GMC Sierra Complaints

15,732 consumer complaints on file.

#11657497April 29, 2025
ENGINE
I had purchased a 2021 GMC Sierra equipped with the 6.2 liter motor in October of 2021. Within two weeks, my engine was experiencing problems. There was no service lights on the dash, and my truck suddenly shut off while on a busy road. I was able to coast to the side of the road, however it was a driving lane with no shoulder which made the situation dangerous. I was able to restart the engine after some time, and eventually get the vehicle off of the roadway, thankfully I got out of the driving lane without being struck by another vehicle. The truck had approximatley 1000 miles at this time and was brand new. I ended up needing a complete engine replacement due to failed crank bearings and connecting rods. I was told it was a crankshaft issue. After the complete motor replacement, sometime during the next year I was experiencing oil burning issues. On this second motor, a GM dealer had to completley rebuild the top end of the motor and install new piston rings. This is now a total of two motor failues in under 30,000 miles.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11657506April 29, 2025
STRUCTURE:BODY
Upper grille came off and fractured windshield while going down the highway it is a non serviceable part by GM which I believe is strategic seeing that they’ve had issues with earlier models of the the truck you have to buy an entire replacement grille for one issue that shouldn’t be happening was never able to locate part, I assume plastic grille clips dry rotted noticed the part lifted a bit before the entire part failed thought someone was trying to break into my truck . The wind while going down the highway caused them to fail, I’ve seen multiple GMC sierras with the same grille issue, I uploaded before and after pictures of how the truck looked before and after pictures .
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11657509April 29, 2025
ENGINE AND ENGINE COOLING
The contact owns a 2020 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed, the low oil warning light illuminated even though an oil change had been performed within 1,000 miles. The vehicle was taken to the dealer, who diagnosed a failure with the piston O-rings, resulting in damages to the engine. The vehicle was not repaired. After investigating the failure, the contact related the failure to NHTSA Action Number: PE25001 (Engine and Engine Cooling). The manufacturer was notified of the failure but provided no assistance. The failure mileage was 79,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11657513April 29, 2025
ENGINE
On April 23rd, while traveling, I began hearing a loud, metal on metal knock. My truck began to lose all pulling power. I had no engine warnings, no check engine lights or any other indicator of engine trouble. I pulled to the side of the road and exited the vehicle. It was then I realized it was my engine making the noise. I have since had it towed to the dealer where it sits while I wait to hear back from the service department a final diagnosis. I was told this was most likely a rod or bearing. On Friday April 25, I was told of the recall. I was told I would probably need a new engine but they haven't been instructed on what the next step would be from GM.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11657522April 29, 2025
POWER TRAIN
The transmission is jerking and sometimes it will not shift enough to get out of others ways. Severe slippage in the transmission I have taken the truck to the shop 3 times for the same issue. Now they tell me I need a new transmission.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11657524April 29, 2025
ENGINE
The contact owns a 2015 GMC Sierra 1500. The contact stated while driving approximately 50 MPH, the vehicle started to lose motive power and then stalled. The contact stated that there was a black cloud of smoke coming from the exhaust pipe. The check engine warning light was illuminated. The contact had the vehicle towed to an independent mechanic. The vehicle was diagnosed, and it was determined that the rod bearings had failed and needed to be replaced. The vehicle was not yet repaired. The manufacturer was not informed of the failure. The failure mileage was approximately 122,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11657568April 29, 2025
ENGINE
The contact owns a 2015 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed, the vehicle stalled with the check engine warning light illuminated. The vehicle was able to be restarted. The vehicle was taken to an independent mechanic, where it was diagnosed that the engine had failed and needed to be replaced. The vehicle was not repaired. The vehicle was taken to the dealer, where the diagnostic result was confirmed. The contact was informed that the engine needed to be replaced. The vehicle was not repaired. The manufacturer was made aware of the failure. The failure mileage was approximately 97,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11657583April 29, 2025
ENGINE
Engine issues at 35000 37000and failure at 65000 miles V8 6.2 L engine. Cans and lifters replaced at $6100 GM refused to cover. Car immediately traded in for 2024 Silverado same occurrence on exit ramp 15000 miles engine replaced this year under warranty. Would like recall extended warranty to 2019 or before and be reimbursed for $6100 at a minimum
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11657587April 29, 2025
ENGINE, FUEL/PROPULSION SYSTEM, ELECTRICAL SYSTEM
While exiting the highway and transitioning into a turn lane, my 2024 GMC Sierra AT4 (with 12,887 miles) suddenly and completely shut down without any prior warning. All vehicle systems—including electrical—failed simultaneously. This included the dashboard, steering assistance, and emergency lights, which significantly compromised my safety. I was unable to alert surrounding drivers or move the vehicle out of the traffic lane. There were multiple cars behind me, and I was placed in an extremely unsafe situation due to the sudden loss of control and inability to signal or restart the vehicle. I immediately contacted emergency services, and a police officer arrived approximately 10 minutes later to assist. Roadside assistance later pulled diagnostic code P0016 from the truck’s computer. I have since learned that this code corresponds to a known engine timing defect and is the subject of a recent GMC recall issued just days prior to the incident. The failure occurred without any warning lights, messages, or symptoms beforehand. The vehicle is now with a GMC dealer and is available for inspection upon request. To my knowledge, the issue has not yet been independently confirmed, but I believe it is directly connected to the recalled component.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11657604April 29, 2025
ENGINE
