GMC Complaints

I am reporting two separate stall/loss of propulsion events on my 2022 GMC Sierra 1500 Denali Limited (VIN: [XXX] ), which is subject to NHTSA Recall #25V274000 and GM Special Coverage XXX (L87 Engine Loss of Propulsion). INCIDENT 1 — April 16, 2026: While decelerating off a highway exit ramp, the vehicle stalled without warning. The dashboard prompted me to shift to neutral and restart. I performed a rolling restart successfully and continued driving. This stall occurred while decelerating on a highway exit ramp with vehicles traveling at highway speeds behind me. The sudden and unexpected loss of propulsion created a significant rear-end collision risk. INCIDENT 2 — April 17, 2026 (next day): While traveling at approximately 40 MPH and climbing a hill under load, the vehicle stalled a second time. The dashboard again prompted a neutral restart. This time the vehicle would not restart. All I heard was a single click from the starter, followed by a complete dash reboot. The vehicle lost all power repeatedly upon restart attempts. I was stranded on a narrow, high-speed rural road in Standish, Maine during rush hour, with vehicles passing at speed. I was in serious danger. The vehicle was towed to Weirs GMC in Arundel, Maine (the selling dealer), where it currently remains for diagnosis under RO# XXX. Both stall concerns are documented as Warranty Pay. Additional concern: Since the day after purchase (March 28, 2026), I have noticed a pronounced cold-start tick originating from the bottom end of the engine, confirmed by an independent mechanic as coming from inside the engine. This vehicle passed a Recall #25V274000 inspection on December 28, 2025 at 98,233 miles. The tick and stall events began after that inspection. I am requesting this be formally documented as a safety complaint tied to Recall #25V274000 and Special Coverage XXX. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

I bought this car and the mileage said 120K, but the title says when it was tagged 157K. the car has been tampered with and the some of the lights for the car on the dash are missing, such as the check engine light. Also, it misses so bad that it will die at times

Good afternoon, I am submitting this complaint to report a serious and potentially life-threatening safety issue involving my 2022 GMC Yukon Denali. While traveling northbound on State Road 417 (toll road) in Florida, approaching Exit 45, I was driving approximately 75 mph when, without any warning, the vehicle suddenly shifted itself into neutral. A message immediately appeared on the dashboard instructing me to press the start button, and the vehicle rapidly lost power and began to decelerate in the middle lane of a high-speed highway. This sudden loss of power created an extremely dangerous situation that could have easily resulted in a major collision. Vehicles behind me were traveling at highway speeds, and I had no ability to safely maintain speed or predict the failure. The lack of warning makes this issue especially concerning, as there was no opportunity to take preventive action. After the incident, I contacted OnStar for assistance. The vehicle was towed to Carl Black GMC, where the service advisor confirmed that the engine requires a full replacement. A complete engine failure occurring suddenly at highway speeds, without warning, is not just a mechanical issue—it is a critical safety hazard. This type of failure puts not only the driver but also passengers and surrounding motorists at serious risk of injury or death. It is deeply concerning that a vehicle of this age and caliber would experience such a catastrophic failure. Issues like this must be addressed immediately, as they have the potential to cause severe accidents if they continue to occur without warning. I strongly urge that this matter be investigated thoroughly and that appropriate action be taken to ensure that other drivers are not placed in similar dangerous situations. I was fortunate that my children were not in the vehicle at the time of this incident. The outcome could have been far worse. Please let me know if additional information is required.

ENGINE BREAKDOWN 1.5TURBO IN 11/28/25 WITH 16820 MILES ON IT. IT IS NOT AVAILABLE I HEARD A BANG AND SMOKE OUT OF BACK LOST POWER WHILE DRIVING ON THE HIGH WAY DAMAGE WAS CONFIRMED BUY A DEALER GOODWIN CHEVROLET IN BRUNSWICK ME YES BUY GM DEALER. NO THERE WERE NO WARNING LAMPS OR OTHER SYMPTOMS BEFORE FAILURE. CAR WAS CHECK ON 3/30/2023 AT 10383 MILES FOR SHAKING AND LOSING POWER.CAR DID COME OUT IT TOOK IT TO LEE GM DEALER IN AUBURN ME COULD NOT DUPLICATE PROBLEM.

Coolant control valve failing. Warranty not covering this part. Seems to be a manufactured issue. Happening on a lot of 2021 GMNC Sierras with the 3.0l Duramax.

The contact owns a 2021 GMC Yukon. The contact stated that while driving at an undisclosed speed, the vehicle shuddered. The message to restart the vehicle was displayed. The contact stated that the vehicle shut off unexpectedly. Additionally, the check engine warning light was illuminated the day before the failure. The contact stated that while attempting to start the vehicle, the failure reoccurred. The vehicle was taken to Auto Zone and diagnosed with a fuel pump control module failure. The contact was made aware of an undisclosed recall. The contact was referred to the dealer for assistance. The vehicle was not repaired. The vehicle was later towed to the dealer, where it was diagnosed with a failed fuel pump control module. The contact was informed that the fuel pump control module needed to be replaced. The vehicle was not repaired. The contact referenced an unknown recall with a similar failure; however, the VIN was not associated with a recall. The manufacturer was made aware of the failure but provided no assistance. The contact was advised to contact the NHTSA Hotline to report the failure. The failure mileage was approximately 200,000.

Active Fuel Management Miss firing Idle rough Shaking Loss of power #7 cylinder loss of all compression Bad fuel mileage Skipping

I bought a brand-new GMC 1500 6.2L AT4 back in 2025. Never have an engine recall. At 39K miles, lost power, and ended up replacing the camshaft and lifters. 2K miles later went back to the dealer for engine replacement.

Brakes failed to engage. Many lights lit up on dashboard and warning not to exceed 35 mph. It was determined this was due to a faulty brake system control module.

The contact owns a 2019 GMC Acadia. The contact stated that upon parking and attempting to turn off the vehicle, the message "Shift to Park" was displayed. The contact restarted the vehicle and was able to successfully park and turn off the vehicle after several attempts. Additionally, while driving at various speeds, the vehicle intermittently failed to shift as intended. Additionally, the A/C system was inoperable while driving. The check engine warning light was illuminated. The vehicle was taken to the dealer, where it was determined that the cooler and thermostat needed to be replaced. The parts were replaced; however, the vehicle was not serviced for the transmission failures. The contact stated that the vehicle was difficult to start, and the doors failed to close intermittently. The vehicle was taken to the dealer, where the battery was replaced. The contact stated that the transmission failure persisted, and there was an abnormal odor coming from underneath the hood. The vehicle was not repaired. The manufacturer was notified of the failure, and a case was filed. The contact was referred to the NHTSA Hotline to report the failure. The failure mileage was unknown.