2023 GMC YUKON Complaints

On July 14, 2026, I experienced a serious fuel system failure with my 2023 GMC Denali. That morning, I filled the vehicle with a little over 20 gallons of fuel at a gas station approximately two miles from my home. Later in the day, I made a short trip to my neighborhood swimming pool, roughly 1.5 miles round trip, with no unusual noises or warnings from the vehicle. Approximately two hours after returning home, I entered the vehicle to run an errand. When I shifted into reverse and began backing out of my carport, I immediately heard a scraping noise on the concrete. I stopped the vehicle and inspected underneath. At that point, I discovered that the entire fuel tank had fallen out of the vehicle and was resting on the ground. I contacted roadside assistance, and the vehicle was towed to the dealership. The dealership informed me that the fuel tank support straps were missing, which allowed the tank to detach and fall. I personally searched along all the routes I had driven earlier that day and did not locate any straps or debris. The tank itself showed no impact damage, suggesting it dropped cleanly rather than being torn loose by road contact. Although the vehicle is relatively new, my bumper to bumper warranty expired in September 2025, and I was charged for the repair. I have included photos taken before and during the tow, as well as the dealership’s invoice. I am extremely concerned about the safety implications of this failure. If the tank had fallen while I was driving at interstate speeds (approximately 70 mph), it could have caused a catastrophic fire hazard, loss of vehicle control, or danger to other motorists. I do not know how long the vehicle had been operating without fuel tank straps, nor why there were no warnings or indications of a structural issue. I also question why the dealership did not treat this as a manufacturing or assembly defect, given that fuel tank straps should not detach under normal use. ...RAN OUT OF CHARACTERS...

The car just died while going 55mph on the highway. Complete shutdown but luckily both the steering and brakes worked. After stopping it wouldn’t start again. I had my three children in the car aged [XXX], [XXX], and [XXX]. It was a horrific experience. GMC did some repairs to the engine that took over two months and then the car had a few more warnings pop up just a few weeks later. GMC now says there is a misfiring in one of the positions. I’m terrified of driving this car with my children as I don’t know when it will shut off again and how bad it will be! INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

2023 Yukon with 6.2; was "tested" at a local dealership in November 2025. Engine passed. Was given oil change with new oil/oil cap. In June of 2026, engine seized despite passing test in November & running the new oil since then.

On a long trip the fuel tank straps and bolts holding the gas tank failed causing the fuel tank to fall and be dragged causing massive fuel spill. The problem has been confirmed by the dealer. The part was not inspected by police. However, we did get pictures of the tank at the scene. No warning lanmps or sfty signals were

My 2023 GMC Yukon has had a strong mildew/musty odor coming from the HVAC system since the vehicle was new. The odor is most noticeable every time the vehicle is started after it has been sitting for several hours or overnight. After the system runs for a short time, the odor dissipates. This concern has been reported to my GMC dealer on multiple occasions. Previous repair attempts have not permanently corrected the problem, and the odor continues to worsen. The smell is now strong enough that it is embarrassing to have passengers in the vehicle. I have followed the recommended preventive measures, including replacing the cabin air filter, turning the A/C compressor off several minutes before shutting the vehicle off, and attempting to clean the HVAC system with commercially available products. None of these measures have resolved the issue. Based on discussions with other GMC Yukon owners, this appears to be a common and recurring problem affecting numerous vehicles of similar model years. Many owners report the same symptoms and repeated unsuccessful repair attempts. This suggests the issue may be related to the design or operation of the HVAC system, particularly moisture remaining on the evaporator core, rather than normal maintenance. I am requesting that GMC investigate this recurring defect and provide a permanent repair rather than temporary odor treatments. Owners should not have to repeatedly clean or service the HVAC system to address a condition that has existed since the vehicle was new.

The engine tries to die when in park. While stopped at a red light, it died and stated conditions not met to shift. Had to hit park button then restart it. This has happened 4 times. With & without auto start feature on

The contact owns a 2023 GMC Yukon. The contact stated that while driving at an undisclosed speed, the engine seized. No warning lights were illuminated. The vehicle was towed to the dealer and was diagnosed with engine failure. The contact was informed that the engine needed to be replaced. The vehicle was repaired. The contact was informed that the repair was covered under an unknown recall repair. The vehicle was released back to the owner; however, the failure reoccurred. The contact stated that the vehicle was idling roughly and jerking abnormally. In addition, the contact stated that the drive to the residence was not a smooth drive. The vehicle was taken back to the dealer, where a technician performed a ride-along. The contact stated that the engine seized three times during the ride along. The contact was informed that the engine needed to be replaced a second time. The contact stated that when the vehicle was released, the rear bumper was damaged. Additionally, while attempting to start the vehicle, the Forward Collision Avoidance warning light was illuminated. The vehicle remained with the dealer. The manufacturer was made aware of the failure, and a case was filed. The failure mileage was approximately 44,000.

am filing a formal complaint regarding my 2023 GMC Yukon Denali, which experienced a catastrophic engine failure while I was driving on the highway with my family. The sudden failure created a dangerous situation, placing both my family and me at significant risk. As a result of the breakdown, I was forced to pay $260 out of pocket to have the vehicle towed to the dealership. After inspecting the vehicle, the dealership advised me that the engine requires complete replacement. There was no indication that the engine was going to go. Thankfully there was a shoulder on the highway and we were able to pull over. This could have caused an accident could've been fatal.

While driving about 70 mph in the express lanes, the vehicle suddenly lost power and drifted like it went into neutral. There were no warning symbols. The vehicle could not restart even while coasting. After stopping, it locked itself in park and would not shift out of park. My family and I were trapped on the express lanes for over an hour in a dangerous location. The vehicle stayed stuck in park even on the tow truck. The dealer confirmed metal in the oil filter, a blown main fuse, and knocking when starting. The recall inspection and remedy were already done, but the failure still happened. The vehicle is undriveable and the required recall repair cannot be completed because the replacement engine is on backorder with no ETA.

On June 25, 2026 my 2023 GMC Yukon Denali with 53,456 miles was brought to an authorized GMC dealership after displaying a Service 4WD warning light and exhibiting a groaning noise when shifting into Drive and Reverse. The vehicle was diagnosed with the following brake system fault codes: P25A2, C0511, C0517, C1595 and C1596. These codes indicate brake control module failure and wheel speed sensor faults which are safety critical components. The dealership confirmed these findings but stated the repairs are not covered under the GMC powertrain warranty. Given that these are safety critical brake system failures on a nearly new vehicle with only 53,456 miles, we contacted GMC Customer Care on July 1, 2026 to request coverage under goodwill warranty as we believe these failures constitute a manufacturing defect. A case was opened however after 7 days no case advisor has been assigned and no decision has been made despite two promised timelines not being met. The brake system failures on a nearly new vehicle represent a serious safety concern as these systems directly affect the vehicle's ability to stop safely. The vehicle has been at the dealership since June 25, 2026 and remains unrepaired.