GMC Sierra Complaints

15,732 consumer complaints on file.

#11756953August 14, 2026
POWER TRAIN
The contact owns a 2022 GMC Sierra 3500. The contact stated that while driving 65 MPH and depressing the accelerator pedal, the vehicle hesitated before going into LIMP Mode. A dealer was contacted. No warning light was illuminated. The vehicle was towed to a dealer where it was diagnosed with transmission control valve failure. The vehicle was not repaired. The contact associated the failure with 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 approximate failure mileage was 71,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11757030August 14, 2026
ENGINE
The contact owns a 2026 GMC Sierra 1500. The contact stated that while driving 70 MPH and depressing the accelerator pedal, the vehicle started decelerating unintendedly. The message “Engine Power Reduced” was displayed. A dealer was contacted. The vehicle was taken to a dealer where it was diagnosed and determined that the engine needed to be replaced. The vehicle was repaired. The manufacturer was notified of the failure and opened a case. The approximate failure mileage was 6,028.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11756888August 14, 2026
FUEL/PROPULSION SYSTEM
The fuel pump control module went bad and the vehicle shut off while driving. The vehicle is only 3 years old. Everyone I know with a GM truck or SUV has had the same issue and the dealer service writer even told me they get at least 6 vehicles with the same issue per week. There is already a recall for GM SUV's for 2021-22 model years but not for anything else even though many other vehicles have the same issue. They replaced the module under warranty but it is all but guaranteed to just keep happening.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11756641August 13, 2026
STRUCTURE:BODY
Whilst driving down the highway at 65 mph the plastic front grill deflector broke off and slammed into my windshield and the vehicle behind me. Luckily the vehicle behind me sustained no damage other than how frightened she and her children were. This is a known issue and was subject to a recall for the 2022 GMC Sierra Denali's. Nothing has changed between the 2 models as far as I can tell and it's the exact same grill deflector. When I informed the dealership of this they told me it would be a $950 repair out of pocket. First of all, it is unacceptable for a $75,000 vehicle to have a plastic component that can just break off and become an immediate and unavoidable hazard on the highways. The recall MUST be extended to these vehicles. I have reached out to GM and they confirmed it would be an out of pocket expense, but I am escalating the situation. Thank you!
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11756673August 13, 2026
POWER TRAIN
Truck vibrates at speeds from 25-45 mph while maintaining speed
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11756772August 13, 2026
STRUCTURE:BODY
rear sliding window has plastic body seam that is broken allowing water to leak into the truck and cause mold and rust
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11756858August 13, 2026
AIR BAGS, SEAT BELTS, WHEELS
I was in a rollover accident on June 26th 2025 in my boyfriends 2007 GMC Sierra 1500 where we flipped 5 and a half times. The wheel separated from the rim. I will upload photos since I am unsure how to explain how the wheel damage is. During the crash the drivers air bags deployed but the passengers did not. When we finally landed we ended up on the roof. My boyfriend tried to unbuckle my seatbelt but it would not release. He ended up cutting my seatbelt and then at that time (approx 3 min after we landed) the passenger airbag deployed striking my boyfriend in the back, neck and head. Which knocked him out for approx 1 hour. My boyfriend had several open lacerations to his back, neck, head and his arms and metal pieces were imbedded in his skin. He also suffered other injuries like a fractured back, and several other medical problems.I got a severe concussion in which it has caused me severe headaches, memory problems and cognitive issues. Both of us have reduced quality of life.
Crash:
Yes
Fire:
No
Injuries:
2
Deaths:
0
#11756392August 12, 2026
ENGINE
2021 6.2L GMC Sierra Denali. Has the L87 engine that is recalled but yet my truck doesn’t fall under the recall although the recall is for 2021-2024 engines. Everything that the engine recall states is the issue with my truck, I have service report from dealership stating that there is wear/breakage of cam shaft/crank shaft amongst other things including cylinder 3 and 5 misfiring , bearings broken , filings in the oil , banging in the engine and safety lights on. My local GMC dealership recommended that the only acceptable action was to replace the engine at my cost of course. This is unacceptable of a supposed reputable large corporation not caring about the “little guy”. The truck only has 136000 kms on it and I was only going 60 km/hr when this happened. Please help as I feel GM knows this engine is faulty but somehow has managed to escape a recall on my vin number
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11756397August 12, 2026
VEHICLE SPEED CONTROL
Push on accelerator truck barely would go, shifted hard, codes check engine lights flashing, engine sounded bad
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11756447August 12, 2026
POWER TRAIN
Transmission Valve Body failure. - Caused wheels to lockup momentarily and killed the engine with sudden loss of propulsion. Link to video of incident: [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
#11756457August 12, 2026
ENGINE
The contact owns a 2026 GMC Sierra 1500. The contact stated that while driving 45 MPH and depressing the accelerator pedal, the vehicle slowed down unexpectedly. The vehicle then lost power while stopped at a traffic light. No warning light was illuminated. The vehicle was turned off and restarted, and the vehicle operated as intended. The vehicle was taken to the dealer, where it was diagnosed and determined that there were metal shavings inside the oil pan and the engine needed to be replaced. The engine was replaced twice. The manufacturer was not notified of the failure. The approximate failure mileage was 3,202.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11756538August 12, 2026
