*Median odometer reading when the problem happened, where owners gave one. One complaint can name several problem areas.
Engine
We own 2026 GMC Yukon XL Denali with 6.2L V8 engine with just under 4600 miles. On Monday October 19, 2026 while driving the engine seized up. It is at dealer and the are replacing the engine, radiator and about 65 other parts under hood. We do have a very short phone video of the noise it made right as it seized up!! We heard about investigation ongoing and wanted to help.
Oct 19, 2026Exterior lighting
The driver side head light developed a stress fracture on the first cold day we had in Long Island. It has been looked at by the dealer SuN gmc who are denying responsibility and claiming it was damaged by a rock. There is no visible damage to the outside of the light.
Oct 18, 2026Power train
Truck has shuttered, rough idle since May 2026 after purchased new March 2026. We have been to two different GMC dealers who cannot duplicate the problem. Last week the truck started to shutter regularly after highway travel. When coming to a stop in traffic, the truck shutters to kill, loses power, RPMs drop below 500 and then recovers to a rough idle. Last evening Oct 20,2026 while driving the engine light came on, vehicle computer stated â Issue with Engine / Transmission System Schedule service now.â This is the third time the vehicle will be at the GM dealer for diagnosis. Two times previous, dealer stated âunable to duplicate customerâs complaint.â We have owned this 2026…
Oct 19, 2026Engine
While driving there was a noise that started in the engine area. The vehicle was going 55-60 mph at the time it started. It became more and more frequent. The check engine light came on just before the engine completely seized up and lost all power. Dealership is saying there is definitely internal engine noise and engine failure.
Oct 11, 2026Unknown or other
Iâm of average stature at 5â 9â and when seated in the driverâs seat of my 2026 GMC Yukon Denali XL my left eyeball cannot see the switch to activate the four way hazard flashers because the steering wheel blocks the view of the switch. (See Attached) Iâve had the vehicle for just over two months and I found it difficult to find the hazard switch since day one. It was even more challenging tonight coming home. I was northbound on IH35E just south of IH20 in heavy traffic and the traffic rapidly came to a stop due to a crash. It took an extra level of attention to find the hazard switch at night in heavy traffic. After I cleared the accident I started to close one eye and then the…
Oct 4, 2026Engine
Total Engine failure. This is the second time. The vehicle had under 2000 miles when the first engine failure happened and left us sitting on the Turnpike. Very unsafe!! We were assured we received a new "upgraded" engine only to find out GM decided to roll the dice with our lives and the lives of our family (grandchildren) and put another bad engine in our vehicle. I will never feel safe with this vehicle or that they are putting in "new" parts.
Sep 27, 2026Engine
What component or system failed or malfunctioned, and is it available for inspection upon request? ""6.2L Engine Failed with 4,785 miles"" How was your safety or the safety of others put at risk? ""Engine Failed in active highway jug handle and required police assistance and vehicle needed to be towed to the dealer."" Has the problem been reproduced or confirmed by a dealer or independent service center? ""The dealer has confirmed that the engine failed and needs to be replaced."" Has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others? ""At this point only the dealer."" Were there any warning lamps, messages or other symptoms of the…
Sep 24, 2026Engine
The contact owns a 2026 GMC Yukon XL Denali. The contact stated that while driving 65 MPH, the engine seized. There was an abnormal burning odor inside the vehicle. The contact stated that the failure had occurred while driving on a busy highway in the middle lane. The local Police arrived and assisted with directing traffic. The vehicle was towed to the dealer, where it 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 failure was a known failure with the vehicle. The manufacturer was contacted by email and made aware of the failure. The failure mileage was approximately 5,000.
Jun 5, 2026 · 5,000 miles
Owner complaints are submitted to NHTSA by the public and are not verified. Shown as filed (NHTSA removes personal details); long reports are shortened.