GMC Sierra Complaints

15,732 consumer complaints on file.

#11744992June 18, 2026
UNKNOWN OR OTHER
The problem is in the power-locking manual tailgate’s exterior release switch assembly. Water intrusion into the switch can cause a short circuit, leading the tailgate to unlatch while the truck is in Park. Once moving, momentum and air pressure can cause the tailgate to open further, potentially dumping cargo onto the road and creating a hazard.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11745029June 18, 2026
POWER TRAIN, ENGINE
The contact owns a 2022 GMC Sierra 1500 Denali. The contact stated that the VIN was not included in NHTSA Campaign Number: 24V797000 (Power Train). While the contact’s husband was driving 55 MPH, the vehicle stalled, the rear wheels locked up, and the vehicle decelerated until coming to a full stop. The engine warning light was illuminated. The contact stated that the vehicle was towed to dealer and was diagnosed with transmission control valve failure. The vehicle was not repaired. The contact associated the failure with the recall. The manufacturer was made aware of the failure. The failure mileage was approximately 80,400.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11745082June 18, 2026
LATCHES/LOCKS/LINKAGES
The contact owns a 2024 GMC Sierra EV. The contact stated that while operating the vehicle the front trunk had erroneously opened. During the failure the vehicle would not shift out of the park position and the warning message indicating that the door was unsecured had displayed. The contact indicated that the failure had occurred on multiple occasions and the battery was disconnected to reset the system and correct the failure. The cause of the failure was not determined. The manufacturer was notified of the failure. The local dealer was not yet contacted. The failure mileage was 15,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11745145June 18, 2026
ENGINE
My vehicle began exhibiting symptoms consistent with a failed Engine Coolant Flow Control Valve. The check engine light illuminated, and diagnostic testing indicated a fault related to the coolant control valve system. In addition, I experienced abnormal cooling system operation, including the engine cooling fans continuing to run after the vehicle was shut off. Vehicle was tested few times in Auto Zone These symptoms affected the normal operation of the vehicle and are consistent with the condition described in Special Coverage N252508341. Based on the diagnostic findings and vehicle symptoms, I believe my vehicle qualifies for coverage under this program. I respectfully request that my vehicle be inspected and evaluated under Special Coverage N252508341 and that any eligible repairs be performed according to the terms of the coverage program.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11745158June 18, 2026
ENGINE
While driving at night, a low oil pressure warning light illuminated on the dashboard. The following morning, I checked the oil level using the dipstick, which indicated a normal reading. Based on this, I proceeded to drive the vehicle. Shortly after departing, the engine began knocking severely. I immediately stopped and returned home. The vehicle was towed to a GMC dealership for diagnosis. The dealership determined that the engine had experienced catastrophic failure and required complete replacement. I was quoted $11,000 for the repair.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11744736June 17, 2026
POWER TRAIN, ENGINE, FUEL/PROPULSION SYSTEM
While driving my vehicle, the engine and transmission lost power and the check engine light came on. The vehicle went into limp mode and engine propulsion was limited. Had I been traveling at a faster speed, this would have been very unsafe. After coming to a stop, placing the transmission in reverse did not move the vehicle and there was a grinding noise. I was able to savely move forward in limp mode, but the shifting was harsh. I was able to find an empty parking lot to safely park. The truck was towed to Jim Winter dealership in Jackson MI for inspection.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11744867June 17, 2026
ENGINE AND ENGINE COOLING
The contact owns a 2024 GMC Sierra 1500. The contact stated while driving 70 MPH at night, the message “Press Engine Start Button” was displayed, and the vehicle lost power. The vehicle was coasted to an exit ramp. The contact stated that after coming to a complete stop, the vehicle started to operate as intended. The vehicle was serviced under NHTSA Campaign Number: 25V274000 (ENGINE AND ENGINE COOLING); but the recall repair failed to fix the vehicle. The contact stated that the failure had occurred after the recall repair was performed. The manufacturer was notified of the failure but offered no assistance. The failure mileage was 24,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11744883June 17, 2026
ENGINE
On [XXX], my 2019 GMC Sierra 1500 Denali equipped with the 6.2L engine suffered a sudden loss of power while driving. The vehicle lost propulsion and could not continue operating normally. The vehicle was taken to Orange Buick GMC in Orlando, Florida. The dealership advised that the engine is locked and unable to rotate manually, and that the engine requires replacement. The vehicle has approximately 126,000 miles. This failure occurred while the vehicle was being driven and created a safety concern due to sudden loss of propulsion. A sudden engine lockup or loss of power could increase the risk of a crash, especially if it occurs in traffic, at highway speed, while turning, or while crossing an intersection. There was no crash, fire, injury, or death. The vehicle remains at the dealership awaiting repair. 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
#11744588June 16, 2026
ENGINE
The contact owns a 2020 GMC Sierra 1500 Denali. The contact stated that while parking the vehicle, there was an abnormal grinding sound coming from the engine. There was no warning light illuminated. The local dealer was contacted about the failure; however, the vehicle was not diagnosed or repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 98,500.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11744605June 16, 2026
