GMC Sierra Complaints

15,732 consumer complaints on file.

#11684267September 1, 2025
SERVICE BRAKES, POWER TRAIN
Problem #1: Trailer brakes failed while pulling 40' fifth wheel trailer. Was driving at about 50MPH on a 55MPH road and was approaching a stop light. I went to apply my truck and trailer brakes simultaneously and quickly found out I had "lost" my trailer brake. This happened another two times within the next 10 mile trip to my house. I immediately disconnected my trailer and took my truck to the shop. The GMC Dealer fixed this issue, however, it is both scary and extremely dangerous to the public when something like this happens on a brand new truck. Problem #2: Right around 30,000 miles I was driving (unloaded) down the road at about 35MPH when I felt a hard clunk in the transmission followed by grinding noises - immediately a notice flashed on the dash stating the truck went into reduced acceleration and the check engine light came on. I brought my truck to a local GMC Dealer to be serviced on June 19th and they advised me it was the Allison transmission valve body. The part has been on back-order and my truck is still at the dealership sitting in the back lot with at least 4 other 2024 HD models. I called GM twice to inquire about Safety Recall N242454440 (covering 2020-2022 GM Vehicles) and recommend that it get extended beyond 2022 since the problem with the transmission valve body has not been resolved yet. I have not heard anything back from them since that call back in June.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11684278September 1, 2025
ENGINE
Complete engine failure on July 17, 2025, related to current recall for defective engine parts on 6.2L V8 L87 engine. Towed to dealer same day. Dealer continues to report no ETA available on replacement engine. Dealer has had possession of my unrepaired truck for 46 days now and counting.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11684291September 1, 2025
ELECTRICAL SYSTEM
The cameras will work after the vehicle sits for awhile like after it cools down. But once driving or letting the vehicle run awhile the cameras shut down. I think the Video Processor Module gets hot and shuts down. General Motors is looking into this issue
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11684221August 31, 2025
POWER TRAIN
Transmission fail to shift. Have to stop, restart truck to get it to shift causing safety issue. Warning lighted eventually came on.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11684049August 30, 2025
STEERING
While towing a less than 2000 lb trailer I had total loss of power steering when speeds dropped below about 5 mph. I got off interstate and was turning right at the end of exit ramp and I could barely turn the vehicle. At the next stop sign it did the same thing. I stopped turned off the vehicle and restarted it and it continued this for the next few miles. Then just as suddenly as it started it stopped doing this and worked fine the rest of my trip.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11684063August 30, 2025
ENGINE, FUEL/PROPULSION SYSTEM, POWER TRAIN
My truck is under the national recall from GMC for the 6.2L engine problems. I even received the recall notice from GMC stating this. This truck has been in and out of the shop for engine problems things I took delivery of it in 2022. The latest was in April of 2025 and while it was in the repair service at the dealership, the national recall came out. During that time the dealership tried to tell me the problem was with my exhaust system so I was not covered under the recall. I knew they were not being truthful so I refused to take possession of the truck as I new it had all the symptoms that GMC was describing in my recall notice. My truck sat at the dealership for almost 5 months and last week they force me to take possession of my truck my taking back my "loaner vehicle". They stated "my truck passed the required inspection", which I knew they were being dishonest, but was forced to take the truck back anyway. Three days after taking possession I was on the interstate doing 60 mph and the engine totally seized up and almost caused an accident from the vehicles behind me running into me because of the sudden decrease in speed. I was able to safely pull over and had to get towed back to the dealership. This incident is beyond just a engine recall now because they new my truck was not safe to drive and forced me to take back my truck. Im just thankful I was driving and not my wife, or having my two grandchildren in the truck with me. To make mtters worse in this scenerio, this truck is actually my replacement truck because my 2021 truck had to be taken back per the Lemon Law in 2022, so this will now be truck #2 being Lemon Law and my original truck loan isnt even paid off. I have all of the various engine repair paperwork on this truck dating back to 2022.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11684126August 30, 2025
STRUCTURE:BODY
Part of the grille of my 2023 GMC sierra AT4X flew off driving 75 miles per hour on the highway, i believe it has to do with the fasteners of the upper grille bezel.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11684139August 30, 2025
POWER TRAIN
10 speed transmission isn't shifting right in the lower gears has a wining noise
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11683980August 29, 2025
POWER TRAIN
Transmission shutters when going over 50mph
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11684012August 29, 2025
TIRES, TIRES:TREAD/BELT
I purchased a set of Firestone Destination A/T2 tires from Firestone in Southaven, MS. I had the tires for less than 16 months. I took the tires in for inspection & was told the treat belts had separated from the tires. The tires are a hazard. the tires are 275/55R20. Driving on the interstate, I had to pull over as it felt as though the truck would overturn/rollover. They must be recalled. I contacted Firestone, they were of little to no assistance. Unable to obtain a refund or credit. I googled info on firestone tires & a plethora of information exhibited the same thing, problems with tread separation.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11684017August 29, 2025
