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What 34 owners told NHTSA about the 2020 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 (34)Transmission & drivetrain (14)Engine (10)Brakes (3)Electrical system (2)Fuel system (2)Backup camera & sensors (1)Driver assistance (1)Electronic Stability Control (esc) (1)Engine & cooling (1)Seat belts (1)

1 of 34 complaints match · Driver assistance · clear filters

Feb 28, 2026BrakesDriver assistance

I had an incident in my 2020 GMC Yukon, where the forward collision crash alert went off and there was total loss of brakes. The brake pedal went to the floor. After the crash alert ended, the brakes returned. This happened on the highway and could have turned into a disastrous event. The dealership has been unable to diagnose or recreate this issue. They claim they did not find anything and the vehicle is safe to drive. I have turned off the collision detection system in the meantime. I feel strongly that this is a software issue that needs addressed. GM has replied that they support the dealership but if I want a second opinion I can go to another dealership for input.

NHTSA ODI 11721207

Working with the data? Download all 34 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 2020 GMC Yukon Denali Xl 1500 verdict →