STRUCTURE:BODY
Paint is failing and delaminating from both rear doors around windows and also the truck bed.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11756555August 12, 2026
SERVICE BRAKES, HYDRAULIC
The contact owns a 2023 GMC Sierra 1500. The contact stated that while driving at an undisclosed speed, the brake pedal was depressed; however, the brakes failed to respond as needed. The vehicle was towed to the dealer to be diagnosed. The vehicle was diagnosed with an inoperable battery, which caused the brake module to fail, preventing the brakes from operating as intended. The vehicle was repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 29,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11756621August 12, 2026
ENGINE, POWER TRAIN
At approximately 85,000 miles, the engine in my 2019 GMC Sierra 1500 seized. The vehicle was parked when it occurred. This created a safety risk because an engine seizure can cause sudden loss of propulsion in traffic. Before the failure, I didn't notice anything that would raise any alarms. The problem was inspected and confirmed by a GMC dealer, which diagnosed the condition as an engine seizure. The failed engine is not available for inspection. I am not aware of the precise internal cause beyond the dealer’s diagnosis.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11756622August 12, 2026
ENGINE, POWER TRAIN
At approximately 85,000 miles, the engine in my 2019 GMC Sierra 1500 seized. The vehicle was parked when it occurred. Inability to start. This created a safety risk because an engine seizure can cause sudden loss of propulsion in traffic. Before the failure, I did not notice any red flags. The problem was inspected and confirmed by a GMC dealer, which diagnosed the condition as an engine seizure. The failed engine is not available for inspection. I am not aware of the precise internal cause beyond the dealer’s diagnosis.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11756121August 11, 2026
STEERING, ENGINE
Head gasket failure and overheating. After fixed, power steering has just failed during driving. Will have to have it towed to shop
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11756150August 11, 2026
POWER TRAIN
transmission shift hard and slipping. When step on gas to go faster transmission shifts really hard like going drop on ground. Sometimes wont shift at all only goes up to 69 till left off gas and then transmission will shift. Start happening with about 10000 miles on truck and GMC said this is normal. Now need a torque converter and shift module in it.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11756191August 11, 2026
FUEL/PROPULSION SYSTEM, ENGINE
The vehicle stopped dead in traffic and would not restart. No warning lights. This is a huge safety hazard. Had to be towed to a dealership. The dealership and other diesel shops said the issue is a known catastrophic CP4 fuel pump failure. The fuel pump shreds and metal shavings are found throughout the fuel system. Requires a full fuel system replacement...quotes have been obtained from GM dealership and local diesel mechanics, ranged from $15,000-$17,000. There is a known fix and could have been solved by replacing the fuel pump with an alternative one, without putting us in a dangerous situation. There is also a settled class action lawsuit directly associated to this fuel pump and issue, however the vehicle was purchased in GA and therefore not included. Based on the VIN the truck would be included if sold within a qualifying state. GM corporate and dealers know about this problem and the safety risk, but are not even suggesting the fuel pump conversation as a repair. They are putting customers in dangerous situations and leaving them with high bills.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11756219August 11, 2026
POWER TRAIN
The contact owns a 2019 GMC Sierra 1500. The contact stated that while at a red traffic light, the vehicle accelerated unintendedly, and the vehicle shuddered with an abnormal dinging sound coming from the vehicle. The message "Transmission Hot - Idle Engine" was displayed on the instrument panel. The vehicle was taken to a dealer where it was diagnosed and determined that the transmission was slipping, overheating, and that the transmission needed to be replaced. The contact researched and became aware of a recall; however, the VIN was not under recall. The vehicle was not repaired. The manufacturer was notified of the failure and referred the contact to the NHTSA Hotline to report the failure. The failure mileage was approximately 126,098.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11756237August 11, 2026
VISIBILITY/WIPER
A small drip started approximately 18 months ago from top middle of left side window in rear slider. It was first mistaken as blow by from car wash. Leaking slowly progressed to dripping down middle of both side windows in rear sliders. Leaking progressed to drops coming from under headliner then dropping on side portions of rear slider. It then would drip onto seat or behind seats. Leakage was consistent with TSB 18-NA-383 as well as 20-NA-142 and 24-NA-103. In discussing with dealership, they recommended likely microfractures and sealant process called for in bulletins would likely resolve matter. As due diligence, spoke with independent glass shop to confirm. Glass shop indicated would not know until physically checked cracks/source of leak and looked for damage but based upon photos it appeared to be several frame fractures consistent with bulletins. I arranged rear slider replacement through independent shop. Upon pulling OEM slider, numerous stress cracks and fractures were noted. These included stain marks from water intrusion. Photos included showing original leaking as well as sample of cracks in original OEM plastic frame portion.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

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