTEM
The contact owns a 2026 GMC Sierra 1500. The contact stated that while driving 35 MPH, the vehicle stalled. Additionally, the wheels locked up, and transmission made a screeching sound. The contact was able to restart vehicle after approximately 5 minutes. The failure was recurrent. The vehicle was towed to the dealer, but the dealer was unable to duplicate the failure. The dealer replaced an unstated module that was damaged during the failure. The manufacturer was contacted by phone and was made aware of the failure. The failure mileage was approximately 6,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11764703September 16, 2026
POWER TRAIN, COMMUNICATION:MANUFACTURER TELEMATICS
The contact owns a 2026 GMC Sierra 1500. The contact stated that while hauling a trailer and making a left turn at 5 MPH, at a busy intersection, the message "Shift to Park" displayed, and the vehicle lost motive power. The vehicle was restarted. The contact stated that the failure was persistent. The local dealer was notified of the failure by phone. The vehicle was taken to the dealer, where it was diagnosed that the telematics module had failed and needed to be replaced. The vehicle was repaired. The failure mileage was approximately 3,900.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11764358September 15, 2026
ENGINE
Catastrophic engine failure. A 2026 GMC Sierra with only 7360 miles had engine failure while driving at 45 miles per hour which resulted in no power from the engine to assist in getting the truck off the road and stopped safely out of the road. In my case, it happened late at night so traffic wasn't an issue. I was just stranded in a dark, rural area late at night. If this happens to someone in traffic, the results may be much different from mine. After this incident, I learned that this is not uncommon and many trucks/SUVs with the GM 6.2L engine have failed in the same or a similar manners and earlier models have been recalled for the same issue.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11764465September 15, 2026
TIRES
The contact owns a 2026 GMC Sierra 1500 equipped with Bridgestone Tires, Tire Line: Dueler A/T, Tire Size: 275/60/R20, DOT Number: 17XW09K63. The contact stated that the sidewall around the bead of the four tires were cracked. The tires were dry rotted. The tires were the original equipment. The dealer was notified of the failure in person. The failure mileage was approximately 13,300.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11764203September 14, 2026
ENGINE
on Friday the 11th the vehicle quit running had to be towed and left me stranded in the middle of an intersection. This is a second vehicle from GM with the 6.2 L engine that has done this to me. The dealer says it’s catastrophic engine failure, and they’re gonna replace the engine. I was told that GM Edward repaired this issue but is still selling brand new trucks with this motor that has this failure, they can lead people stranded in very compromising positions.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11764094September 14, 2026
ENGINE
At just below 5,000 miles of use, my new 2026 GMC Sierra At4 (6.2L V8 engine) is currently undergoing a total engine replacement arising from traces of metal being detected in the oil filter. Although covered by GMC Warranty since it is essentially a brand-new vehicle, I wanted to report this issue as it is most likely part of the large GM recall pertaining to this L87 engine since I am concerned this is related to ongoing 6.2L L87 engine failure investigation. It is expected to be out for around 4-6 weeks with a new engine incoming and would want to be covered if the new engine fails in the future with any issues relating to this case.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11763861September 12, 2026
ENGINE
Was driving the vehicle and started making a loud knocking noise and had a loss of power.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11763117September 9, 2026
FUEL SYSTEM, GASOLINE
The contact owns a 2026 GMC Sierra 1500. The contact stated that while driving at various speeds, the vehicle hesitated to maintain automotive power and was a potential safety risk for his wife and children. The message "Shift to Park and Restart Vehicle” was displayed. The vehicle was shifted into park(P) and back into drive(D) as a temporary fix. The vehicle was taken to a local dealer on several occasions to be diagnosed; however, the cause of the failure was unknown. The failure mileage was approximately 700.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11762965September 9, 2026
ENGINE
Rattling, knocking sound from the 6.2 ltr motor. Dealer verified engine failure, needs to be replace. Engine failed with only 4770 miles. Never made it to the first oil change.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11762681September 8, 2026
ENGINE
Complete engine failure. Had to get the engine replaced with only 2,700 miles on it. Back in the shop on 9/5 to fix the engine again.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11762558September 7, 2026
UNKNOWN OR OTHER
The infotainment system keeps having the sound completely shut off. The radio, GPS, blinker system sound will not work.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11762573September 7, 2026
ENGINE
