Multiple Warnings when in park and pressing the brake

[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!

Edited September 26, 2020 by Cameron Andrews

[George100]

The first step is to take a deep dive into the codes, as these are ABS and Brake lights, you need to scan for the ABS system, usually there is really only one code and that code affects everything else. It is not unusual for the Cruise Control not to work if these systems are causing trouble as they are all integrated. Look for the lowest number code and work from there. 

[Nancy Fox]

Check your ground wires. If damaged, they can play havock with your systems and make many codes display.

[Barry Grimmett]

i have the exact same problem. did you ever find a fix?

 

[davester]

...5 year old thread, and the o.p. hasn't returned to the site since signing up and making that one post.  you aren't going to get a response from that user.