2026 GMC Yukon

40 complaints on file, page 1 of 2.

1. Filed Sep 30, 2026Failure Sep 28, 2026Homestead, FLEngine

   This engine failed while I was driving. You need to speed up the process and make GM know that their 6.2 engines are failing still to this day . People can get in accidents due to this happening. GM needs to be held accountable for their mistakes. I was lucky my vehicle engine failed near my home and not on the interstate. Please get to the bottom of this . There is no reason that these engines are failing in 2026.

   NHTSA complaint 11768184
2. Filed Sep 29, 2026Failure Sep 28, 2026Homestead, FLEngine

   Engine failed . Stalled in the middle of the road . Engine ran bad . Shaking knocking and trebling. No engine lights on .

   NHTSA complaint 11767887
3. Filed Sep 29, 2026Failure Jul 25, 2026Seattle, WAEngine, Power train

   On 7/25/26 (a Saturday), we started to hear a noise in my vehicle and shortly thereafter, were sent a service alert through the GMC app and the check engine light came on. We immediately parked the vehicle and took it to the dealership when they opened on 7/27/2026 (Monday). Later that day, we were informed that my Yukon Denali, with 9,226 miles on it, has metal fragments in the oil caused by some sort of failure in the bottom half of the engine and the engine needs to be replaced. The engine was replaced and I picked up my car on 8/17/2026. The check engine light came on again on 8/20/2026 and after three trips to the dealership, my catalytic converter was replaced. Since purchasing my car on December 4, 2025, I have taken it back to the dealership 5 times for non-routine services (and once for a routine oil change). Since purchasing a BRAND NEW 2026 GMC Denali (a car that cost over $100,000) less than 10 months ago, I have been without my car for 33 days for manufacturing related issues that are all under warranty. I still don't think the engine issues are fixed (or I have another bad engine). My vehicle sounds metallic at start up (different than it sounded when I purchased the vehicle and different than other 2024-2026 GMC Yukons with the same engine) and idles rougher than it used to. I am nervous driving my car on road trips now, which is one of the primary reasons we purchased the vehicle. I did my research before purchasing this vehicle and based on information from GM, was under the impression that the engine issues plaguing the 2021-2025 engines had been resolved. This issue is still a MAJOR concern and needs to be investigated and remedied before something more catastrophic happens.

   NHTSA complaint 11767753
4. Filed Sep 14, 2026Failure Sep 2, 2026Highland, MIEngine

   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.

   NHTSA complaint 11764153
5. Filed Sep 12, 2026Failure Sep 10, 2026Ingalls, INEngine

   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.

   NHTSA complaint 11763830
6. Filed Sep 2, 2026Failure Aug 31, 2026Abilene, TXEngine

   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.

   NHTSA complaint 11761517
7. Filed Aug 31, 2026Failure Aug 5, 2026Athens, ALEngine

   -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

   NHTSA complaint 11760884
8. Filed Aug 30, 2026Failure Aug 28, 2026Snyder, TXEngine

   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.

   NHTSA complaint 11760799
9. Filed Aug 30, 2026Failure Aug 28, 2026Snyder, TXEngine

   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.

   NHTSA complaint 11760798
10. Filed Aug 30, 2026Failure Aug 28, 2026Snyder, TXEngine

    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.

    NHTSA complaint 11760797
11. Filed Aug 29, 2026Failure Jul 30, 2026Spring Hill, TNEngine

    The engine failed at 5383 miles while driving on remote highway in Nebraska.

    NHTSA complaint 11760591
12. Filed Aug 28, 2026Failure Aug 17, 2026Norfolk, NEEngine

    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.

    NHTSA complaint 11760278
13. Filed Aug 26, 2026Failure Aug 19, 20264,700 milesBennington, NEEngine

    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.

    NHTSA complaint 11759661
14. Filed Aug 23, 2026Failure Aug 1, 2026Bromall, PAEngine

    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.

    NHTSA complaint 11758951
15. Filed Aug 22, 2026Failure Jul 25, 2026San Antonio, TXEngine, Power train

    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)

    NHTSA complaint 11758683
16. Filed Aug 21, 2026Failure Jul 27, 2026Maxatawny, PAEngine

    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.

    NHTSA complaint 11758609
17. Filed Aug 10, 2026Failure Aug 9, 202660 milesWebster Groves, MOElectrical system, Latches/locks/linkages

    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.

    NHTSA complaint 11755918
18. Filed Aug 10, 2026Failure Jul 25, 2026San Antonio, TXEngine, Power train

    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.

    NHTSA complaint 11755814
19. Filed Aug 10, 2026Failure Jul 25, 2026San Antonio, TXEngine, Power train

    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.

    NHTSA complaint 11755813
20. Filed Aug 4, 2026Failure Jul 30, 2026Tempe, AZEngine

    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.

    NHTSA complaint 11754757