GMC Sierra Complaints

15,732 consumer complaints on file.

#11731823April 17, 2026
ENGINE, ELECTRICAL SYSTEM
The contact owns a 2019 GMC Sierra 1500. The contact stated that while driving approximately 45 MPH, the accelerator pedal was depressed; however, the vehicle lost automotive power and stalled. Several unknown warning lights were illuminated when the vehicle stalled. The contact was unable to restart the vehicle, and the vehicle was towed to the residence. The contact became aware that the 400 AMP fuse was blown. The contact replaced the fuse and replaced the starter, however during a test drive, the vehicle stalled. The vehicle was taken back to the residence, and a 400-AMP fuse was replaced a second time. The contact also replaced the starter, the alternator and replaced the ground cables, and during another test drive, the vehicle stalled. The vehicle was taken back to the residence and the contact determined that the engine had seized. The vehicle was not repaired. The manufacturer was informed of the failure. The contact researched online and related the failure to NHTSA Campaign Number: 25V274000 (Engine and Engine Cooling); however, the VIN was not included in the recall. The failure mileage was approximately 159,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11731897April 17, 2026
ENGINE, POWER TRAIN, SERVICE BRAKES, HYDRAULIC
The contact owns a 2019 GMC Sierra 1500. The contact stated that while driving approximately 5 MPH, the rear wheels locked up. The check engine warning light was illuminated. The vehicle was taken to a local dealer, where it was diagnosed, and determined that the brakes needed to be replaced. The vehicle was repaired; however, the failure recurred intermittently. The vehicle was taken to another local dealer, Walker Bros Chevrolet (700 Erie St, Edinboro, PA 16412); for a second opinion, and the transmission and TCM were replaced. The vehicle was repaired; however, the failure reoccurred. Upon further investigation, the contact related the failure to the Customer Satisfaction Program: N192272400; however, the VIN was not included. The manufacturer was notified of the failure, and a case was filed. The failure mileage was approximately 40,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11731504April 16, 2026
ENGINE AND ENGINE COOLING
The contact owns a 2025 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed, the engine made abnormal knocking sounds. No warning light was illuminated. The vehicle was taken to the dealer, who discovered metal shavings inside the engine oil and determined that the crankshaft bearings had failed. The contact was informed that the engine needed to be replaced. The vehicle was not yet repaired and remained with the dealer. The manufacturer was made aware of the failure. The failure mileage was 26,634.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11731534April 16, 2026
POWER TRAIN
4/02/26 Truck bug jumped hard and shifted down causing me to fishtail and almost hit a car. Scared the crap out of me and the driver of the other car. Low power mode. 20 mph. No reverse. Towed to dealership. Diagnosis valve body spacer. This is our first GMC. Barely had it over a year. 78k miles. No warning lamps prior to failure.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11731599April 16, 2026
ENGINE
While driving on the highway, my engine failed unexpectedly and I had to coast across the highway without power. I had the vehicle towed to a GM dealership, where I was informed the failure was due to a lower-end engine issue and that a full engine replacement was necessary. I am aware of known issues with GM’s 6.2L engines and asked the dealership about the related recall. They acknowledged that the failure I experienced is consistent with the symptoms seen in the defective 6.2L engines. However, they stated that because my truck is a 2020 model, it does not fall within the affected VIN range. I ultimately paid nearly $11,000 for a new engine. Given the nature of the failure and its alignment with known issues, it is difficult to believe this was merely coincidental. I strongly believe the same defect exists in my engine, despite it not being included in the current recall range.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11731601April 16, 2026
ENGINE
Lifter failure cylinder #8, this is a 2019 GMC Sierra Denali 4x4. It has a 6.2L engine. With 92823 miles on it. It would be nice if GM would do a recall on this year motor as well.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11731660April 16, 2026
FORWARD COLLISION AVOIDANCE: ADAPTIVE CRUISE CONTROL
I am reporting a serious safety issue involving unintended acceleration in my vehicle. The vehicle accelerates unexpectedly without driver input (specifically without pressing the “resume” function), requiring immediate braking to regain control. This issue has occurred numerous times over the past 4–5 months. Incidents have primarily happened at low speeds (approximately 20–25 mph or less), including while making turns, exiting parking lots, and once in our yard, where the vehicle nearly struck our home. The problem has occurred both when adaptive cruise control was active and when it was turned off. In the most recent incident, adaptive cruise control was off, and the vehicle suddenly accelerated while traveling in about 20–25 mph on the main street. The driver had to apply the brakes forcefully to avoid a collision with the vehicle in front. There have been no warning lights, alerts, or messages prior to these events. During at least one incident, a “braking required” message appeared only after the unintended acceleration had already begun. The vehicle has been taken to a GMC dealership multiple times, but the issue has not been duplicated by them. The dealer suggested the possibility of accidental activation of the “resume” button; however, this did not occur. The vehicle is currently at the dealership (since April 6) and is available for inspection. This defect presents a significant safety hazard to the occupants of the vehicle and to others on the road.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11731720April 16, 2026
