GMC Sierra Complaints

15,732 consumer complaints on file.

#11705776December 18, 2025
ENGINE AND ENGINE COOLING
The contact owns a 2024 GMC Sierra 1500. The contact stated that while driving approximately 70 MPH, the vehicle started losing automotive power and stalled. The contact frantically maneuvered the vehicle across three lanes of highway traffic to get to the right shoulder and park the vehicle. During the failure, the check engine warning light and several other unknown warning lights illuminated. The vehicle was later towed to the local dealer. The cause of the failure was not yet determined. The manufacturer was also notified of the failure. The contact had previously received a letter regarding NHTSA Campaign Number: 25V274000 (ENGINE AND ENGINE COOLING). The contact stated that the vehicle had experienced the failure listed in the recall. The failure mileage was 48,301.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11705815December 18, 2025
FORWARD COLLISION AVOIDANCE: WARNINGS
Picked up vehicle from Dealership new, with 12miles on the odometer. During the trip home (over 150+ miles each way) and at 54 miles a "Forward Collision System Unavailable" warning message appeared on the dash. Stopped for coffee and restarted the vehicle and the error cleared. It re-appeared at 235 miles, and again at 427 miles along with an OBD error P0700 @cycle#763, Occurrence Cycle #2608. Returned the Vehicle to the dealership service department for repairs. The vehicle was returned and we took the truck on our first trip to Yosemite and while driving it the cruise control released the throttle times driving on a 4 lane Hwy 152. Then on the backside of Pancho Pass we entered the town of Los Banos. While driving in a 45 MPH section of Hwy 152, with no other cars in front or behind us, the truck performed an emergency stop. It applied the brakes at maximum force causing the front to dive hard and the rear tires to lose traction with the antilock cycling the brakes on and off, causing them to slip bringing the truck to a stop. At no time did the dash or the HUD display flash the collision warning or any error messages, I applied throttle and moved the Truck off the Hwy to the side of the road. Checked all pages on the dash for any indication of problems, and we drove to a parking lot inspecting the truck top to bottom to see if there were any obstructions, damage to the bumper sensors, or windshield. Returned the Truck to the dealership a second time for repairs. Received the vehicle back and during the drive home we Stopped for Dinner in San Jose and the "Forward Collision System Unavailable" returned again. Returned the vehicle for service a third time and notified Manufacture of the issues.This is a Major safety defect that GM cannot seem to repair. Current mileage of vehicle 3098.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11705821December 18, 2025
ENGINE, FUEL/PROPULSION SYSTEM
Fuel management system caused a lifter to fail (stuck) which resulted in camshaft damage at 77,611 miles. GM refused to cover the repair, although there is a pending class action lawsuit against GM for this very issue. Truck was repaired at a GM dealership - Sunrise Collierville, TN. Repair costs was approximately $7,000. This occurred during a 2.5 hour road trip which put lives at risk. The truck began to vibrate, and the check engine light came on. There was no other warning before the failure occurred. No police or insurance were involved. This occurred on 9/27/25. It took the dealership 32 days to diagnose and repair the issue. Thanks.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11705917December 18, 2025
ENGINE
FOR THE LAST YEAR i BURN BETWEEN 2 - 3 QUARTS OF OILL BETWEEN OIL CHANGES. DEALER KEEPS TELLING ME THIS OS NORMAL. I KNOW IT IS NOT NORMAL AND I'M AFRAID OF ENGING FAILURE WHILE ENGINEERING RECALL IS IN PROCESS
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11705942December 18, 2025
UNKNOWN OR OTHER
Approximately Nov 15, 2024 is when the issue started. At approximately 44,000 miles the truck experienced a catastrophic oil coolant failure causing oil and coolant to mix. It is available for inspection. The incident happened suddenly as the truck was being driven. When pressing on the accelerator, the truck hesitated to move on several occasions. The issue was confirmed by an authorized GMC service center. The truck has been inspected by the authorized GMC service department. The warning light came on after the damage was done. There was no other sign of an issue. It wasn't until the next day when the truck was started, that the warning light appeared. No leaks of any kind.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11706005December 18, 2025
ENGINE
Main bearing failure
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11705563December 17, 2025
VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM:CONDENSOR/EVAPORATOR
The contact owns a 2018 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed, the air conditioning system became inoperable. There was no warning light illuminated. The contact stated that the air conditioning system failed to function properly. The vehicle was taken to an independent mechanic, where it was diagnosed, and determined that the air conditioning condenser had failed and needed to be replaced. The vehicle was not repaired. The dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was not made aware of the failure. The failure mileage was not available.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11705584December 17, 2025
VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM:REAR WINDOW
The contact owns a 2014 GMC Sierra 1500. While the contact's husband was driving at an undisclosed speed, the contact became aware that there was smoke coming from the rear window and the window shattered. The contact stated that the defroster was operating during the failure. The contact stated that the shattered glass had fallen on the contact's minor son, who was seated in the rear seat. The son had not sustained any injuries. The vehicle was not diagnosed or repaired by an independent mechanic or dealer. The dealer was made aware of the failure. The contact was informed that the repair was previously performed and covered under the warranty. The contact was informed that the current repair was not covered under warranty. The contact was advised to contact the NHTSA Hotline to report the failure. The manufacturer was not made aware of the failure. The failure mileage was approximately 156,800.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11705636December 17, 2025
ENGINE
GM installed a 2023 6.2L engine in my 2019 GMC. The engine locked up while I was driving it. It had about 54,000 miles on it. There is a recall on the vehicles with the 6.2 GM engines that were made between 2021 and 2024. However since they installed it in my 2019 they are telling me they won't warrant it because the recall just list the vehicle year and not the motor year. This is not right.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11705645December 17, 2025
POWER TRAIN
Transmission self destructed at 68,000 miles. Had to have it replaced at GMC dealership at a cost of over $7,000. GMC did not offer any coverage of the cost.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11705747December 17, 2025
ENGINE
I brought my 2024 Sierra in for its L87 recall. It passed. Two weeks later I had to bring it in for check engine light. They reset the system under a TSB that is known to occur with the l87 recall. Not a total of 300 miles of passing the recall I was driving and the engine started making a horrible noise and I started experiencing loss of power. I managed to get the vehicle safely parked. The dealer pulled the oil filter and said it had 100% metal contamination in the oil. The filter looked like a glitter bomb went off. It took 3 weeks, they replaced the engine with a remanufactured engine even though I told them new only. They also had to replace the radiator as it was polluted with metal.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11705508December 17, 2025
SERVICE BRAKES
Premature brake pad wear on all Brakes. All break pads worn down and had to be replaced at or before 25,000 miles. No trailer pulling and only light driving. Dealer stated rotors needed to be turned as well due to extremely low brake life.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11705280December 16, 2025
POWER TRAIN
Purchased this vehicle used with having 34k miles. Currently has 37k. Powertrain is still under warranty. I will be taking it in to have looked at. The truck has already been in for rear main seal failure and the dealership failed to investigate the transmission issue as far as I know. The issue is with the transmission and shifting, specifically going into second gear. While going into second gear the truck feels like it is in neutral for a couple seconds then ultimately gets its 2nd gear. This appears to only happen after the truck has been sitting off for some time. Between a few hours and overnight. The biggest concern for me was when this happened as I pulled out into the road and was left without propulsion for a brief moment with oncoming traffic. If driving in snow I feel like once the gear grabs, would likely cause a spin-out in front of traffic. This is a serious safety concern. There are no warning lamps or messages on the dash for this issue. This is a 2022 GMC Sierra Limited Elevation crew cab 2.7L V4 with turbo.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11705288December 16, 2025
SERVICE BRAKES, FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING
My truck braked for a vehicle that was parked on the side of the road. This vehicle was not in my lane or hazardous in any way. I was traveling at highway speed 55 mph and truck braked to 30 mph approximately with no pre warning this has not happened before or after. The truck has about 26k on it.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11705328December 16, 2025
SERVICE BRAKES, ELECTRICAL SYSTEM, FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING
Driving on the freeway going approx 70 MPH and the ABS warning light, and Stabilitrak warning light suddenly turned on. I’m sure you can imagine how panicked I was going that fast on the freeway and having my brake warnings suddenly turn on. Especially with my entire family in the vehicle with me at the time. Could feel a difference when I was attempting to brake and exit the freeway. Had to apply tons of pressure to get the brake pedal to engage. The cruise control would no longer work, and the trailer brake monitoring system also began flashing. Truck has been to 2 GMC dealerships the ABS module was replaced made it approximately 2 miles and it came back on. Truck is currently waiting for another part to attempt to fix the problem. Truck has 86,000 miles on it.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11705345December 16, 2025
