2026 GMC Yukon transmission problems

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 — an unverified report by a vehicle owner.

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 — an unverified report by a vehicle owner.

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 — an unverified report by a vehicle owner.

POWER TRAIN

My engine with less than 5,000 miles died (engine was blown). While driving on highway engine died and wheels locked and almost caused a major accident. I had to get a tow and bill cost me 700.00. GMC is giving me the run around. Dealer stated that engine will need to be replaced. GMC is doing nothing to assist me, I have a car note with no truck GMC is the biggest scam.

NHTSA complaint #11740744 — an unverified report by a vehicle owner.

POWER TRAIN

vehicle lost power on highway with my sons family in the car. Vehicle was towed to dealer from which it was purchased . outcome was the motor failed and a remedy could be months out with gm only offering a 35/a day rental from enterprise which no vehicle that compares can be rented at that cost.

NHTSA complaint #11730379 — an unverified report by a vehicle owner.

POWER TRAIN

Nothing has happened yet. However, after only 308 miles… my 2026 Denali is knocking and ticking very loud. Why? How is this possible? We’ve only had it 2 weeks! I have only driven it 5-6 times in the past 14-15 days, too worried that this might happen. But I was reassured by the dealership it wouldn’t. But here I am now. I am so disappointed. Being a Disabled Vet I thought we could have something that we both liked. Now I am upset because I feel betrayed and lied to. I did a video but it’s too large to upload so I can’t get it under 10MB.

NHTSA complaint #11729324 — an unverified report by a vehicle owner.

POWER TRAIN

Motor blown up, truck shut off while driving. Loss of all power.

NHTSA complaint #11725518 — an unverified report by a vehicle owner.

POWER TRAIN

2026 Yukon Elevation with 3,957miles. I was driving down the road and pulled into the turn lane at an intersection. Vehicle cut off with the Auto Start/Stop function and would not start back up. I continued and tried to restart the vehicle but would not start; I was blocking the lane with cars continuously going around me. Vehicle stated service transmission on the display- I was unable to put it into neutral to push it out of traffic; You are only allowed to put it into neutral when crank and couldnt get the accessory mode to come on without the vehicle trying to start. I called the local police department and they sent an officer to direct traffic until a tow truck showed up. Both observed the vehicle not starting. There were no symptoms prior to the vehicle cutting off, only once auto start/stop initiated did the vehicle not restart. Vehicle will be sent back to the dealership tomorrow to resolve this issue. I have dash cam footage of the incident and photos of the display on the screen.

NHTSA complaint #11721306 — an unverified report by a vehicle owner.

POWER TRAIN

Engine failure while driving 75 miles per hour in highway in brand new Yukon Denali. 3,000 miles and got a “decreased acceleration” warning. Then couldn’t accelerate and loud knocking noise from the engine, likely a lifter issue. I will have to get a new engine according to GMC. Unbelievable. Recall was for 2021-2024, but my 2026 is havin the same issue.

NHTSA complaint #11716485 — an unverified report by a vehicle owner.

POWER TRAIN

The contact owns a 2026 GMC Yukon Denali. The contact stated that while driving approximately 55 MPH, the vehicle stalled and failed to return to normal operation. The message "Shifting to Neutral" was displayed on the instrument panel. The vehicle was towed to the dealer, where it was diagnosed, and determined that the engine needed to be replaced. The vehicle was not repaired. The contact researched and became aware of an unknown recall however, the VIN was not under recall. The manufacturer was notified of the failure and referred the contact to the NHTSA Hotline to report the failure. The failure mileage was approximately 3,303.

NHTSA complaint #11715578 — an unverified report by a vehicle owner.