GMC Sierra Complaints

15,732 consumer complaints on file.

#11720780February 26, 2026
ELECTRICAL SYSTEM
While the 2017 GMC Sierra was warming up via remote start, I noticed a smell of smoke as I walked by the passenger side of the truck. Then I heard a loud bang as I was walking around the rear of the truck. As I entered the truck from the driver's door I saw the back window, passenger side, shattered. The vehicle was then turned off. According to our dealership the vehicle was looked at under recall N192265660 and deemed safe in May of 2020. A call was placed to GM who said the recall expired in 2022. An offer was made by for payment assistance by the GM representative but could not say how much until we pay the dealership for a diagnostic. This is a know issue by GM. The location of the shattered window is situated inches behind where my child's head would have been had she been in the vehicle.The smell of smoke is extremely concerning because where there's smoke there's fire.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11720829February 26, 2026
ENGINE
Misfiring due to DFM which is a common issue. Running a scan confirmed. I have installed a AFM/DFM disabler which seems to fix the issue.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11720355February 25, 2026
SERVICE BRAKES, HYDRAULIC
The contact owns a 2019 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed, the brake pedal was depressed, and the brakes seized. No warning lights were illuminated. The contact parked the vehicle. The contact inspected the vehicle; however, the failure reoccurred. The contact attempted to drive the vehicle several times, but the failure reoccurred. The contact stated that the failure was persistent. Due to the failures, the contact was almost in two crashes. The vehicle was towed to an independent mechanic, where it was diagnosed with a brake module reset. The independent mechanic contacted the dealer and was informed that the brake module needed to be reset. The technician from the dealer installed the software for the brake module reset, and the vehicle was repaired. The vehicle was retrieved, but the failure reoccurred a month later. The vehicle was towed to the dealer, and the contact was informed that the vehicle needed to be inspected by the engineer. The vehicle was not diagnosed or repaired. The contact was advised to continue driving the vehicle. The contact was advised to disable all the safety features. The contact stated that two major crashes were averted and refused to drive the vehicle until it was repaired. The contact stated that the failure was common with the vehicle. The manufacturer was made aware of the failure, and a case was filed. The failure mileage was approximately 68,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11720369February 25, 2026
UNKNOWN OR OTHER
coolant control valve failed, truck cannot be driven due to overheating, Dealer has said due the national backorder, it could be 2 months before they receive the replacement part. There is a significant national backorder on the engine coolant flow control valve for 2020–2025 GMC Sierra and Chevrolet Silverado trucks equipped with the 3.0L Duramax (LM2/LZ0) diesel engine. Many owners are reporting wait times of several weeks to months, with some vehicles sitting in repair shops for over 70 days.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11720375February 25, 2026
UNKNOWN OR OTHER
At approximately 29,000 miles, my 2023 GMC Sierra 1500 experienced a transmission failure. The transmission began slipping, shifting improperly, and operating unpredictably during normal driving conditions. This occurred without warning and well below the expected lifespan of a transmission, indicating a serious defect rather than normal wear or maintenance-related issues. The vehicle became unreliable and unsafe to operate, particularly during acceleration and highway driving, where delayed or improper shifting created a potential safety hazard. I relied on this vehicle for daily transportation and work, and the worsening transmission condition made continued operation unsafe and impractical. I later became aware that transmission failures are a widespread and documented issue affecting this model year GMC Sierra 1500, suggesting a possible manufacturing or design defect. Due to the severity and premature nature of this transmission failure, I was forced to return the vehicle early. General Motors is now charging me a balance of over $10,000 related to the early lease termination, which was directly caused by this defective transmission and not by customer misuse or negligence. My requested resolution is for General Motors to waive the full balance of over $10,000, as this financial obligation resulted solely from a premature transmission failure caused by a defect outside of my control.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11720376February 25, 2026
STRUCTURE:BODY
While driving on the interstate the top part of the grill flew off into following traffic.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11720377February 25, 2026
EQUIPMENT
The contact owns a 2026 GMC Sierra 1500. The contact stated that after purchasing the vehicle, there was no Owner’s Manual in the vehicle. The contact inquired about the Owner’s Manual and was informed by the dealer that an Owner’s Manual was no longer printed. The contact checked online and became aware of FMVSS 225, which was related to the Owner’s Manuals for similar vehicles. The contact researched NHTSA Campaign Number: 25V815000 (Equipment), addressing the lack of an Owner’s Manual for 2026 Chevrolet Silverado 1500, 2500, and 3500 vehicles. The manufacturer was not notified of the issue.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11720409February 25, 2026
ELECTRICAL SYSTEM
I remote started my truck, and when I got to it there was smoke and a flame coming from the rear power window. The remote start activates the rear defrosters, which started the electrical issues. I shut off the engine, and a loud pop followed, which was the shattering of the driver side rear window. The flame went out, and could have easily ignited the tarp covering the truck bed. There were no warnings on the console for the issue, and no recalls available. I have seen similar recall, but in a different state and back in 2022. This leaves me with a shattered window in the back, which is unsafe for visibility, and a bill to pay due to manufacturing errors for a feature in the truck. The rear window is all melted, and the glass is chipping away.
