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What 977 owners told NHTSA about the 2015 GMC Yukon Denali Xl 1500

These are the actual owner complaints behind this car’s reliability verdict, filed with the federal government, unedited. They’re unverified reports, not confirmed defects: read them as leads for your pre-purchase inspection, not a diagnosis.

All (977)Crash / fire / injury (24)Lights (489)Electrical system (168)Brakes (158)Transmission & drivetrain (102)Engine (63)Steering (51)Body & structure (28)Suspension (27)Fuel system (23)Visibility & wipers (11)

1 of 977 complaints match · Fuel system · crash/fire/injury only · clear filters

Sep 6, 2019Speed controlFuel systemFire

WHEN THE GAS PEDAL IS DEPRESSED FULLY, THE GAS PEDAL STICKS THE CAR CONTINUES ACCELERATING. THE PROBLEM BEGAN WITH INITIAL COMPLETE DEPRESSION OF GAS PEDAL TO CAUSE SOME ACCELERATION AND DEPRESSING BRAKE ALLOWED VEHICLE TO RETURN TO NORMAL DRIVING. THE PROBLEM HAS WORSENED OVER TIME TO THE POINT WHERE BOTH FEET DEPRESSING ON THE BRAKE PEDAL DID NOT AFFECT ACCELERATION AND CAUSED SMOKE TO EMIT FROM BOTH FRONT BRAKE PADS, AND THE PASSENGER FRONT BRAKE PAD FLAMED UP FROM THE HEAT. THE CAR WAS DRIVEN INTO A PARKING LOT WITH THE BRAKE DEPRESSED THE ENTIRE TIME, AND TURNED OFF. SO FAR, THIS HAS ONLY HAPPENED WHEN THE GAS PEDAL IS FULLY DEPRESSED. THE DEALER TOLD ME THE MAT CAUSED THIS EVEN THOUGH THE MAT IS CUT AROUND THE GAS PEDAL WITH PLENTY OF ROOM TO NOT OBSTRUCT PEDAL. THE MAT ALSO DOES NOT SLIDE OR MOVE ABOUT THE AREA. THE GMC DEALER TOLD ME THEY TOOK THE MAT OUT AND DID NOT NOTICE ANY AUTO ACCELERATION, AND THEY TOLD ME THEY WERE UNABLE TO DEPRESS THE GAS PEDAL FULL TO ATTEMPT TO RECREATE THE PROBLEM, TO NOT COMPROMISE THE SAFETY OF THE OTHER CARS NEARBY.

NHTSA ODI 11253584

Working with the data? Download all 977 complaints as CSV · fetched from NHTSA July 25, 2026

How to use these: a complaint is one owner’s report, filed voluntarily and published unverified. Patterns matter more than any single story. If several owners describe the same failure at similar mileage, put that system at the top of your pre-purchase inspection list. Back to the full 2015 GMC Yukon Denali Xl 1500 verdict →