GMC Sierra Complaints

15,732 consumer complaints on file.

#11711617January 17, 2026
UNKNOWN OR OTHER
Driving down the road, the radio volume will randomly rapidly increase to full volume. There is no way to turn the volume down. This is very startlingly and can lead to an accident due to the driver panicking and trying to turn off the radio or turn the volume down. It has happened approximately 5 times since I have owned the vehicle. Thie first time was when the vehicle was only a few months old. It happens so infrequently that it cannot be reproduced. It has not been confirmed nor inspected by a dealer. There is no warning as to when it might happen, nor any similar circumstances when it happens. The only solution I have found is to stop, turn off the vehicle and open the door for a minute or two, which is difficult to do in traffic.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11711411January 16, 2026
FORWARD COLLISION AVOIDANCE: ADAPTIVE CRUISE CONTROL, VEHICLE SPEED CONTROL
Cruise control activates at speeds below 2 mph which frequently happens while turning or parking. The cruise control activates by a toggle on the left spoke of the steering wheel which can be easily bumped while doing low speed maneuvers like parking. When bumping the toggle the cruise indicator shows a set speed of 15mph and the vehicle surges forward trying to attain that speed. Since this occurs while maneuvering to park, it creates a dangerous situation if anyone is nearby and you are unable to react in time. This is an ongoing problem that can be duplicated at will.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11711427January 16, 2026
ENGINE
Sudden engine issue. Knocking, power loss, brake and steering warnings. Severely damaged engine. Mechanic says 2 cylinders are irreparably damaged and entire engine must be replaced
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11711471January 16, 2026
ENGINE
my truck has not been added to the 6.2 engine recall. I have several cases of friends and acquaintances who have had multiple engine failures (including replacements)with this same engine where their trucks shut down in the middle of the highway. I’ve tried speaking with GMCs customer warranty department to get details on why my engine has not been recalled and no one including them, my selling dealer or my service dealer can explain why it has not been recalled. I do not feel safe driving this truck and I’ve come to the point where I do not feel GMC has been honest with me about this engine. I’m actively reading dozens and dozens of cases each week where some GMC trucks are on their 3 or more engine. (engines produced in 2025 and late 2024). facebook page called gm 6.2l engine and bearing failure 2019-2024 discussion group has nearly 5,000 active members on it. I’m even getting conflicting information form gmc and dealers on what oil the truck should have.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11711492January 16, 2026
UNKNOWN OR OTHER
My telematics onstar unit went bad at 37,200 miles. No onstar, no SOS, no hands free driving, etc. I paid roughly 3k for the extended subscription servies for three years. Like many others who have this problem, dealer/GM will not replace the faulty unit even though I still had time left on my on my subscription. Apparantly its a common problem.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11711558January 16, 2026
ENGINE
Driving at highway speed engine lost most power (limp mode), was able to get to an exit at low speed with flashers on but was creating a hazard on busy interstate. Dealer diagnosed truck needs new 3.0 liter duramax engine per GM TSB 25-NA-307, bad thrust bearing.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11711040January 15, 2026
POWER TRAIN
The transmission made a loud noise, resulting in a sudden decrease in speed while driving in traffic. Felt similar to being rear ended in a collision. The lights came on in my dashboard including the check engine light. Tried driving the vehicle and it would shift erraticaly rendering un-driveable. Had to be towed to my GMC dealership for service. The initial diagnosis is an issue with the "valve body". a quick search on the internet presented several other users with this issue in this model truck with this transmission. The service department also seemed to be aware of the issue. If it is so widely known, why would there not be a recall placed on these vehicles? I'm glad I had already dropped my son off at school and that I was not on a Main Street where I could safely pull over and wait for the AAA driver.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11711058January 15, 2026
POWER TRAIN, ENGINE
Vehicle passed initial inspection and had higher viscosity oil installed. After driving for the past six months I noticed a burning oil smell inside the truck. The smell gets intense at times especially during highway driving. The OW-40 viscosity oil is causing high fumes within the cockpit. Please consider checking this issue out during your added investigation into the L-87 engine failure. I shouldn't have to drive with the windows down but I do. I will have the truck inspected during my next oil change next week.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11711114January 15, 2026
POWER TRAIN
I have a 2023 GMC Sierra HD3500 6.6 Duramax. February of 2025 the valve body failed after 23,000 miles. The failure happened when the transmission had an extremely hard shift at 55 mph and then went into 5 gear limp mode. Computer through code P0700 and P0747. The P0747 is the code that tells you the valve body failed. When I took the truck to the dealer, they would not let me take the truck home because of the high risk of the transmission locking up and causing bodily injury, aka crash. Since the valve body was back ordered, I was warmed that it may be a month to get a replacement and install it. I finally got the truck back after 33 days. To add to the frustration, GM would not give me a loaner truck. They would give me a loaner SUV but that did not have what I needed out of a vehicle.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11711175January 15, 2026
ENGINE
ON THE INTERSTATE THE TRUCK SAID TO PRESS ENGINE START AND EVERYTHIG WAS DEAD, I WAS ALMOST HIT SEVERAL TIMES TRYING TO GET IT FROM THE PASSING LANE TO THE EMERGENCY LANE. I TOWED IT TO MY DEALER WHO SAID THE ENGINE SUFFERED CATASTROPHIC FAILURE DUE TO A RECALL ON THE 6.2 ENGINE. NO WARNING LAMPS OR ANY INDICATORS WERE GIVEN. ALL SERVICE RECORDS ARE IN ORDER ALONG WITH A RECALL INSPECTION RELATED TO MY ISSUE.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11711189January 15, 2026
