GMC Sierra Complaints

15,732 consumer complaints on file.

#11668734June 23, 2025
ENGINE
The original engine in my 2023 GMC Sierra 1500 (6.2L L87) failed in November 2023 at only 2,872 miles. The dealership diagnosed engine knocking and discovered a damaged thrust bearing and crankshaft with metal debris throughout. The engine was replaced under warranty. In April 2025, GM issued Safety Recall N252494001 for the same engine model due to connecting rod and/or crankshaft manufacturing defects. According to GM’s bulletin, engine failure can result in sudden loss of propulsion and increase the risk of a crash. Despite already experiencing this failure and being within the affected model year and engine range, I have been told the recall remedy is not available to me because the campaign applies only to dealer inventory vehicles, and my recall status remains "Recall Incomplete: Remedy Not Yet Available." I requested a safety inspection of the replacement engine, but GM has refused, citing the incomplete status. When I escalated to GMC Customer Care, I was told they could not confirm whether my truck is safe or unsafe to drive. This is after already being stranded once with a family vehicle that cost nearly $80,000. I frequently drive with my family and feel I am being left at risk. GM appears to be prioritizing unsold vehicles while leaving current owners without support or assurance. The current engine has not yet failed, but I have no confidence it is safe, especially as it may include the same defective components described in the recall.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11668221June 20, 2025
POWER TRAIN, FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING
I am reporting a critical issue with the transmission. The transmission frequently slips, hesitates, and jerks unexpectedly during acceleration and gear shifts. On multiple occasions, the vehicle has lost power or failed to respond while entering intersections, merging onto highways, or attempting to accelerate—posing a serious safety risk. The issue often occurs without warning and has worsened over time. Additionally, there are instances of harsh downshifting, delayed engagement from park to drive, and sudden lurching forward or backward, which could easily result in a collision. Despite visits to the dealership and complaints made, the issue has not been resolved, and I’ve learned that many other owners of this same model have reported nearly identical symptoms. This appears to be a systemic problem with the transmission system. Given the safety risk, especially in traffic and at high speeds, I strongly believe this defect warrants immediate investigation and a formal recall.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11668227June 20, 2025
SERVICE BRAKES
While towing my fifth wheel trailer, the truck intermittently disconnects the trailer brakes while in motion. This results in a sudden loss of roughly 75% of my braking capability, creating an extremely dangerous situation. I have a professional driving background, which has helped me avoid an accident so far, but this issue could easily result in a collision, especially under emergency braking or downhill conditions Service Attempt: On June 17, 2025, I brought the vehicle to Madras Chevrolet in Oregon. The dealership acknowledged the issue but stated the truck is “within GM parameters,” so no repairs were made. They claimed the problem might be with the trailer, but I’ve confirmed the trailer works properly with other tow vehicles. This appears to be a systemic electrical or control issue with the truck. Safety Concern: No vehicle should be allowed to disable trailer brakes while moving. This is a clear design or control system fault. I am concerned that other GMC or GM truck owners may be at similar risk and urge the NHTSA to investigate this problem before it results in serious injury or death. PS. On social media most owners say this is happening to them
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11668047June 20, 2025
UNKNOWN OR OTHER
When I am in park my engine shuts off the light goes from green to orange which indicates it’s still on electrically. I have to turn on/off my vehicle multiple times for it to turn off fully. It’s an intermittent problem.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11668057June 20, 2025
ENGINE
The contact owns a 2020 GMC Sierra 1500. The contact stated while driving at an undisclosed speed, there was an abnormal knocking sound coming from the engine compartment before the vehicle lost motive power with the check engine warning light illuminated. The vehicle was towed to the residence. The dealer was contacted; however, the vehicle was not diagnosed or repaired. The dealer referred the contact to the manufacturer for further assistance. The manufacturer was made aware of the failure. The approximate failure mileage was 138,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11668167June 20, 2025
ENGINE AND ENGINE COOLING
The contact owns a 2024 GMC Sierra 1500. The contact stated that while attempting to start the vehicle, the engine failed to turn over. No warning lights were illuminated. The contact received notification of NHTSA Campaign Number: 25V274000 (Engine and Engine Cooling); however, the part to do the recall repair was not yet available. The local dealer was contacted, and AAA arrived, and the vehicle was jump-started. The vehicle was taken to a local dealer where the vehicle was diagnosed and determined that the engine needed to be replaced. The vehicle remained at the dealer awaiting parts. The vehicle was not repaired, and after several weeks, the contact was advised that the vehicle could no longer remain at the dealer. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was made aware of the issue. The failure mileage was approximately 19,300. VIN tool confirms parts not available.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11668179June 20, 2025
UNKNOWN OR OTHER
The tailgate automatically opens when I open the driver door. There is a recall on this for GMC Sierras, same model and year but were manufactured in Canada. This is happening to my vehicle but because it is manufactured in USA it is not part of the current recall. PLEASE recall the USA trucks too. Dangerous!