ENGINE, UNKNOWN OR OTHER
Coolant control valve failure. Instantly reduces power on truck. National back order on parts. No remedy.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11683636August 28, 2025
TIRES:TREAD/BELT
LT295/60 R20. The tread on the tire separated and a 1"x2" chunk of it fell off in the middle of the tread. Other smaller pieces of tread also fell off. Both front tires have subsequently been replaced. Smaller chunks are now missing from rear tires.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11683641August 28, 2025
ELECTRICAL SYSTEM
The contact owns a 2024 GMC Sierra 2500. The contact stated that the vehicle had failed to start on several occasions. The vehicle was taken to the dealer, where it was diagnosed with low voltage and electrical failures. The dealer replaced the two batteries; however, the failure recurred. The dealer then replaced one of the batteries; however, the failure persisted. The vehicle was towed to the dealer. The vehicle was not repaired. The manufacturer was notified of the failure, and the contact requested buyback assistance, but no assistance was provided. A case was filed. The failure mileage was approximately 22,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11683690August 28, 2025
ENGINE, POWER TRAIN
Have owned my 2021 GMC Sierra 1500 with the 3.0 Duramax for a year and the check engine light has come on multiple times for a "Coolant Control Valve" issue. The truck runs the fans at 100% and puts the truck into reduced power at least once a day. I have read that GM sometimes will not cover this repair under powertrain warranty even though it's an engine problem. Please fix this issue! To answer the previous questions, the coolant control valve is malfunctioning, and the truck is currently at the dealer being inspected. Yes the dealer has said this issue is common on these trucks (confirmed by National GMC in American Fork, Utah). Yes the check engine light has appeared multiple times. These issues started appearing in June 2025
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11683380August 27, 2025
EXTERIOR LIGHTING
The contact owns a 2014 GMC Sierra 1500. The contact stated that the headlights were dim, reducing the contact's ability to see the roadway while driving. The dealer was notified of the failure and provided an estimate for the headlights' replacement. Additionally, the contact stated that the vehicle was experiencing excessive oil consumption, and there was smoke coming out of the exhaust pipes intermittently. The vehicle was not diagnosed or repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 370,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11683399August 27, 2025
SERVICE BRAKES, HYDRAULIC
The contact owns a 2022 GMC Sierra 3500. The contact stated that while driving at 30 MPH, the message “Trailer Brake Disconnected" was displayed on the instrument panel. The contact was hauling a 5th-wheel trailer during the failure. The contact pulled over to the side of the road, turned off the vehicle, and waited for several minutes before restarting the vehicle. 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. Most recently, while driving 55 MPH, the message "Trailer Brake Disconnected" was displayed. The contact pulled over to the side of the road, turned off the vehicle, and waited before restarting the vehicle and continuing driving. The contact stated that before the most recent failure, the vehicle was taken to the dealer and the trailer plug was replaced. The vehicle was not diagnosed or repaired after the most recent failure. Upon further investigation, the contact related the failure to NHTSA Campaign Number: 21V758000 (SERVICE BRAKES, HYDRAULIC); however, the VIN was not included. The manufacturer was notified of the failure, but no assistance was offered. The failure mileage was approximately 30,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11683447August 27, 2025
AIR BAGS
The contact owns a 2015 GMC Sierra 3500. The contact stated that after parking in the driveway and turning off the vehicle, approximately 30 minutes later, the rear passenger’s side roof rail air bag erroneously deployed. The cause of the failure was not yet determined. The manufacturer and local dealer were notified of the failure. The vehicle was not yet repaired. The contact was informed that the VIN was included in the NHTSA Campaign Number: 21V504000 (AIR BAGS). The contact stated that the vehicle had experienced the failure listed in the recall. The failure mileage was 155,000. The VIN was not available.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11683496August 27, 2025
ENGINE AND ENGINE COOLING
The contact owns a 2024 GMC Sierra 1500. The contact received notification of NHTSA Campaign Number: 25V274000 (Engine and Engine cooling). The vehicle was scheduled for the recall repair; however, the contact was informed that the recall repair could not be completed. The contact was informed that the computer system was not reading the machine. In addition, the contact stated that the appointment was rescheduled by the dealer twice. The manufacturer was made aware of the failure but provided no assistance. The vehicle had not experienced a failure.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11683498August 27, 2025
AIR BAGS
The contact owns a 2008 GMC Sierra 1500. The contact received notification of NHTSA Campaign Number: 21V050000 (Air Bags); however, the part to do the recall repair was not yet available. The local dealer was contacted. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was not made aware of the issue. The contact had not experienced a failure.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11683541August 27, 2025
SERVICE BRAKES, STEERING
Hose from power steering pump came off causing truck to loose power steering and brakes. Fortunately we had just exited the interstate and were in a parking lot when this occurred. Truck was towed 90 miles to dealer who confirmed that hose was incorrectly installed by factory
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

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