What owners reported
Newest filingsFiled Sep 14, 2026MI
Engine stopped. Would not restart. I had it towed to dealership. They told me the engine is blown. There is only 7700 miles on the truck.
Filed Sep 12, 2026IN
Engine failed on this 2026 GMC Yukon Denali.. It had only 18000 miles on it, it failed in middle of hwy in Indiana. Got it towed to dealership.. they haven’t touched it since last 2 days.
Filed Sep 2, 2026TX
While traveling at highway speeds of approximately 82 mph in a 2026 GMC Yukon Denali (6.2L V8 L87 engine), the engine experienced a sudden, catastrophic internal failure and completely seized without warning. This resulted in an immediate, total loss of motive power, power steering assist, and power braking assist while surrounded by high-speed traffic. The sudden deceleration and lack of vehicle control created an extreme, life-threatening safety hazard, forcing an emergency maneuver across multiple lanes to reach the shoulder. Stranded on shoulder at night(pitch black) with lots of 18 wheelers passing.
Filed Aug 31, 2026AL
-Transmission started to slip when shifting above 2000rpms -Engine light came on and took to dealership -Error code confirmed for valve body, valve #3 failure -New valve body installed after order but also failed as I left the dealership -New valve body currently on order
Filed Aug 30, 2026TX
The engine issue was caused by a misfire in cylinder #5, which resulted in white smoke coming from the vehicle’s exhaust. While driving on the highway, the vehicle lost power and would not accelerate properly, creating a serious safety hazard due to the inability to maintain speed and safely respond to traffic conditions.
Filed Aug 30, 2026TX
The engine issue was caused by a misfire in cylinder #5, which resulted in white smoke coming from the vehicle’s exhaust. While driving on the highway, the vehicle lost power and would not accelerate properly, creating a serious safety hazard due to the inability to maintain speed and safely respond to traffic conditions.
Filed Aug 30, 2026TX
The engine issue was caused by a misfire in cylinder #5, which resulted in white smoke coming from the vehicle’s exhaust. While driving on the highway, the vehicle lost power and would not accelerate properly, creating a serious safety hazard due to the inability to maintain speed and safely respond to traffic conditions.
Filed Aug 29, 2026TN
The engine failed at 5383 miles while driving on remote highway in Nebraska.
Filed Aug 28, 2026NE
Driving down highway the engine made a squeeling noise. The engine shuttered and kept making noise then said to reduce speed. Then quit running all together.
Filed Aug 26, 20264,700 milesNE
The contact owns a 2026 GMC Yukon. The contact stated that while driving approximately 15-20 MPH and approaching a stop in Nebraska, there was an abnormal sound coming from the vehicle. The vehicle was shaking and vibrating abnormally. The contact called the local dealer, and an appointment was scheduled. The failures persisted while waiting for the appointment. While driving at an undisclosed speed, the vehicle lost motive power and stalled. The driver alerted OnStar about the failure. The vehicle failed to restart. The vehicle was towed to the local dealer, where it was diagnosed with complete engine failure. The contact was informed that the engine needed to be replaced. The vehicle was repaired; however, the contact no longer wanted the vehicle. The manufacturer was contacted and opened a case and escalated the concerns. The failure mileage was approximately 4,700.
Filed Aug 23, 2026PA
While we were visiting Canada, our GMC Yukon had fewer than 5,000 miles when its engine seized on the highway. The vehicle was taken to a GMC dealership in Canada. The dealer advised that the engine needed to be replaced, and it has now been replaced. We need to back to Canada to pick up the vehicle.
Filed Aug 22, 2026TX
While traveling on [XXX] from Houston back to San Antonio, my truck engine just blew up without any warning whatsoever. We purchased the truck with 3 miles on it, and we have only put 5,000 miles on it. New cars that cost early $100K shouldn’t be having engine failures like this. I’m lost for words now! INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
Filed Aug 21, 2026PA
My yukon denali ultimate had only 3,788 miles on it and on 7/27 while merging onto a highway my vehicle made a sound like it was trying to shift into gear but couldn't and then while I'm pressing the accelerator pedal it's slowing down. There were tractor trailer and vehicles speeding up behind me but I couldn't speed up and I was able to pull over on the shoulder luckily and I'm thankful it did not cause an accident. My yukon would not start no matter what I tried and I ended calling a tow truck and had it towed to my local GMC delearship where I was informed that the engine had seized and they would order a new replacement engine. My yukon is still sitting at the dealership waiting for the repair.
