GMC Sierra Complaints

15,732 consumer complaints on file.

#11670772July 2, 2025
POWER TRAIN
Unknown timeline for recall repairs.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11670789July 2, 2025
ELECTRICAL SYSTEM
Diagnostic: Video Processing Module includes replacement and reprogramming and calibrations Diagnostics when referred to in an automotive sense is the various testing done on the automobile to ensure safety and proper engine functioning. These tests are done with different sensors, computers and machines to establish a “cause and effect” relationship between what is working and what is not working with the automobile. The forms of diagnostics can range from brakes, to air conditioning, to suspension and many more. PARKING GUIDELINES ON SCREEN DO NOT WORK AND THERE IS A BLUE HOUR GLASS ON SCREEN. $2,200 estimate to repair.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11670861July 2, 2025
ENGINE AND ENGINE COOLING
The contact owns a 2022 GMC Sierra 1500. The contact received notification of NHTSA Campaign Number: 25V274000 (Engine and Engine Cooling); however, the part to do the recall repair was not yet available. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The dealer was made aware of the issue and confirmed that parts were not yet available. The manufacturer was made aware of the issue and confirmed that parts were not yet available. The contact had not experienced a failure. VIN tool confirms parts not available.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11670918July 2, 2025
ENGINE AND ENGINE COOLING
The contact owns a 2024 GMC Sierra 1500. The contact received notification of NHTSA Campaign Number: 25V274000 (Engine and Engine Cooling); however, the part to do the recall repair was unavailable. The dealer was contacted and confirmed that the parts were not yet available. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was not made aware of the issue. The contact had not experienced a failure. VIN tool confirms parts not available.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11670922July 2, 2025
ENGINE
The contact owns a 2021 GMC Sierra 1500. The contact stated that upon starting the vehicle, the vehicle was idling abnormally, prompting the contact to turn off the vehicle. The contact stated that the check engine warning light was illuminated. The vehicle was taken to the dealer, who diagnosed a failure with the lifter in cylinder #4. The contact stated that the lifter had collapsed into the engine, causing damages to the engine and camshaft. The vehicle was repaired. The manufacturer was not notified of the failure. The failure mileage was 98,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11670931July 2, 2025
ENGINE
Engine code P1098 indicating failure of Cooling Control Valve (CCV) at 2.5 years old, 49k miles. Display on dash indicates acceleration reduced warning, fan in engine bay running at high level while actual temperature reads normal.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11670958July 2, 2025
STRUCTURE:BODY
DURING AN OIL CHANGE IN MAY I WAS INFORMED THAT MY FRAME WAS EXTREMELY ROTTED AND WAS IN JEOPARDY OF CRACKING IN HALF . THE FURTHER I DIG INTO THIS, I'M FINDING THAT GM IS AWARE OF THIS ISSUE. THE VEHICLE IS AVAILABLE FOR INSPECTION.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11670439July 1, 2025
STRUCTURE, VISIBILITY
The contact owns a 2020 GMC Sierra 3500. The contact stated that while driving 45 MPH with passengers seated in the rear seats, the passengers became aware that water was entering the vehicle between the window and frame. There were no warning lights illuminated. The vehicle was taken to the local dealer, who informed the contact of Technical Service Bulletin: 18-NA-383. The vehicle was not diagnosed or repaired. The manufacturer was contacted and confirmed that there was no special coverage or warranty coverage on the vehicle. The contact was referred to the NHTSA Hotline for assistance. The failure mileage was approximately 50,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11670475July 1, 2025
SERVICE BRAKES
I was driving pulling an empty small U-Haul trailer and attempted to pull in to a fuel station when my brake became impossible to depress. I barely was able to miss hitting gas pumps and ran down into a ditch before the truck stopped. I informed the dealership where I had just purchased this truck used. I took it to their service department and I was told there was no issues with the brakes. They had to have this recall bulletin in their computer system yet failed to make me aware or to perform this recall or report it to GM. The problem continues to worsen to the point I am scared to drive it. I almost rear ended another car at a stoplight yesterday because I was unable to depress the brake pedal. I stood on the brake and heard an electronic sound but finally came to a stop.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11670551July 1, 2025
ENGINE, FUEL/PROPULSION SYSTEM
- 6.2 engine lost propulsion & warninng light on dash flashed about 3-5 times. After that the trucks engine completely malfunctioned. When this happened i was traveling at 70mhp on interstate I-69 when the the truck lost power to the engine, steering and power braking. The truck was inspected by a GM dealer and they found the engine had blown & with that it caused damage to the coolant system & to the catalytic converterin which all was replaced at full customer cost. Prior to the engine failure 2 other times it lost power and had a rough ilde and trouble starting . 1st time the dealer could not replacate the issue the next time found a camshaft postioning sensor was bad which was placed at customer cost.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11670598July 1, 2025
ENGINE
Truck is at the Jim Gauthier GMC dealership on Mcphillips in Winnipeg, Canada. Engine endured catastrophic failure and is currently waiting for a new engine.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11670624July 1, 2025
SERVICE BRAKES
Trailer Brake Controller displays message on Dash intermittently that the trailer brakes are disconnected, and after a short pause it will say reconnected. This occurs multiple times a day. This did not occur with my previous GMC. I do have solar panels and Lithium batteries
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11670638July 1, 2025
SERVICE BRAKES, STEERING, BACK OVER PREVENTION: WARNINGS
