One problem related to warnings has been reported for the 2020 GMC Yukon. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2020 GMC Yukon based on all problems reported for the 2020 Yukon.
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.