ENGINE, POWER TRAIN, FUEL/PROPULSION SYSTEM
While driving into work, I noticed a knocking sound from the outside of the vehicle. Once parked, upon further inspection I narrowed down the area of the noise to the bottom rear of the engine/front of transmission. Fortunately, I was able to park in front of my office building and wasn’t stranded on the side of the road but under different circumstances it could've been the side of a busy highway or hours from home. I had the vehicle towed to the dealership I originally purchased from, the dealership was able to duplicate the issue with me present. Later that afternoon I was informed that the engine had failed and a replacement would be ordered. There was no prior indication of a problem or warning/CEL’s. The engine failed after the dealership had completed the engine recall ( pico test and 0-40W oil change ) related to the vehicle. I am reporting this in hopes that it helps with the investigation. This has been very disappointing for me as I have supported the brand of vehicle for many years. Only to have many issues under 80,000 miles and to lose confidence in the vehicle I purchased and the company.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11731366April 15, 2026
UNKNOWN OR OTHER, FORWARD COLLISION AVOIDANCE: WARNINGS, LANE DEPARTURE: ASSIST
Vehicle keeps displaying a warning message to service drivers assistance system. Taken the vehicle to the dealership multiple time and the condition still persists. Dealership contacts GM tech support and are being told that GM is aware of the problem, programing issue, but they have no solution after several months. Multiple vehicles at many dealerships have the same problem. I don't feel safe driving the vehicle. Drivers assistance system includes multiple cameras and sensors. This condition could cause severe accidents of even death if the system gives false or wrong information
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11731391April 15, 2026
UNKNOWN OR OTHER, ELECTRICAL SYSTEM
On March 3rd 2026, I went to a doctors appointment. Halfway into the 50 minute drive, I noticed the on the infotainment screen that my GPS was still showing me being at home. It was working normally a couple days prior to parking the truck. After my Dr appointment, I did some online research and followed recommended procedure to do a hard reset of the infotainment/radio to try and refresh the signal. Didn't work so I checked the recommended fuse and it was good. Realized that the OnStar and truck's cellular/data was also not working. After more research, I found that it's a very commonly reported issue on 2022-2024 trucks. Apparently the Telematics module will freeze/glitch or fail. Took my truck down to American Chevrolet on April 13th for the Data Gateway Module recall# N242435631 and asked their service advisor if he could find out what's going on. After the recall was performed, he verified that the Telematics module is indeed dead but, because I'm at 39,000 miles, they could not fix it at no cost. The biggest reason why I've been driving this truck so frequently is because it's the safest truck we have and the Automatic Crash Response & Emergency GPS gives my girlfriend some piece of mind when traveling with our two sons. She now refuses to travel with me in the truck. I'm also upset that the cellular data is paid up until I believe March of 2027 and now I can't use services paid for but, I'm more concerned about the safety features that are no longer working. For this part to completely fail or lock up at under 40k miles is absolutely absurd. I'm going to request a Good Faith repair through GMC but, I want this to be documented. Thank you for your review of this problem.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11731414April 15, 2026
STRUCTURE:BODY
The same thing that happenes to the grill mold in recall N242490120 happened to my vehicle with the hood vent ornament. For reference, the Part number is 84802205/85057002. I was driving on the highway to work and it flew off which caused it to scrape my hood and chip my windshield.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11731433April 15, 2026
EQUIPMENT, SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS:DISC:CALIPER
The contact owns a 2025 GMC Sierra 3500 used for hauling a 2026 Aluminum Trailer equipped with a DeeMaxx: DBI-7K-MAXX-SS-KIT brake kit. The contact stated that while driving at an undisclosed speed, the brake caliper bracket detached due to insufficient generic quality bolts included in the brake kit. The contact pulled over and had the trailer towed to an RV park. The vehicle was not diagnosed or repaired by an independent mechanic or dealer. The manufacturer was made aware of the failure but informed the contact that the failure was caused by improper installation. The failure mileage was unknown. The VIN was not available.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11731196April 14, 2026
UNKNOWN OR OTHER
Vehicle Fire. Total Loss. While driving, vehicle began to smoke from under the hood. Fire grew rapidly and vehicle is totaled. No warning signs leading up to the incident.