My 2025 GMC Denali EV has experienced repeated safety-critical issues, including severe torque pull under acceleration, making it difficult to maintain safe lane position and compromising steering control. This behavior persists even after inspection and is documented on video. The vehicle has also had repeated service brake assist faults, including one critical failure at under 6,000 miles and additional incidents that resulted in me being stranded out of state. Additionally, I have experienced ghost braking while reversing, where the vehicle unexpectedly applies brake force even when parking assist features are manually disabled. I have performed comparative testing with an identical Denali EV loaner (same year and build), as well as three dealership test units, all of which exhibited proper steering stability and regenerative braking behavior. My vehicle’s issues are therefore not “normal operation” but clear, reproducible defects that affect both safety and expected vehicle performance. These issues raise major concerns for real-world safety scenarios requiring immediate acceleration (e.g., merging onto highways or avoiding fast-approaching vehicles). My documented comparative evidence and repeated attempts to have the defects addressed have not resulted in a safe resolution.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11670640July 1, 2025
POWER TRAIN
My 2021 GMC Sierra 1500 Diesel Truck is displaying the Check Engine Light which I was told by the local Mount Vernon GMC Dealership is a failed Temperature Control Valve affecting the transmission. I also get a warning message of "Reduced Engine Power". I am told that it is OK to drive the vehicle but at reduced power. The dealership told me they ordered a replacement part which is covered under warranty on May 7, 2025, but showed on "Back Order". Every time I call to follow up on the status, I'm told it is still on "Back Order", and they cannot do anything to improve the delivery. Why does a customer, owning a "Denali" truck under warranty, can't get the problem resolved? I have a recall notice from GMC dated January 2025 about this very problem and have shown it to GMC dealerships during regular services, and still have the problem. Since I have bought this truck, I have experienced a failed right running board that cost $1,500 to repair a few months ago which is failing again. The driver side mirror now vibrates when I put the truck into drive after being in reverse, and I cannot get any idea on when this transmission valve problem will be fixed which is causing me serious delays in using the truck to pull a trailer. Prior to this problem I had the dealership replace my brakes which required 2 follow-up repairs due to the "GMC original rotors" being warped that required machining to make them not vibrate which to me, now makes them "used". This means I paid full price for "repaired" parts! I thought that by buying a GMC "Denali" 1500 Sierra truck I was buying the "top of the line" in pick-up trucks but now finding out it's a lemon. I love the truck, but not the problems. What do I need to do to get this fixed? [XXX] [XXX] 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
#11670664July 1, 2025
ENGINE
Engine defect where engine can fail during travel. There is no known solution or proper notice given to me of any kind.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11670408June 30, 2025
STRUCTURE:BODY, UNKNOWN OR OTHER
Tailgate switch Tailgate opened on its own with trailer attached while driving damaging the top of my tailgate. No notification inside cab. No console / fob / tailgate buttons were pushed. Discovered tailgate was down after I arrived home and had done a wide u-turn in my back yard. So far dealership has done very little diagnostic wise. Two trips to dealership so far with little to no results. Now I’m scared to use my trailer or utilize the bed of the truck to haul anything due to tailgate might open on its own at 75 mph on a major interstate/ 2 lane road hurting or killing the people in the vehicles behind me. Totally unacceptable from GMC / dealer for a 70k truck.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11670189June 30, 2025
UNKNOWN OR OTHER
I washed my truck on a Saturday and as I was driving later that morning my tailgate opened while in transit. I did not notice this until I had stopped. After a little digging I found the 2019 tailgate electric switch is prone to this problem when it gets wet. There were no warning lamps for this problem.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11670235June 30, 2025
TIRES:TREAD/BELT, TIRES, TIRES:SIDEWALL
LT275/65R20 While driving Westbound on I87/US64/US264 at the on ramp of US64 business at highway speeds, the driver’s side rear tire tread de-laminated from the belts of the tire. Observed the entire tread airborne in rear view mirror. Pulled over to shoulder and observed for damage to other vehicles, no vehicle was hit but drivers did have to make evasive maneuvers to avoid debris. Tire remained at required PSI, thus did not deflate. Drove vehicle ¼ mile to ** exit to look for safe parking. Called AAA and had vehicle towed to residence. No police report filed. Reported incident to insurance agent in the event of a subsequent damage claim by other drivers. Tire was inspected by ** Tire and confirmed tread had indeed de laminated from tire core. Clear failure of factory tire mounted on factory wheels with no suspension or drive train modifications. Vehicle was totally stock at time of the incident. The safety of the other drivers on the road could have been significantly impacted had the tread hit their windshield or front tire. The violence of the tire separation was similar to an impact with large road debris. The vehicle suffered significant damage to the drivers side truck bed, bumper, sensors and wheel-well. Local tire company confirmed failure mode of tire. Vehicle had received required annual NC State safety inspection, by certified inspection station, including tires on April 30, 2025. There were no warnings prior to incident, visual or audio. The tire(s) involved are available for inspection, as owner has retained all 4 tires at time of replacement.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11670237June 30, 2025
POWER TRAIN
I was going camping and pulling a small 20 ft trailer with my spouse and 4 young kids in the car when the truck stopped accelerating and would not go over 30 mph on the freeway and the fan started running. There was no warning light on the dash. I was then stranded 2 hour from home with my kids in a gas station parking lot and had to have the truck and trailer hauled home.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11670317June 30, 2025
STRUCTURE:BODY
The chrome grille deflector detached yesterday while on the interstate and landed in traffic behind me. GM recall number N242490120 does not cover my vehicle, but the same thing is happening to newer models. GM says they won't cover my vehicle under the recall. Can this recall be extended to newer models?
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

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