Three times this has happened. Most recently Pulling in drive and jumps out of drive to park with a jerk and stops.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11762072September 4, 2026
POWER TRAIN
The contact owned a 2026 GMC Sierra 1500. The contact stated that while slowly driving up a slightly inclined driveway and making a left turn, the engine shut off. The contact stated that either the parking brake activated, or the vehicle suddenly decelerated. The contact stated that the failure had occurred several times, with three identical vehicles, including the loaner vehicle provided by the dealer. During the failure, the messages, "Press Start" and "Service Transmission" were displayed. The vehicle was taken to the local dealer who was unable to determine the cause of the failure. The vehicle was not repaired. The vehicle was later traded in for an identical vehicle. The manufacturer was notified of the failure.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11761844September 3, 2026
POWER TRAIN
The contact owns a 2026 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed, the transmission independently shifted to park or neutral. The contact stated that the failure had occurred while driving at slow speeds. The contact stated that during one failure, the brakes independently activated, and the vehicle shut off. The contact stated that while attempting to restart the vehicle, the vehicle started. The contact stated that the failure was persistent. The dealer was made aware of the failure by phone. The vehicle was taken to the dealer; however, the diagnostic result was not provided. The failure mileage was approximately 500.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11761966September 3, 2026
POWER TRAIN
The contact owns a 2026 GMC Sierra 1500. The contact stated that while slowly driving up a slightly inclined drive port and making a left turn, the vehicle shut off and the parking brake was activated or the vehicle suddenly decelerated. The contact stated that the failure had occurred on several occasions with three separate identical vehicles, including the loaner vehicle provided by the dealer. During the failure, the messages "Press Start" and "Service Transmission" were displayed. The vehicle was taken to the local dealer who was unable to determine the cause of the failure. The manufacturer was notified of the failure. The failure mileage was 29.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11761659September 2, 2026
ENGINE
XXX Pulling into Mason Park - Truck Shot down while driving. Went into Park (immediate stop) 2 of my Kids were in the truck at the time. Restarted truck and loud Noises. Immediately backed into parking space shut down and towed. Sent to dealership XXX Called spoke co/ Mark. [XXX] had tech. look at truck. expressed My concerns and Should Never occurred @ 6788 miles. Expressed Something Needs done. Recommend contact GMc. - Call GMC, Crated a Case #XXX. Engine replaced after 2 months. No one checked the transmission or had explained why it went into park while in operation.Refused to look at any other concerns. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11760712August 30, 2026
POWER TRAIN
Aug 14th, 9:49 pm - Vehicle was placed in park and driver got out. A few seconds later the vehicle started moving forward under its own power towards the driver who was now infront of vehicle walking foward away from vehicle. Passenger hopped over the driver seat to press on brake pedal to stop vehicle. At same time, driver turned around and noticed vehicle moving towards him. Passenger was able to stop vehicle but not before it ran off the driveway and into and over a recreational firepit area. Driver was on opposite side of this. Driver got in to vehicle, verified transmission was now fully engaged in Park, and reversed the vehicle off firepit area. Damage to both vehicle, and firepit ring and landscaping area. Security footage later confirmed vehicle was placed in park, brake lights went out, and vehicle remained stationary for approximately 3 to 5 seconds before driver exited vehicle. It was when driver shut door that vehicle then moved, as if the Parking pin did not engage or failed to stay engaged. Owner traded vehicle in with another dealer soon after, due to other ongoing issues involving the steering and brake system that had not been resolved. Approximately 11,580 miles on vehicle at the time of incident. No personal injuries reported.
Crash:
Yes
Fire:
No
Injuries:
0
Deaths:
0
#11760716August 30, 2026
ENGINE
We were told when we purchased our 2026 GMC Sierra 1500 that all the engine problems have been remedied. Purchased our new truck January 3, 2026 put 2001 miles on the truck went on June 29. The engine suddenly just stopped while driving on the highway. We were able to pull over unable to ever get it to start forced to have it towed to a nearby GMC dealer where it has been ever since were told it had to have a complete new engine put in we have corresponded with General motors on three different occasions we still sit with no offer as we did apply for a lemon law buyback but General Motors continues to sell these vehicles which is very deceptive and misleading as this situation was not remedied in any 25 or 26 models.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

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