GMC Sierra Complaints

15,732 consumer complaints on file.

#11694308October 18, 2025
ELECTRICAL SYSTEM
This truck needs 2500.00 in work to replace Electrical Harness after months of problems and evaporating leaks.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11694024October 17, 2025
ELECTRICAL SYSTEM, POWER TRAIN, STEERING
Driving in town going 20mph and the truck shut down not allowing for braking or gas and the steering locked up. Placed the vehicle in neutral, shut the truck off and turned it back. Was able to continue driving. Attempted to have the dealership we bought it from run a diagnostic and the battery was replaced but it continues to shut down at random times. Took the truck to a local auto shop after this happened again, another diagnostic was run, I am waiting the report to confirm what was done.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11694051October 17, 2025
ENGINE
The engine failed completely while driving. On the day of the incident, I started my 2020 GMC Sierra 1500 AT4, and immediately upon cranking, the engine began knocking loudly. I shut the vehicle off right away to prevent further damage and called a wrecker service to have it towed to Marianna Chevrolet, GMC. No warning lights or messages prior to the incident. The weather was clear and dry, and the truck was parked on level ground at the time. There were no prior warning lights, leaks, or unusual noises before this event. The vehicle has been well-maintained, with oil changes performed regularly every 4,000 miles at a local auto shop (though receipts are not available). The brakes were replaced earlier in 2025. Marianna Chevrolet, GMC inspected the vehicle and estimated the repair cost at $12,700 due to what appears to be a major internal engine failure.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11693732October 16, 2025
EXTERIOR LIGHTING
Backup camera is not usable at night, you cannot see anything on the camera unless it is a brightly it area. This causes safety concern for people and property. Dealer confirmed no issues with the camera and that is how it is. Had to add external light to ensure I could see at night.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11693775October 16, 2025
ENGINE
The engine seized and locked up leading to a catastrophic failure of my three month old 2025 GMC Sierra Denali at approximately 3,181 miles. The engine, the 6.2L V8, was listed as a recall engine by GM for model years 2021-2024. My 2025 allegedly "passed inspection" yet had the same catastrophic failure. The vehicle engine made loud noises and it sounded like parts were breaking. The vehicle no longer starts and had to be taken via flatbed to the dealership where I was informed the engine had to be replaced.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11693845October 16, 2025
STRUCTURE:BODY
Known defect with 2019 and now 2020 GMC sierra trucks. Design was updated for 2021+ which has corrected the seal failure defect. GM has issued a service bulletin to dealers about how to repair the problem. Back window is leaking water. Defective seal noted by GM. GM is only covering the cost of repair if. Vehicle is still under 3/36 warranty. If outside your warranty cost from dealer to owner is $2500 to $6000. A known design failure GM recognized and took steps to change the design for future. Vehicles but will not stand behind vehicles that have this defect. Would like the cost to the repair fall back to GM to cover. Bulletin # 18NA383 [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
#11693863October 16, 2025
ENGINE AND ENGINE COOLING
See attached document for complaint.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11693972October 16, 2025
ENGINE
I do not have an official communication from the dealer who is servicing my vehicle. However, they have had my vehicle for almost 3 weeks and they tell me that the engine has failed and needs complete replacement. They said the engine lost compression and quit running, it now cranks and does not start. Although the engine has not been disassembled we believe the point fo failure to be in the rotating assembly of the bottom end of the engine.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11693509October 15, 2025
ENGINE
43000 miles 2020 gmc sierra with lifter engine issues. Oil change made every 3k miles
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11693514October 15, 2025
UNKNOWN OR OTHER
trailer brake control is junk, it is a known problem! While driving the control shut of the brakes of the trailer. Had a fully loaded trailer 14,000 pounds with no trailer brakes, ended up going through red light, because the trucks brakes where not enough to stop trailer!
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11693556October 15, 2025
UNKNOWN OR OTHER
Gridlines on the backup camera work intermittently when backing. The issue has been occurring since taking delivery. 20 June 2024. The dealer has made (3) attempts at repairing and has not resolved the issue. A Buy Back request was submitted 9/2025 and denied. GM advised it is a known problem they are working on. Back up cameras with gridlines became a mandatory safety feature in 2018.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11693652October 15, 2025
POWER TRAIN
The contact owns a 2020 GMC Sierra 1500. The contact stated while driving approximately 40-60 MPH, the transmission hesitated while depressing the accelerator pedal. A dealer was contacted. The vehicle was taken to the dealer and was diagnosed with transmission control module (TCM) failure. The contact was informed that the TCM needed to be replaced. The vehicle was not repaired. The contact related the failure to NHTSA Campaign Number: 24V797000 (POWER TRAIN); however, the VIN was not included in the recall. The manufacturer was notified of the failure and referred the contact to the NHTSA Hotline to report the failure. The failure mileage was 75,200.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11693701October 15, 2025
POWER TRAIN
