Cameron Andrews

I have a 2016 GMC Yukon Denali and I am having a really strange issue. I would appreciate any help you can give. Thanks! Whenever it is in park and I press the brake, I get the following warnings. -Service: Suspension System -Sevice: Trailer Brake System -Action Required: Steering Assist is Reduced Drive with Care -Indicator Light for ABS, BRAKE and Traction Control When I RELEASE the brake All warnings and problem indicator lights disappear and I get a "Service Traction Control" warning for a second and then that clears as well. As long as I am in gear I do not get any error indications even when the brake is pressed. The cruise control doesn't work, but I believe that is the control switch assembly and a separate issue, but I wanted to mention it just in case there could be a correlation. In the case of the cruise, it is always "On" (white cruise indicator on the panel) but it will not allow me to "set". Thank you in advance for your help!