Crash:
No
Fire:
Yes
Injuries:
0
Deaths:
0
#11731262April 14, 2026
ENGINE
I was exiting a main highway and when I let off the accelerator the engine died unexpectedly with no prior signs of failure and would not turn over to restart, luckily I was able to coast onto a side street out of the way of moderate traffic. I called GM roadside assistance and had the vehicle towed to my local dealership. The service department confirmed that the engine was seized and needed replaced. My vehicle went through the L87 recall and passed inspection last fall at 29,400 miles, had another oil change at around 33,500 miles. The engine failed at 37,800 miles. I am the original owner and have always maintained the vehicle to GM standards. I feel that the recall is not solving this problem, because the engines are failing anyway. At this time my vehicle has been at the dealership service department for three and a half weeks, and is waiting on the replacement engine. The dealership has provided a loaner vehicle.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11731146April 14, 2026
STRUCTURE:BODY:DOOR:HANDLE:EXTERIOR, STRUCTURE:BODY:HATCHBACK/LIFTGATE
The contact owns a 2025 GMC Sierra 2500. The contact stated that the front driver’s side door handle failed to operate as needed, and the contact was unable to exit the vehicle through the driver’s side door. The vehicle was taken back to the dealer, and a new handle was ordered. The part was replaced under warranty. Soon after the repair, the liftgate failed to open or close as needed and became inoperable. The vehicle was taken back to the dealer for the liftgate to be serviced under warranty. The manufacturer was not notified of the failure. The vehicle remained with the dealer unrepaired. The failure mileage was approximately 300.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11730820April 13, 2026
ENGINE
There is a click/ticking noise when vehicle is started. Noise gets louder and faster when accelerating. Have taken vehicle to 2 mechanic shops and been told by both places it is bad lifters and exhaust manifolds. I took this truck in because of loss of power. This issue has put me in unsafe/ dangerous positions on multiple occasions.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11730861April 13, 2026
ENGINE, POWER TRAIN
The contact owns a 2021 GMC Sierra 1500. The contact stated that while driving approximately 45 MPH, the transmission inadvertently shifted from drive (D) to first gear. The check engine warning light was illuminated. The vehicle was pulled over to the side of the road and then towed to the dealer, where it was diagnosed, and it was determined that the valve body needed to be replaced. The vehicle was not repaired because parts were not available. The manufacturer was notified of the failure. The failure mileage was approximately 103,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11730917April 13, 2026
ENGINE
I have a 2019 GMC AT4 and it has stalled on the highway multiple times and smokes every time I started. I have read that the engine in it has been recalled on multiple other years but the one I purchased needs a $25,000 repair and it’s not safe to drive. There is not a current recall, but I’ve read that this engine on almost all the other trucks and SUVs that have it have had problems.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11730962April 13, 2026
ENGINE
Coolant control valve failed. Seems to be a known issue with year make and model but not all vin have been approved for special warranty despite occurring on same vehicle.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11730979April 13, 2026
POWER TRAIN
I was driving down the road at 55 mph on 4/12/2026 and had let off the gas for a 45 mph zone when I experienced a violent downshift of the transmission that squealed the tires momentarily and felt like someone had hit me from behind. It startled me and caused me to lower my speed down to 20 mph. I continued driving to my destination and when I let off of the gas doing 45 mph for a slight curve I had another violent downshift that felt again like someone hit me from behind. I contacted a GMC dealer on 4/13.2026 to see if there was a recall on the transmission that I wasn't seeing online and was told no. I described what I experienced to their service department and was told to flush out the transmission fluid and replace the filter. I did experience another bad downshift at a slower speed (about 25 mph) on 4/13/2026. There wasn't any warnings or lights that came on when these three incidents occurred. When looking online I did see there was a similar recall for 2020-2022 GMC Sierra's where customers were experiencing similar violent transmission downshifts and am wondering if this issue is affecting more than just those three model years.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

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