2026 GMC Yukon XL problems

“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.”

“9 months into ownership, with 24,000 miles I had complete engine failure pulling into an intersection. Slamming into park while moving and shutting down. This is a known issue with the GM 6.2 liter engines but I specifically waited to order a 2026 as this was far outside the recall window GM had in place for this known issue and was led to believe the issue was fixed going forward. The car was towed to a GM dealer and sat for 39 days for a complete engine replacement. Now, a week after it has been returned it has sputtered and shut off as I am coming to a stop requiring a restart, not unlike stalling a manual transmission car. I think your agency needs to expand the investigation far further to include 2026 models. This is a 90,000 dollar brand new family hauler that I am supposed to trust my wife and kids are safe in. Now I cannot even trust it will safely take her through an intersection. Thank you for your time.”

“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 “ Issue with Engine / Transmission System Schedule service now.” This is the third time the vehicle will be at the GM dealer for diagnosis. Two times previous, dealer stated “unable to duplicate customer’s complaint.” We have owned this 2026 GMC truck for 8 months, purchased new and have nothing but issues which no GM dealer seems to be aware of nor can duplicate. This vehicle is unreliable and now has sat out of service awaiting a diagnosis for over 15 days at two different dealers. We have opened our second case with GMC Customer Care’s with zero assistance. It is the duty of a manufacturer to provide consumers with a safe and reliable vehicle. My 2026 GMC Yukon Denali is not safe and puts me and my family at risk of…”

“Computer screen is black 90% of the time. During this vehicle has no back up cameras, no control of air conditioning, no control of heat or defrost, no heated seats, no mapping system, no vehicle safety display of tire pressure, oil life, brake life, no ability to control radio. These features cannot be turned on with manual push buttons as they are controlled thru the computer screen. 2 complaints to GMC have resulted in them stating they have no fix as it is a software issue. They have refused dealer request to replace the computer. As a [XXX] with health issues, the vehicle has sat parked due to no air conditioning. With NNY winter weather approaching, vehicle is unsafe without heat or defrost. Vehicle was purchased on XXX and problem was immediate. I find it amazing that GMC has had 9 months to resolve and they do not have a single competent software engineer! GMC case #XXX issued on XXX6. Buy back denied as GMC states it does not meet NYS Lemon law because vehicle is drivable. I disagree as I feel it is unsafe. GMC case # XXX opened on XXX. On XXX I was notified by phone from GMC that Tech case was being closed as they have no way of repairing. Again,…”

“I was on the Highway and had the vehicle on cruise control, the super cruise was not available the entire trip. Suddenly a warning came on saying that supper cruise was not available please take the wheel, the truck started slowing down drastically while I’m doing 70mph which is the speed limit. I put my foot on the brake to disengage the cruise control but that did not work. I had to push the cancel button on the wheel to take it off. This has happened to me twice while on the highway.”

“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.”