ENGINE
Driving to the lake on the highway towing a trailer, a loud tapping noise started followed by vibration. Engine seems to have lost power during acceleration.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11711216January 15, 2026
POWER TRAIN
The contact owns a 2012 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed, the transmission unexpectedly downshifted, especially between second and third gears. The check engine warning light was intermittently illuminated. In addition, the contact stated that the engine felt as though the engine mounts were inoperable. The contact pulled over to the side of the road and turned off the vehicle. The vehicle was restarted, and the vehicle resumed normal driving. The vehicle was taken to the dealer; however, no cause for the failure was found. The vehicle was not repaired. The contact stated that the failure persisted. The manufacturer was made aware of the failure, but no assistance was offered. The failure mileage was approximately 20,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11711245January 15, 2026
POWER TRAIN
The contact owns a 2018 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed, the vehicle was shaking abnormally. No warning light was illuminated. The vehicle was taken to the dealer to be diagnosed, and it was determined that the engine needed to be replaced. The vehicle was then taken to an independent mechanic, who determined that the torque converter had failed. The torque converter was replaced, but the failure persisted. The vehicle was taken back to the independent mechanic, who replaced the torque converter a second time. The manufacturer was not made aware of the failure. The failure mileage was approximately 140,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11711286January 15, 2026
ELECTRICAL SYSTEM
Truck went in service 9/17/2025 because the wheels locked up while driving. Transmission was replaced. Picked up truck and 2 hours later the truck shut off while driving and was started back up and was limp mode. Was told wire chaffing and they taped and rerouted wires. Picked truck back up and next day it did the same thing. Took back to the dealer and they said wires again. They taped wires back up and we picked up the truck. We had it 7 days and while driving down the expressway the whole truck shut off and would not start up again. Clearly that is a safety issue. After sitting on the side of the expressway for 10 minutes it started up again and was in limp mode and taken to the dealer again. I don’t know what has been done to it yet as they are not great at communication but they have had our truck for 4 months minus the 7 days we had it before it had to go back to the dealer.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11711300January 15, 2026
POWER TRAIN
26’ GMC Sierra 1500 AT4 3.0l Duramax experiencing Harsh shifting occurring sporadically while accelerating and deceleration. More frequent and severe during quick deceleration. Severe clunking/rear wheel lock up while reversing. Very repeatable. Truck was a dealer demo and had 2400 miles on it when I bought it last week. Took it in to the dealer today and they said I need a complete new transmission.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11710835January 14, 2026
POWER TRAIN
Had a recall for the engine , went in for the pick scope test and it passed they switched the oil from 0w-20 to 0w-40 and not even 500 miles and the engine failed lucky I wasted driving it when it did
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11710862January 14, 2026
ENGINE, POWER TRAIN
With 115000 miles on it, I felt a clunk when it went in to gear. I took it to the dealer 3 times to have the mechanic drive it. He said it sounded and felt right. The the transmission blew and I had to have it replaced to the tune of 4800 dollars. 2 weeks after that the engine blew and I had to have that replaces for 17000 dollars. I really like my pickup but this seems a bit excessive. The 5.3 engine isn't good for that year
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11710896January 14, 2026
STEERING
The contact owns a 2021 GMC Sierra 1500. The contact stated that while driving 5 MPH, the vehicle lost proper steering ability, and the steering wheel became loose and spun around in a circle. The air bag message was later displayed on the instrument panel. Upon inspecting the vehicle, the contact discovered that the bolt connecting the steering shaft was missing. Due to the failure, the vehicle was towed to a dealer, where the cause of the failure was confirmed. The contact was then informed that there were no recalls or warranties on the vehicle. The manufacturer was notified several times about the failure and agreed that the part should never fail. However, the manufacturer then stated that the owner of the vehicle was responsible for the repair. The vehicle remained with the dealer unrepaired. The failure mileage was approximately 80,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11710925January 14, 2026
POWER TRAIN
Vehicle was in neutral on an alignment rack with no one in the vehicle. Vehicle was idling. Vehicle shifted into reverse on its own (no one in the vehicle) and backed off the alignment rack causing $7,000 estimated damage to the vehicle. This happened at a tire dealership (TGK, Owatonna, MN). Luckily no one got injured or killed. No inspection yet. No warning messages. This truck has had numerous "electrical glitches" previously that have had no resolution. This "glitches" have included loss of power while driving, 3 times smelling like burnt wiring upon start up, left mirror motor going bad, right mirror motor going bad.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11710942January 14, 2026
ENGINE, POWER TRAIN
I am an owner of the same year, and model GMC Sierra 1500 included in the GM Customer Satisfaction Program N212326940, which is the oil cooler line failure. However, my VIN was not included in the program despite experiencing the exact same failure the program covers. My safety and the safety of others is put at risk because the failure may cause an immediate loss of oil pressure or propulsion while driving. This is a huge safety hazard, since loss of vehicle control may occur. My vehicle has been inspected by a certified GM dealer and they confirmed the oil cooler line has failed and must be replaced. I have not experienced any warning lights, but my vehicle is leaking an excessive amount of oil. The vehicle is no longer safe to drive until repaired.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

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