Crash:
No
Fire:
Yes
Injuries:
0
Deaths:
0
#11720507February 25, 2026
POWER TRAIN
While driving the vehicle I received dash warnings of temperature rise. Pulled over and saw a large coolant leak coming from right side of engine compartment. Towed to dealership. Dealership informed me that coolant hose coming from heater core was routed by the manufacturer so that it rubbed on the frame. Dealer indicated problem persists on all vehicles and no given, other than replacing the hose and not remedy the problem. New hose will be in contact with frame again, causing inevitable where and breakage. Dealer did not cover under warranty nor did they offer solution for repair other than replacing those hose.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11720526February 25, 2026
ENGINE, ELECTRICAL SYSTEM
The contact owns a 2025 GMC Sierra 1500. The contact stated that while stopped at a traffic light, the gear shifter was shifted to park(P) and the vehicle stalled. The message "START Engine" was displayed. The vehicle was restarted, and the Auto START/STOP feature was disabled by pressing the "A" inside an orange circle. The contact stated that on another occasion while reversing into the driveway, the vehicle stalled. The message "START Engine" was displayed on the screen. The dealer was contacted; however, the vehicle was not taken to the dealer or an independent mechanic. The vehicle was not repaired and the failure persisted. The manufacturer was not notified of the failure. The failure mileage was approximately 16,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11720554February 25, 2026
ENGINE
Vehicle exhibited a sudden loss of power, dash screen stated a restart of the vehicle was needed. I was able to coast into a neighborhood upon attempting to restart the vehicle nothing would happen and it would not even attempt to turn over, proceeded to contact onstar for roadside assistance, vehicle taken to nearest GMC dealership where it was determined to have engine failure and a new engine under warranty will be installed.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11720059February 24, 2026
ENGINE
Have not had my truck in over a month while it’s getting repaired had engine failure sure to faulty hydraulic lifters and camshaft failure due to the Dynamic fuel management system purchased warranty for my vehicle but this needs to be looked into it is unfair as a consumer that they are not doing anything about 2020 models and earlier they are just focusing on 2021 and up. They almost had me crash my truck due to power loss
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11720207February 24, 2026
POWER TRAIN
August of 2025 [XXX] purchased a certified GMC Sierra 3500. The truck had been traded in May and sat in their service department waiting on a valve body. At this point, we knew this. [XXX] had done research on it, and felt confident in being told the valve body was completely replaced and now working…. Worst mistake we’ve made in a long time. It was not replaced, that was only the beginning of the lies. [XXX] then drove the truck across the country for work, not knowing how much of a hazzard it was. Shortly after arriving there he quickly realized the truck was still having transmission problems. We brushed it off, these things happen. Fast forward when he came home in September/October he took the truck to the Rice Buick GMC service department. Where he was supposed to “wait” on his appointment. Only to call me hours later, they clearly weren’t going to be done that day. We left not knowing that it would be nearly a month until we could drive the truck again. In the midst of that they never offered any help, a rental or anything. When I asked, they offered a tiny small car next door at enterprise. I clearly did not agree, we just spent a lot of money on a heavy duty truck for a reason. It took multiple phone calls to multiple supervisors for them to agree to let him rent a truck. Because you know they might have to spend an extra penny or something (que the eye roll). In that month of having the truck the communication was little to non existent. They never answered the phone, called back, heck most of the time the text messages weren’t even replied to. It once again took me getting a little bit ridiculous for an answer - the truck was “fixed”. When I picked up the truck I spoke to the the service manager, and he of course tried to play me like I was some dumb women who had no idea what I was talking about. He dismissed all of my concerns, acted like having a truck for a month was normal. (More attached in photos) 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