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11667918June 19, 2025
SUSPENSION
The passenger side rear wheel went into a pothole while making a right turn on a city street. This resulted in the right rear leaf spring breaking at the forward mounting point. This caused thr rear axle to swivel impacting the rear of the wheel well. The ESC malfunction indicator and impact sensor malfunction llights illuminated appropriately 2-3 miles later after I was in a highway. This is a significant safety concern as I was at an increased speed in heavy traffic by the time the lights illuminated. This not only puts the vehicle occupants at risk, this is potentially a significant risk to other motorist. There were no noticeable indications of damage besides pulling until I was at appropriately 55mph on the highway. The vehicle is currently at a dealership for repair.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11668022June 19, 2025
FUEL/PROPULSION SYSTEM
The CP4 pump failed while driving causing vehicle to stall. Upon failure, lost power to steering. Luckily we were on an access road for a rest area and not yet on the interstate. This resulted in a 14.5 thousand repair. No prior warning to pump failure. GM has recently settled a class action related to this pumps failure and has never recalled trucks with this pump to avoid failure.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11668027June 19, 2025
ENGINE
while traveling at 45 mph, vehicle starting jerking violently and lost most power. the engine began rattling very bad and extreme noises came from engine compartment.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11668036June 19, 2025
ENGINE
Lifters and rollers failed. Vehicle is at a repair facility and it has been confirmed that the rollers on the cam seized causing metal shavings to build up in the oil. No symptoms or warning lights showed up before the problem was identified.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11667595June 18, 2025
STEERING
While driving vehicle at normal speeds the steering assist goes out and becomes very hazardous to drive. It is intermittent and does not do it all the time. When connected to dealer diagnostic machine it throws several codes. I have read on several GM sites this problem is widespread and GM is actively saying they haven’t heard of this problem. When the problem occurs it is almost impossible to control the truck to get over to the side of the road.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11667721June 18, 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); however, the part to do the recall repair was not yet available. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The dealer was made aware of the issue and confirmed that parts were not yet available. The manufacturer was made aware of the issue and confirmed that parts were not yet available. The contact had not experienced a failure. VIN tool confirms parts not available.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11667767June 18, 2025
ENGINE
I heard a ticking in the engine and noticed multiple warning lights in the dashboard. I called the GMC dealer and was told the next opening was several weeks away. I was also told that it would be OK to drive the vehicle which I did (~10 miles) and parked the truck in my driveway until I could get the truck in for a diagnostic evaluation. The service department at the GMC dealer where the vehicle was purchased identified a defective camshaft/lifter as the source of the noise and lights. The service manager recommended either an engine rebuild at their shop or purchase a replacement motor from the GMC inventory network. The serial # of the old motor is: 126852545. The serial # of the new motor is: 40208378. The cost of the new motor, replacement of required fluids and parts and labor was $12,360. 100% of the repair was paid by myself. The .pdf of the service record (RO #: 9189240) exceeds the 10 MB limit and cannot be uploaded. I have a hard copy if needed. The dealership where the vehicle was purchased and serviced is: TULLEY Buick - GMC - BMW - Mazda P.O. Box T 147 Daniel Webster Highway South Nashua, New Hampshire 03060 (603) 888-0550 www.tulley.com
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11667795June 18, 2025
VISIBILITY/WIPER