ELECTRICAL SYSTEM, FUEL/PROPULSION SYSTEM, POWER TRAIN
Have been driving it on four separate occasions and the engine will start running rough and shut off leaving me with no power brakes or power steering. Once when I was going about 30 miles an hour the other three times when I was coming to a stop with a trailer on just took it in Kendall Chevrolet for the first time they are still working on it but unable to duplicate the problem this is a very serious safety concern for myself and possibly for others that have the same issue
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11744628June 16, 2026
POWER TRAIN, FUEL/PROPULSION SYSTEM, ELECTRICAL SYSTEM
So I made an appointment to have my truck recalled and the Wednesday before I took it, and it cranked no start and I called the dealership. Ask if they had any other those like this and they said that it could be the fuel injector module and so I got it to a mechanic shop to read the codes and it gave me a code p062b and I asked the dealership to look into it and they never figured out what we were not wrong. I just testing the battery. Well, then I got it back after the recall was done and new transmission valve body put in and about 30 miles down the road it started to shake violently and had a flashing engine light so I got it home called the dealership the next morning because they were closed set up another appointment got it to the dealership dealership said it had a couple misfires but since it wasn’t over 100 they weren’t concerned even though I’m pretty sure it is related to the fuel model going out because it has been cranking rapidly whenever I try to start it, but they won’t do anything to figure out what’s wrong?
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11744393June 16, 2026
ENGINE
The engine blew
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11744447June 16, 2026
ELECTRICAL SYSTEM, ENGINE
I was driving at 45 mph and all of a sudden the screens went black as if the truck was turned off and the first thing I did was turn on the hazards because I didn’t know if the engine shut off either there was on coming traffic from both my front and back so I was scared my truck shut off 5-7 seconds later the screens turned back on and everything went back to normal but I was scared that my truck just turned off I made the dealership aware of this issue as soon as I pulled over and they said they had a busy schedule and that they would try to have a manager reach out to me to “squeeze me in” Mind you I just got my truck back from the dealership due to electrical issues and service yesterday and not even 24 hours later this happened so I am upset.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11744498June 16, 2026
ENGINE AND ENGINE COOLING
The contact owns a 2021 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed, the reduced power mode and Check Engine warning lights illuminated. The vehicle was taken to the dealer, where it was diagnosed with coolant control valve failure. The contact was informed that the coolant control valve needed to be replaced. The vehicle was not repaired. The contact was informed that the failure was like the failure description in Special Coverage Bulletin: N252508341. The manufacturer was made aware of the failure but provided no assistance. The contact was informed that the VIN was not associated with the Special Coverage. The failure mileage was approximately 58,500.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11744534June 16, 2026
ENGINE
Engine fail due to lifters collapsing, had a really bad lifter on #3 and #2 and cause to chew out camshaft . Needed a new engine and gm didnt wanna honor it warranty only partial .
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11744554June 16, 2026
POWER TRAIN
When pressing on the gas, especially when moderately accelerating, the truck experiences severe shaking, which interferes with acceleration, as well as causing the truck to "jump" when the transmission gear "catches", even while driving. When the truck is at a full stop and the engine is auto off, when it restarts, it does so frequently when it reengages that it causes a physical "jump" in the vehicle, causing the driver's foot to come off the brake pedal. This has been most noticeable since my vehicle hit about 70k miles. I currently have 84k miles. I engaged the dealer and was told the transmission is out of warranty. I see that other GMC Sierra models suffer similar problems and recalls have been issued to GMC that they must repair those vehicles. Despite that, my vehicle is not included in any current recall program.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11744121June 15, 2026
ENGINE
I was driving on interstate 95 at approximately 70 to 75 mph when I lost all power and compromise steering with tractor trailer behind me God willing I was able to pull over to the shoulder. My safety was compromised and I lost all faith in Gmc. My vehicle has been out of service for 27 days at this point while waiting for an engine replacement with no ETA on service. According to Pennsylvania lemon law after 30 days a lemon law claim can be submitted
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11744152June 15, 2026
POWER TRAIN
Issue is with the transmission as it harshly shifts into a low gear when on an incline. This causes me to lock up my breaks as it feels like the truck was rear ended by another vehicle. I’m concerned that this is going to cause an accident. This problem has not been reproduced by the dealer. I’ve taken it to the dealership several times. No warning lamps or messages.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11744192June 15, 2026
ENGINE
Truck starting bottom end knocking noise at 57,700 miles. Engine had the recall done to it for Pico test and passed. Dealership states now it will need a new engine.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11744321June 15, 2026
ENGINE
Engine Coolant Control Valve Position Sensor Minimum Stop Performance, and Chevy recalled this on this same motor and GMC needs to pays for this as it’s a major problem!
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

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