Transmission failed at 110k miles roughly. Safety was put at risk due to this happening on a highway. Yes, transmissiom was replaced by a local repair shop, the means of failure was identical to thousands of vehicles in this model year failing prematurely. No it wasnt inspected by the dealer. No there was no warning light, we were going up a hill and it failed.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11693232October 14, 2025
UNKNOWN OR OTHER
The retractable running board on the driver side retracted well my 3-year-old daughter was climbing into the back of the truck. She then fell off and to the ground. On more than one occasion, I was standing on the retractable running board on the driver side. I was buckling my daughter up in her car seat. The running board retracted in without me doing anything. I did not touch the door and had the driver's side driver door and passenger door open at the same time. This has also happened when just the passenger door was open. The running board retracts and knocks my shins into the truck body. This is quite dangerous and could easily cause great harm. I am not the only one with this issue and have read numerous complaints in online forums. I came across a potential remediation of the problem in an online forum. That remediation included disconnecting the rear toes switch that moves the running board towards the back of the truck, allowing a person to easily reach items that have slid all the way to the front of the bed. Since I disconnected that I have not had a problem with the driver side running board. The passenger side running board is not exhibiting this behavior. For clarity, the running boards are the factory installed running boards, not an aftermarket running board. Please get GM to fix this blatantly obvious safety concern. Thank you very much.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11693238October 14, 2025
ELECTRICAL SYSTEM
LED instrument cluster goes blank. No speedometer, no fuel gauge, oil gauge, nothing.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11693313October 14, 2025
ENGINE
6.2L V8 engine in 2020 GMC Sierra 1500 AT4 suffered two lifter failures, which damaged crankshaft and sent metal shards throughout engine and oil. Total engine replacement required. This issue is subject to a recall for 2021 - 2024 model years and the recall should extend to 2020 model years. Vehicle was traded without functioning engine at a significant loss in value for new vehicle, and is not available for inspection. Vehicle was inspected by service department at GMC dealership and traded to a different GMC dealer. No prior indications of problems or warning lights until engine failure occurred while driving.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11693333October 14, 2025
STEERING
The contact owns a 2019 GMC Sierra 1500. The contact stated that occasionally, while driving approximately 57 MPH, the vehicle violently shuddered, causing the steering wheel to become difficult to turn in either direction. No warning light was illuminated. The vehicle was taken to a local dealer, where it was determined that the driver’s and passenger’s side front tires needed to be replaced. The vehicle was repaired; however, the failure reoccurred. The vehicle was taken back to the same local dealer where it was diagnosed; however, the cause of the failure was not yet determined. The manufacturer was made aware of the failure. The failure mileage was approximately 13,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11693346October 14, 2025
POWER TRAIN
Torque converter in my transmission we out, causing my gears to grind and lose power. Slight rumbling sound under the front passenger seat, First dealer (Palmen Motors, Kenosha WI) told me there was nothing wrong with the vehicle and no transmission error codes exist. Second dealer (Parks GMC, Greenville SC) indicated that i need a complete new transmission. Part is on backorder for the last 4 weeks and I am without my vehicle. No ETA for new part or any information on why it failed prematurely.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11693351October 14, 2025
SEAT BELTS
The contact owns a 2015 GMC Sierra 1500. The contact stated the front passenger’s seat belt was difficult to buckle, and it recently started unbuckling while a passenger was seated in the passenger’s seat with the seat belt buckled. The contact stated that when the seat belt was unbuckled, the seat belt warning light was illuminated. The contact had not taken the vehicle to a local dealer or independent mechanic to be diagnosed or repaired. The manufacturer was informed of the failure and referred the contact to the NHTSA Hotline to report the failure. The failure mileage was approximately 170,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11693377October 14, 2025
POWER TRAIN, VEHICLE SPEED CONTROL, ENGINE
DTC CODE P1098 PRESENT RELATED TO FAULTY COOLANT CONTROL VALVE ON 3.0 DURAMAX DIESEL ENGIINE. THIS IS A KNOWN ISSUE WITH THIS ENGINE AND IS SUPPOSED TO BE COVERED UNDER THE 100K MILE POWERTRAIN WARRANTY. PREVIOUSLY TOOK VEHICLE INTO DEALERSHIP FOR REPAIR INVOLVING REPLACEMENT OF THE COOLANT CONTROL VALVE BUT WAS TOLD REPROGRAMMING OF THE ECM WAS REQUIRED FIRST STEP PER GM REPAIR BULLETIN. REPROGRAMMING COST ME $195 AND WAS TOLD THIS WAS NOT COVERED UNDER THE 100K POWERTRAIN WARRANTY. NOW, A FEW MONTHS LATER, THE SAME ISSUE AND DTC CODE P1098 HAPPENED AGAIN WHILE DRIVING ON FREEWAY AT FREEWAY SPEEDS AND CAUSED VEHICLE COMPUTER TO LIMIT SPEED OF THE VEHICLE WHICH CAUSED HAZARDOUS SITUATION IN CONSTRUCTION ZONE AS WAS NOT ABLE TO MAINTAIN SPEED OF TRAFFIC WHILE TOWING TRAILER WITH BOAT. I ALSO UNDERSTAND THAT GM HAS ISSUED SPECIAL EXTENDED WARRANTY RELATED TO THIS COOLANT CONTROL VALVE IN SEPTEMBER 2025 WHICH EXTENDS THE WARRANTY COVERAGE UP TO 15 YEARS AND/OR UP TO 150K MILES BUT I WAS TOLD AT THE DEALERSHIP THAT MY VIN# DOES NOT QUALIFY FOR THIS EXTENDED COVERAGE FOR SOME UNKNOWN REASON?
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

← Back to GMC Sierra