The rear back glass is leaking water excessively in to the inside of the vehicle when it rains or gets washed. The vehicle is available at any time for inspection. The amount of condensation that accumulates on all the interior windows makes it impossible to see out of the vehicle. The defrost can not handle the amount of moisture build up. The Dealer knows about this condition and it has been verified by a window company. The manufacture knows and understands there is a problem and has put out a Technical Service Bulletin ( TSB 18‑NA‑383 ) for this issue but will not cover the repairs. GM knows that every single vehicle with this window designs from 2019-20121 will leak just outside the 3 year 36k mile warranty coverage. The cost of repair is approximately $2k. Dealer will not cover repair.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11667844June 18, 2025
ENGINE
To Whom It May Concern, I am submitting this report regarding repeated engine and valve lifter failures in my 2009 GMC Sierra 1500 with a 5.3L V8 engine, VIN: [XXX] . 1. Component/System Malfunctioned: Both the original engine and a replacement engine—professionally installed by a Chevrolet dealership—experienced valve lifter failure related to the Active Fuel Management (AFM) system. The most recent failure was sudden and unexpected. The engine may be available for inspection upon request. 2. Safety Risk: Engine failure puts driver and passenger safety at serious risk, particularly if the vehicle loses power unexpectedly while in motion. In both instances, the failure created unsafe driving conditions. 3. Reproduction/Confirmation: The issue was confirmed by a Chevrolet dealership during the initial engine failure and again more recently on the current engine, which is now exhibiting the same failure. 4. Inspection Status: The vehicle has been inspected by the same dealership that performed the original engine replacement. To my knowledge, it has not been inspected by GM corporate, police, or insurance representatives. 5. Warning Signs: There were no warning lamps, messages, or clear symptoms prior to the failure. The problem occurred without advance notice and did not provide an opportunity to address it before damage occurred. This is the second engine failure my truck has suffered from the same issue, even after dealership installation of a new motor. I urge the NHTSA to investigate whether this represents a broader defect in GM 5.3L AFM-equipped engines. It is unacceptable that repeated critical failures can occur in these engines with no warning and no resolution, even after following proper replacement procedures. Thank you for your attention. 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
#11667847June 18, 2025
POWER TRAIN
coolant control valve failure activating check engine light, reduced power mode and fan running continuously. Truck has been in the shop for 3 weeks already with no part available.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11667320June 17, 2025
POWER TRAIN, ELECTRICAL SYSTEM, VEHICLE SPEED CONTROL
During a turn in the parking lot my vehicle would not allow me to turn something with traction control came up on the screen. The past few days the car got stuck at 0 rpms while driving and did not feel I had adequate power and other times has stalled.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11667338June 17, 2025
ENGINE AND ENGINE COOLING
The contact owns a 2021 GMC Sierra 1500. The contact stated that while driving at various speeds, the check engine warning light illuminated, and the engine fan activated and operated at a very high velocity. Additionally, the message "Engine Power Failure" message was displayed, and the vehicle stalled. The vehicle was taken to the local dealer who diagnosed that the engine coolant control valve was faulty and needed to be replaced. The contact was informed that the parts were on backorder and no repairs were performed. The manufacturer was not yet contacted. The failure mileage was 48,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11667353June 17, 2025
ENGINE AND ENGINE COOLING
The contact owns a 2019 GMC Sierra 1500. The contact stated while driving 10 MPH, the vehicle made an abnormal ticking sound. The contact stated that the failure also occurred upon starting the vehicle. The vehicle was taken to the dealer, where the camshaft and lifters were replaced, and other unknown required repairs were performed. The vehicle was repaired. The contact related the failure to NHTSA Action Number: PE25001. The manufacturer was notified of the failure and informed the contact that the vehicle was not covered. The manufacturer referred the contact to the NHTSA Hotline for assistance. The failure mileage was approximately 52,029.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

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