GMC Sierra Complaints

15,732 consumer complaints on file.

#11767454September 28, 2026
ENGINE, ELECTRICAL SYSTEM
The contact owns a 2021 GMC Sierra 1500. The contact stated that while the vehicle was parked, the battery charge indicator to zero. The vehicle lost motive power, and the vehicle was unable to exceed 30 MPH while driving. The vehicle was driven in LIMP Mode. The battery saver mode message was displayed before and during the failure. The vehicle then failed to restart. The vehicle had been repaired a year prior to the failure. The contact's blood pressure became elevated due to the issue. The failure mileage was approximately 98,000.
Crash:
No
Fire:
No
Injuries:
1
Deaths:
0
#11767484September 28, 2026
ELECTRICAL SYSTEM, UNKNOWN OR OTHER
2 issues. The radio will go blank and not work regardless of the method using to listen. Example- Sirius/XM or FM/AM. The vehicle will accelerate/jerk forward/backward dramatically compared to the pressure on the pedal. Scared to let anyone else operate the vehicle to prevent accident. Scared to back up to a camper or trailer because it is unpredictable how far it will jerk. No alerts or warnings. Has been taken to the dealer shop many occasions. Accelerator pedal has been replaced. Transmission reprogrammed. The radio/electronics has been updated on multiple occasions. Still both problems exist. GM has been contacted and there is an open case; however, still not resolved. This issue began when purchased in 2023 and continues in 2026. Neither the dealer nor GM seem to have a solution.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11767573September 28, 2026
ENGINE, ELECTRICAL SYSTEM
6 months after owning it the lifters went bad got them Fixed then they immediately went bad again also bent rods then a day after getting that fixed again the oil pump went bad it was issue after issue
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11767586September 28, 2026
ENGINE
My 2024 gmc sierra 6.2 engine had th recall scope work done on the engine. I was told it passed and they changed the oil to the 0-40. Well apparently that was not the case and the bearings in the drive shaft and whatever holds it together broke.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11767598September 28, 2026
ENGINE, FUEL/PROPULSION SYSTEM, POWER TRAIN
Truck was sold to me and the dealership said the truck did not have the defect and the oil was changed to a thicker oil as a precaution. 4,000 miles later the engine failed, was diagnosed as catastrophic engine failure due to the known recall, and was replaced, new engine is now making the same rod knocking noise.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11767616September 28, 2026
AIR BAGS, ELECTRICAL SYSTEM
Truck has airbag service issues since day 1. I’ve taken to the dealership and they can’t find any issues even though the service safety system continues to appear. Ac issues and charging issues as well. I’ve attached documentation.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11767225September 27, 2026
ENGINE
2026 GMC Sierra 1500 Denali 6.2L , with 3550 miles; started ticking and another mile to get home started knocking, had truck for less than a month, had it towed to the dealer they said will get a new engine, they can't even five me a time frame for the new engine replacement.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11767261September 27, 2026
ENGINE
I purchased this vehicle on May 28th 2026. At that time I was told there were no problems with the 6.2L engine. The problems they have had didn't affect the 2026 Denali 1500 6.2L's. After hearing about numerous 25's and 26's engine failures I decided to have my first oil change at 1540 miles. I asked the dealership to give me the oil filter so I could open it and examine it. I found excessive metal in the filter, indicating to me that the engine is failing. I contacted the dealer, they told me to go to GM Customer service. They told me there is nothing they can do unless the check engine light comes on or there is noise in the engine or it blows up. In which case people have reported traffic hazards getting to the side of the road without power or even the rear wheels locking up. One incident shows the vehicle had a fire and completely burned up. I made a vacation trip without incident and put another 825 miles on the truck, at which time I swapped out the oil filter and opened it up and found more metal particles. Common sense tells me that the engine is self destructing and will at some point fail. The manner in which that happens is the safety issue. I have reported this issue to the dealer and GM and they say just keep driving it. Putting myself and my family at risk. I know I am not the first one to have a bad engine in my new GMC Denali. There are just way too many defective engines in these vehicles to feel safe after buying such and expensive vehicle. Don't get me wrong, I love the truck!! I just would like to know it has a dependable engine to keep me safe while driving it!!
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11767218September 27, 2026
POWER TRAIN, UNKNOWN OR OTHER
I purchased a 2024 GMC Sierra 1500 Denali VIN # [XXX] on XXX with approximately 18,599 miles on the vehicle. The incidents are identified below in order. 1) XXX, Vehicle engine failure while driving at high speeds, with my daughter as a witness. I Reported the incident to Elder Ford on XXX, and my sales associate told me to take it to GMC for factory warranty. XXX took the vehicle to Central Buick GMC they performed a test that found no codes and replaced the fuel Pump Module from past experiences. They let me take the vehicle home. 2) XXX Vehicle engine failure while driving at high speeds, had to get it towed to the dealer for repair. Again, they found no codes. Had it for 5 days. Made me take it home. 3) Picked it up on XXX , was driving home and the same thing happened while going 70+ mph on the interstate. Stalled again. Drove it back to the dealer and dropped it off again, same day on the XXX. 4) Again, they found no codes and made me pick it up on XXX I was driving home on XXX and the same thing happened- lost complete power while going down the road at 40+ MPH. I had to get it towed the same day back to the dealer where it currently is at. 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
