GMC Complaints

The contact owns a 2022 GMC Sierra Denali 1500. The contact stated that while driving at 73 MPH the vehicle lost motive power. The contact was able to pull over safely. The driver was unaware of any warning lights being illuminated. The local dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was not notified. The failure mileage was unknown. The VIN was not available.

*gas tank had become partially dislodged from the undercarriage. *Entire family was in vehicle at time of incident, including three small children. The safety of an entire family along with any others that may have been on the road, if the car would have combusted due to the gas tank which had just been filled to capacity. *vehicle has been at Mark Christopher GM dealership for over one month. *dealership service dept claims someone tried to steal gas tank. *Mercury insurance company claims mechanical failure. *No warning given from vehicle. We heard a dragging noise while we were driving, pulled over as soon as possible. Upon inspection, it was observed that fuel tank had begun to leak fuel from dragging on the freeway.

Bought the acadia in june of 2021, in december of 2022 had to have the radiator replaced due to it leaking. This was found on routine maintenance and was not having any issues whatsoever. I received no alerts on my dash such as a check engine light. Fast Forward to March 2026, I received a message of "steering assist reduced. drive with care." The engine seemed like it was still running despite the car being off. This was happening intermittently and definitely not every time I drove. I made an appointment for the regular oil change and to have this message investigated. Initially they told me it was the temperature regulator, however, they put a new regulator on and tried to re-pressurize the system. The system failed to re-pressurize due to the radiator leaking AGAIN. Of course, there was a 2 year warranty on the radiator after it was replaced initially and now we are about a 1.5 years outside the warranty.

My 2023 GMC Hummer EV 3X has experienced repeated thermal-protection failures in the high-voltage battery and drive-motor cooling system, causing the vehicle to enter limp mode and drop to as low as 12 mph without warning. Stored fault codes: P0C12, P0C13, P2EE0, P2EE1 (battery and drive-unit overheating). A sudden, unannounced drop to 12 mph in a 9,000-lb EV is a serious safety hazard — on highways it creates rear-end collision risk, in intersections it leaves the vehicle stranded in traffic, and on remote roads it can strand the driver with no safe shoulder. Visit 1 (Covert Buick GMC of Bee Cave, TX): 02/09/2026–03/24/2026, 43 days out of service. Repairs: replaced both EV coolant pumps (PN 85605761), replaced Drive Motor Inverter Module 2 (PN 24059125), coolant flush, software update. RO #BUCS138101. GM TAC Case #88689105. Six days after return, on 03/30/2026, the same defect recurred with the same fault codes. Vehicle has now been back at the dealer 38+ additional days with no resolution. GM had pre-sale knowledge of this exact defect on this exact VIN. The vehicle was a GM corporate evaluation unit (factory option code OAR — EVALUATION VEHICLE) operated out of GM Tech Center in Warren, MI. GM took it out of service on 08/07/2025 at 30,169 miles. I took delivery 16 miles later at 30,185 miles. A GM Driver Inspection Form left inside the vehicle at delivery is handwritten with "Limited Speed 12 mph" — the exact limp-mode behavior. GM auctioned the vehicle through CVO Warren Distribution Center without disclosing this condition. I request ODI open a preliminary evaluation of cooling-system thermal-protection failures on 2022–2024 Hummer EV Pickups and SUVs, particularly units with prior corporate/fleet use.

Recently my vehicle was serviced under recall N252494000 at an authorized GM dealership. Following completion of the recall remedy, which included an inspection and oil change to OW-40. As a result of this recall remedy, I have experienced the following adverse effects: •Significant increase in oil change costs from approximately $80.50 to $171.21 •Noticeable decrease in fuel economy (previously 18-20 mpg, now approximately 15-16 mpg). •Ongoing concern regarding engine reliability and safety •Diminished resale value due to the known engine defect and recall history. It is my understanding that this recall addresses a known defect involving internal engine components that may lead to catastrophic engine failure and sudden loss of propulsion. I am also aware that the NHTSA has initiated further investigation into failures occurring even after the recall remedy has been performed.

On April 12, 2026, while traveling approximately 65 mph westbound on XXX in [XXX] (just east of Exit XXX), the engine in our 2022 GMC Yukon Denali failed without any prior warning. This occurred on a four-lane highway where I was in the lane furthest from the shoulder. The engine shut off, the vehicle automatically shifted into neutral, and I had to cross multiple lanes of traffic to reach the shoulder without power steering while the vehicle was rapidly decelerating. I had my [XXX] son and [XXX] dog in the vehicle at the time, which created a significant safety risk. VDOT arrived on scene within minutes but was unable to jump-start the vehicle. I contacted Southern Buick GMC Kia in Greenbrier, VA and arranged for towing through their service. The vehicle was towed to their facility the same day. On April 14, 2026, the dealership informed me that the engine had failed and contacted GMC headquarters to order a replacement engine under the vehicle’s VIN. The vehicle remains at Southern Buick GMC Kia in Greenbrier, VA, where it is available for inspection by NHTSA. Previously, a PicoScope test was performed on October 7, 2025, under warranty code XXX. At that time, the engine was determined not to be eligible for warranty replacement; the oil was changed and a new oil cap was installed. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Motor started knocking My safety and my family safety was put at risk because we were driving down the street. The car is now at Woody dealership in Naperville, IL. Being inspected as we speak. No symptoms prior to failing.

The contact owns a 2026 GMC Yukon XL. The contact stated while parked and occupied in the vehicle or driving at night he can only see out of the bottom of the windshield. a dealer was contacted. The vehicle was taken to the dealer, and they offered no assistance. The vehicle was not repaired. The manufacturer was notified of the failure, and they informed him they will call the dealer to take a look at the vehicle at night. The failure mileage was 150.

On April 1, 2026 at approximately 7pm the vehicle had a complete engine failure exiting an interstate. As I was slowing to exit the interstate the truck, without warning, lost power and locked up the rear wheels. I was able to safely exit onto the off ramp, but did partially block the off ramp for 45 minutes waiting on a tow truck. Once I came to a complete stop the dashboard began displaying numerous error codes, included "key missing, restart truck and shift to park, and start failure". The vehicle was part of the GM L87 engine recall but had previously passed the PICO test and was deemed OK to drive. I had the vehicle towed to the closest GMC dealership where it was diagnosed as an engine failure and the engine was locked up. The vehicle has been at the GMC dealership since the night of April 1, 2026 with no date given as to when it will be fixed. The vehicle had displayed no signs of any problems prior to the engine failure on April 1, 2026.

I was traveling with my family on the Ohio Turnpike. We were traveling west in our 2023 GMC Yukon Denali when we lost all propulsion and the engine seized. There was no warning lights or other symptoms prior to this incident on May 3, 2026. In fact, I had the vehicle in for the prescribed recall to test the engine for the known defect earlier in 2026. The vehicle passed that test and was given the upgraded oil change to presumably prevent the engine failure in the future. It did not work. Our safety and others on the turnpike were at risk while we were traveling at highway rates of speed with sudden loss of all propulsion. The vehicle was towed that evening to local GM dealer - Yark Chevy in [XXX] . Upon inspection on May 5, 2026, the dealership informed me the engine had seized and would be replaced by GM. They were unable to provide a timeline for this repair. I have the tow expense of $260.70 and now the uncertainty of when I might have a vehicle back. The safety of my family and all others traveling the Ohio Turnpike that date were at significant risk. The vehicle remains at Yark Chevy in Perrysburg, Ohio available for inspection upon request. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)