Filed Aug 10, 2026TX
GMC should be haulted from selling trucks with the 6.2L engine. My brand new 2026 GMC Yukon Denali engine imploded on the Interstate going 75mph that nearly killed my entire family. No warning, just out of no where died on the highway, with 4K miles on it. This is sadly going to get someone critically injured and when is enough going to be enough? GMC has some explaining to do, when they charge $85K-$100K for trucks that blow up as soon as you buy them.
Filed Aug 10, 2026TX
GMC should be haulted from selling trucks with the 6.2L engine. My brand new 2026 GMC Yukon Denali engine imploded on the Interstate going 75mph that nearly killed my entire family. No warning, just out of no where died on the highway, with 4K miles on it. This is sadly going to get someone critically injured and when is enough going to be enough? GMC has some explaining to do, when they charge $85K-$100K for trucks that blow up as soon as you buy them.
Filed Aug 10, 202660 milesMO
The contact owns a 2026 GMC Yukon. The contact stated that while walking alongside the rear end of the parked vehicle, the hands free function of the lift gate opened up unintentionally, no warning lights were illuminated. The contact was not injured, however expressed concern for safety as the lift gate will open without user consent while walking along the rear end of the vehicle. The local dealer was contacted however the vehicle was not diagnosed as the contact was advised that the vehicle was manufactured with the feature. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was 60.
Filed Aug 4, 20263,788 milesPA
The contact owns a 2026 GMC Yukon. The contact stated that while driving 55 MPH and depressing the accelerator pedal, the vehicle failed to respond as intended. The contact pulled over to the side of the road, turned off and restarted the vehicle; however, the failure persisted. A dealer was contacted. The vehicle was towed to the dealer to be diagnosed, and the contact was informed that the engine needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure and informed the contact that there was a wait for the replacement engine. The approximate failure mileage was 3,788.
Filed Aug 4, 2026AZ
On July 30th 2026, I was Driving on the highway at about 75 miles per hour and the engine shut down. We were fortunate that we could pull over to the side of the highway. We had the truck towed to Oxendale gmc. Today 8/4/26 I was informed that in fact the engine needs to be replace. No warnings no symptoms, the truck just shut down while driving.
Filed Jul 8, 2026UT
The vehicle was parked and turned off for approximately 45 minutes on a residential street along the curb in front of a house when the rear window suddenly shattered. I was inside a nearby house at the time. A landscaper working in the area reported hearing a single loud pop and then my vehicle’s alarm sounding. He stated he was not close to the vehicle and did not see any object strike it. When I inspected the Yukon, the entire rear window had exploded outward and inward, leaving no glass remaining in place. Glass was scattered both inside the cargo area and outside behind the vehicle. The upper liftgate section had also popped open, which is consistent with the sudden pressure release that occurs during spontaneous tempered‑glass failure. There are no impact marks, dents, or paint damage that would indicate a rock strike or external force. Given the circumstances, the debris pattern, and the absence of an impact point, this appears to be a spontaneous failure of the tempered liftgate glass, likely due to internal stress or a manufacturing defect. I am requesting that the dealership inspect the liftgate assembly, confirm the cause, and consider warranty coverage for the glass replacement and any related components.
Filed Jun 28, 2026SC
The center screen (infotainment), which shows controls for cabin climate (A/C, heat) and many more functions of the vehicle fails to turn on at random times. It is available for inspection. The external air temperature is in the upper 90s; temperature inside the car’s cabin is easily 115 or higher. This makes safe operation of the car not possible. Additionally passengers cannot occupy the vehicle safely at these extreme temperatures. The problem has been reproduced by dealers. UNKNOWN whether the components have been inspected by the manufacturer. No warning lamps or lights.
20 of 37 complaints, reproduced as filed.