#11767221September 27, 2026
ENGINE
2026 GMC Sierra 1500 Denali 6.2L , with 3550 miles; started ticking at 45 MPH and another mile to get home started knocking, had truck for less than a month; no warning lights. I had it towed to the dealer. They said it needed a new engine, no time frame for repair.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11767072September 26, 2026
STRUCTURE:BODY
The chrome grill deflector that was previously fixed under the GM recall (for the same part) broke off and flew into my windshield while driving on the freeway.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11767091September 26, 2026
ENGINE
Excessive oil consumption. I am fearful that my vehicle engine will lock up.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11767126September 26, 2026
ENGINE
With 10000 miles on my 6.2 liter the engine failed. Cause was main bearing failure. Needed full engine replacement.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11767153September 26, 2026
STRUCTURE:BODY
Chrome grille deflector the upper front of grille came off in highway at highway speed hitting windshield scratching hood & car behind.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11766980September 25, 2026
ENGINE
In August, 2019, at 93,672 miles, GM covered a lifter failure on our 2015 GMC Sierra, V8 AFM engine. Only the left side was repaired. Now, in 2026 at 130,000, the right side has the same issue and needs repair. The estimate to repair is $16,697. This is a known issue and a safety concern.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11767003September 25, 2026
ENGINE, ELECTRICAL SYSTEM, FUEL/PROPULSION SYSTEM
Vehicle lost power, seemed to slip while pulling hills, Exhaust brake didn't seem to work. Dealer determined cause by DTC P209. Tested injector circuit, found loose terminal tension at injector number 6 connector. Replaced Cylinder # 6 injector connector. Did have multiple warning lights. Also submitting because Service Bulletin 23-NA+027 covered up to 2023. Believe it's an ongoing issue since vehicle is a 2024.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11766667September 24, 2026
POWER TRAIN
A dealer "fixed" the P20EE code on this date, then the code came back a week later. Same dealer said they don't have qualified diesel technician, took vehicle to a 2nd dealer 9/22/2025, unable to determine cause of code. On 6/18/2026 same P20EE code came on again, took to dealer, dealer able to perform repairs on 7/30/2026 after ordering the correct parts. No on 9/23/2026 P20EE code is back.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11766668September 24, 2026
ENGINE
While slowly accelerating from a stop, with 4 family members in the truck, the engine began to run rough for about 1-2 seconds then multiple notifications flashed across the dashboard (Check Engine, Steering Assist is Reduced-Drive with Care, Service ESC, and Service Parking Brake). The road we were on was steep and twisty and did not have room to pull over which put us in an unsafe position with compromised steering and no shoulder. We made it 2 miles home but there was smoke coming from the exhaust and the engine ran very rough. Truck was towed to my mechanic. Mechanic confirmed issue. Diagnosis was misfire in #5 cylinder, confirmed initial compression upon startup (1 second) then compression loss and cylinder full of oil due to failed lifter. No previous issues prior to failure.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11766683September 24, 2026
ENGINE
2026 GMC Sierra SLT with 3.0 Duramax diesel engine. While driving down the road with the cruise set to 55 MPH on 8/29/26, the engine started to run rough. I slowed down, but this did not seem to help; I sped up, and the problem persisted no matter what I did. Service traction control and service ESC displayed on the dash. I drove to the dealership; their service department was closed because it was Saturday. I took my salesman for a ride so he could witness the issue firsthand. He confirmed something was not right, and they put me into a loaner vehicle. The truck has 848 miles on it. Service diagnosed it as a fuel issue in cylinder 2, replaced the injector, but the issue did not go away. GM TAC team advised replacing the motor; that is what I am currently waiting on. The dealer has the motor and is awaiting the install.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11766690September 24, 2026
ELECTRICAL SYSTEM, ENGINE, FUEL/PROPULSION SYSTEM
The vehicle experienced a loss of engine power accompanied by a check engine warning light and a “Reduced Acceleration”/reduced-power condition. The exact component causing the malfunction has not yet been determined. The vehicle and any affected components are available for inspection upon request. While driving the truck uphill toward our residence, the vehicle lost significant power and had difficulty maintaining acceleration. The truck stalled several times. The sudden loss of engine power while driving on an incline created a safety risk because the vehicle was unable to maintain normal acceleration and could potentially have stopped in traffic or created a hazard for other vehicles. The problem has not yet been confirmed or reproduced by a dealer or independent service center. The vehicle has experienced the problem while being driven, including the reduced-acceleration condition and multiple stalls. The vehicle will be inspected by a GMC dealer on Monday, September 28, 2026. The check-engine warning light illuminated, and the vehicle displayed a reduced-acceleration/reduced-power condition. The truck subsequently experienced significant loss of power while traveling uphill and stalled several times. These symptoms first appeared on September 14, 15, 22, and 23, 2026.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

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