ENGINE
There was engine failure whereby the pushrods were ticking extremely hard. After towing the vehicle to the repair shop, it was determined that a new engine would be needed. The cost for repair was $11,500.00 dollars. The original engine has approximately 75,000 miles.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11705363December 16, 2025
ENGINE
mechanical and electrical issues with my GMC Sierra Elevation Duramax Diesel, purchased in 2021. Despite multiple dealership visits, diagnostic evaluations, repairs, and software updates, these issues persist and have significantly impacted the reliability and safety of the vehicle. In December 2025, my vehicle was taken to the dealership for diagnostics and a third software update intended to resolve recurring engine-related faults. Throughout 2025, the check engine light illuminated on approximately 30 occasions, confirmed by at-home diagnostic scans. The same diagnostic code related to the 1) SCR NOx Catalyst Efficiency Below Threshold Bank 1 Catalyst 2 P2C7A - Engine I 2) Exhaust Gas Recirculation (EGR) Cooler Efficiency Below Threshold P14D9 - Engine has appeared repeatedly since the vehicle was first purchased in 2021. Additionally, on approximately 15 occasions in 2025, the vehicle failed to start. When pressing the ignition button, the engine screeched while attempting to turn over for 20 to 45 seconds, after which the vehicle powered off entirely. After waiting approximately 10 minutes, the vehicle would then start normally. Notably, during these no-start events, no check engine light or diagnostic code appeared, and the engine light and starting failure have never occurred simultaneously. hese same concerns were explicitly explained to service technicians during the most recent recall repair in 2025. I was informed that a software update would resolve the issue. However, the problems have continued. A similar frequency of failures occurred throughout 2024. At that time, GMC advised that the issue was likely the vehicle’s battery. Acting on this recommendation, I had the battery replaced at my expense in October 2024 by the dealership. This repair did not resolve the issue. From the time of purchase in 2021 through January 2024, these same symptoms occurred approximately 10 times, demonstrating a long-standing and unresolved defect.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11705376December 16, 2025
ENGINE
My 2022 GMC Sierra Denali Limited (6.2L L87) had an engine recall performed by an authorized GMC dealer (Paul Masse Buick GMC) in November 2025. Prior to the recall service, the vehicle had no check-engine lights, no drivability issues, and no knock-related symptoms. Immediately after picking up the vehicle from the recall service, the check-engine light illuminated within seconds of leaving the dealership parking lot. I returned the vehicle immediately. The dealer diagnosed a failed knock sensor and replaced it at my expense. There were no prior warning signs or symptoms before the recall visit. General Motors declined responsibility, classifying the issue as an out-of-warranty repair and confirming only that the recall procedure was followed. GM did not evaluate whether dealer handling, component disturbance, or recall-related activity contributed to the immediate failure. I am submitting this complaint because the failure occurred directly after recall service, suggesting a possible recall-adjacent issue or unintended consequence of recall procedures, and because GM declined to investigate causation beyond procedural compliance.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11705013December 15, 2025
ENGINE, POWER TRAIN
I have 125,000 miles on my truck. I was traveling with my grandkids in the back seat. We were going through a four way stop. My truck started tapping like a lifter issue. The next thing I know is the truck engine light started flashing and car started to shake. Then, my truck lost all power and a big cloud of blue smoke came out of the tail pipe. The truck could not be driven any further. The symptoms: engine tapping, low oil, engine light flashing, shaking, lost all movement, and a cloud of smoke We had to tow my truck to the dealer and they are still accessing the issue. All symptoms are identical to the current recall of the GMC engines.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11705037December 15, 2025
ELECTRICAL SYSTEM:INSTRUMENT PANEL:SPEEDOMETER/ODOMETER
Odometer Fraud. The contact purchased a 2022 GMC Sierra 2500. It was discovered that there was a mileage discrepancy. The vehicle was a dealer sale. At the time of purchase, the vehicle mileage was 92,000, and at the time of registration, it was discovered that the mileage was 98,325. The Carfax report was not available at the time of purchase. The mileage discrepancy was later identified through the vehicle manufacturer’s Mobile App.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

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