The contact owns a 2020 GMC Sierra 1500. The contact stated that while attempting to start the vehicle, the vehicle failed to start. There was no warning light illuminated. The contact pushed the vehicle out of the garage. The vehicle was towed to a dealer where it was diagnosed that the spun bearing had failed. The contact was advised that the engine needed to be replaced. The engine was replaced. The contact stated that recently there was an abnormal sound coming from the engine. The vehicle was not diagnosed or repaired after the most recent failure. The manufacturer was not made aware of the failure. The failure mileage was approximately 40,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11657614April 29, 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 not yet available. The local dealer was contacted and confirmed that 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
#11657636April 29, 2025
ENGINE
First engine blown 31,904 miles, Lifter failure. Replaced with re-manufactured engine. Second engine failure at 68,000 miles, Piston rod failure. Piston blew thru engine block and engine bay caught on fire.
Crash:
No
Fire:
Yes
Injuries:
0
Deaths:
0
#11657654April 29, 2025
ENGINE
Engine 6.2 liter needed to be replaced. Connecting rod and the engine froze up.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11657662April 29, 2025
ENGINE
I wanted to reach out to see if there is anything in addition to the lemon law. I bought a 2021 GMC Sierra with 38,000 miles on it around March of last year. There was a motor defect which was covered by the warranty. I was driving and it stopped in the middle of the road so I had to safely maneuver out of the main road. The truck was towed to my house with 45,184 miles on it, until the GMC dealership could take it in to inspect. They did take a while to get me a rental because everything was backed up. They said they could rent me out a truck due to not being their brand and that it only covers a certain amount. It got taken in by the dealership on 7/15/2024 and ended up getting the truck back repaired on 8/27. I did get the truck back and have been having it, I am just worried about it breaking down or anything of that nature. I just wanted to know if there is any further process I should do or since they repaired it there should be no issue.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11657672April 29, 2025
ENGINE, POWER TRAIN, UNKNOWN OR OTHER
I have taken it in due to engine mounts 4 different times, transmission replaced and in October 2024 I took it in for issues I was experiencing like I had before my transmission went out. I did not get my truck back until almost Dec 2024 and that was due to there employee backing into the front end of my truck. So after all that my warranty was up Dec 24 2024 and then on April 16th 2025 I was driving my 2018 GMC Sierra 6.2l 1500 Denali 129,600 miles at approx 30 mph it was late so the streets were empty and we started to hear a knocking or what I thought at the time was a very bad exhaust leak. We parked and then we started to try to make it home very slowly which we did and it was not making to much noise. The next day I called GMC and explained they said bring it in. I towed it there to be safe but it did start and still ran at very slow speed. They called me and said that the lift side rockers/ lifters 1 failed and it was stuck due to a misfire and that the engine would need to be rebuilt and sent me over some very vague break down which looked like a lump sum price. I requested and better break down and got a screen shoot and that when he said that’s the best they can do. There were no engine lights on or warnings nothing at all. It also just got serviced at GMC for an oil change on February 27th 2025 along with some air filters. Today is April 29th and still waiting for the service manage to call and see if they can do anything to help out instead of charging full price. I will Attach pictures of the cost break down if possible. Thank you
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11657140April 28, 2025
SERVICE BRAKES
Brake monitor repair keeps illuminating since 2/1/2025! Replaced all brakes and rotors, yesterday 4/27/2025. now don't drive over 43 mph illuminates, emergency brake illuminates says push brake peddle to disengage parking brake yet parking brake has never been engaged
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11657141April 28, 2025
ENGINE AND ENGINE COOLING
The contact owns a 2021 GMC Sierra 1500. The contact stated that there was an abnormal ticking sound coming from the vehicle while idling. There was no warning light illuminated. The vehicle was taken to an independent mechanic to be diagnosed. The contact was then notified of NHTSA Campaign Number: 25V274000 (Engine and Engine Cooling); however, the part to do the recall repair was not yet available. The local dealer was not made aware of the issue. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was made aware of the issue. The failure mileage was approximately 33,000. VIN tool confirms parts not available.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11657169April 28, 2025
STRUCTURE:BODY
At approximate 36700 miles. Upper top molding piece next to the grill, flew off while driving down the highway at 75mph hit my windshield and cracked it. Lucky no one was flowing me. This is the second one that's has broken. The first time was driving in South Dakoda the day after I purchased the truck and one side broke so I was able to stop at a truck stop and duck tape it until I was able to take it to the dealer. This seams to be a flaw, because read this has happen to multiple truck of the same model.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11657179April 28, 2025
ENGINE, POWER TRAIN
1. Vehicle automatic transmission failed during routine highway driving. Significant drivetrain vibration and limited gear availability. Warning lights included: ESC. - Electronic Stability Control TSC - Traction System Control Emergency Brake Fault light Power Steering assist reduced Flashing Yellow Engine Warning light. 2. White exhaust smoke upon arrival at GMC dealership. GMC technician advised full diagnostic would be required to assess extent of transmission failure and cause of white exhaust smoke. Service technician subsequently communicated that the engine was “failed” and would have to be replaced. Vehicle could not be driven and so full extent of transmission failure could not be assessed UNTIL ENGINE IS REPLACED!?!
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11657198April 28, 2025
ENGINE
Coolant Control Valve malfunction causing fan to go on high. After several starts, engine light goes away but comes back sporadically. Safety issue is that when the light comes on it reduces the engine acceleration mid-drive. Coolant temp is normal but control valve is causing fan to turn on and reducing the engine acceleration.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

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