2026 GMC YUKON Complaints

The shark fin antenna has a plastic cover that is only held on by 4 plastic clips. Hi winds or car wash can compromise the cover by breaking at least two of the plastic clips allowing air to get underneath the cover and then the cover falls off. I consider this a safety issue due to the fact that if your on a highway and it comes off it can crash thru another vehicle’s windshield causing a collision with other vehicles or cause serious injury to the occupants of the vehicle it strikes. I looked online and it seems to be happening to numerous GM vehicles with it falling off.

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.

-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

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.

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.

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.

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.

Filing as a proactive data point for the ongoing NHTSA Office of Defects Investigation Engineering Analysis (EA26005) regarding GM 6.2L L87 engine failures. Vehicle is a 2026 GMC Yukon XL AT4 equipped with the 6.2L V8 and 10-speed transmission. The vehicle currently has approximately 2,800 miles and operates perfectly with no mechanical symptoms, ticking, or loss of propulsion. As an active preventive measure against internal component contamination, early engine oil changes were performed at 700 miles and 1,700 miles by a certified franchise dealer (Alpine Buick GMC). The engine continues to use the factory-specified 0W-20 oil viscosity. A magnetic oil drain plug has been installed to monitor for premature ferrous bearing and crankshaft debris at future service intervals. This report is submitted to ensure 2026 model year data running 0W-20 oil is officially documented within the federal investigation scope.

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.

Engine blew at 8,762 miles in the middle of the night with 3 small kids in the car. Currently 41 days waiting for a new engine. We were driving and it started making a clapping sound like something was caught underneath. We had to drive a could miles to find a safe place to pull over. If we increased speed, the clapping increased and it slowed when we slowed. Hauled it to the local dealership and they said it was the engine. The dealership it was purchased at says the same thing. There was no warning. After a couple of miles of the clicking/clamping sound, the car started to shake and then died. There were no warnings or light on the dash of any signs of distress until it died. It was a couple of miles before we even had a safe place to pull over on the side of the highway. Going 70mph on a highway that is posted to be 70mph with 3 kids in the car, in the middle of the night, put my family’s life in danger along with other cars behind us. Clearly safety and quality isn’t GM’s top priority. This is our 5th Yukon. Our 13th General Motors vehicle. To say we are disappointed is an understatement when we have been devoted to GM for over a decade.