#11719889February 23, 2026
ENGINE
2025 GMC Sierra 6.2 L V8 engine failed by locking up or seizing. Heard pinging / knocking sounds while driving 3 miles from my home to the dealer. Engine shut off without warning, vehicle shifted to Neutral. Coasted to a stop, attempted to restart the engine, would only crank. Dealer diagnosis is that the engine will need to be replaced. Sounds just like the 2021 - 2024 GM recall for this same engine. Vehicle has 11,670 miles on it. Safety risk: Loss of ALL power while driving. No Warning lamps or messages prior to engine failure.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11719894February 23, 2026
ENGINE
While driving my 2019 GMC Sierra with approximately 119,000 miles the engine suddenly made a loud bang, started shaking violently, backfiring, and missing out. Took it to dealer. They diagnosed the problem as a rod failure with camshaft damage. Quoted repair cost $12,000. After repair, they were doing a 25 mile test drive before returning the truck to me. After only 20 miles, the engine completely failed. Now it needs an entire new engine. I am waiting for them to reply what the cost is. The truck was maintained exactly as required in the owners manual at General Motors dealers
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11719926February 23, 2026
ENGINE
The contact owns a 2014 GMC Sierra 1500. The contact stated that while at a stop sign, the vehicle stalled. No warning lights were illuminated. The vehicle was towed back to the residence. A dealer was contacted; however, the vehicle was not diagnosed or repaired. The contact researched and became aware of an undisclosed recall; however, the VIN was not under recall. The manufacturer was not notified of the failure. The failure mileage was approximately 81,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11719958February 23, 2026
ENGINE
L87 Catastrophic Engine Failure on second engine after 6300 miles. This is the second issue with the 6.2L engine in my Sierra 1500. The first engine passed the L87 Engine Loss of Propulsion field action and then suffered Catastrophic Engine Failure a month later. The replacement engine procedure took over 3 weeks to perform and no rental or loaner vehicle was provided by GM or the servicing dealership. The vehicle is currently in the service department at another dealership awaiting the 2nd engine replacement, but it has been over 2 weeks since the engine failure. This servicing dealer has provided a vehicle to use. This has been a very frustrating ordeal and I feel that resell and value of this vehicle has been compromised and GM has done nothing to offset this with me.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11719983February 23, 2026
ELECTRICAL SYSTEM:HORN
The contact owns a 2016 GMC Sierra 2500. The contact stated that the horn was inoperable. The contact became aware of the failure when the horn failed to sound while locking the vehicle with the key fob. Upon investigation, the contact discovered that there were no recalls on the VIN related to the failure. Neither the dealer nor the manufacturer was notified of the failure. The vehicle was not repaired. The failure mileage was approximately 150,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11719989February 23, 2026
ENGINE
After 5000 miles between oil changes, the engine had burned enough oil to have no oil in the dipstick. This equals at least 3 quarts oil if a 7 quart capacity. The dealership states this truck burns a quart to quart and a half every 2000 miles. This seems like an excess amount of oil consumption.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11719999February 23, 2026
ENGINE AND ENGINE COOLING, FUEL SYSTEM, GASOLINE
The contact owns a 2022 GMC Sierra 1500. The contact received notification of NHTSA Campaign Number: 25V274000 (ENGINE AND ENGINE COOLING). The contact had parked the vehicle in a parking space when the engine seized. No warning lights illuminated. The vehicle failed to restart and was towed to the dealer, where it was diagnosed and determined that the fuel system control module had failed. The contact was informed that the part to do the recall repair was not yet available. The vehicle remained at the dealer unrepaired. 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 failure mileage was approximately 90,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

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