Shae3838

Thank you for the info but I was actually talking about my situation...on a flat surface with no incline at all. It came on two different times then my engine light came on. That and all the little glitches I was experiencing were supposedly related to the brake system malfunctioning. I actually apply the break if I'm on any kind of incline. I do know that techs aren't always right, tho ?

I took mine in for service this week. They told me the parking break shouldn't be coming on by itself. Everything I reported seemed to be linked to the breaks. They read all the codes and said it was all network issues. Everything was up to date but they thought there might have been a glitch with the last update. They cleared the codes and everything seems good now.

My 20 Sierra diesel has 6k on it. First my sound went out completely. Nothing for radio or auxiliary. When I let it sit a min and started it, everything worked. Then my parking brake set itself on a flat surface. Then again on a slight incline. I thought this was weird since I just spent 5 weeks in KY ( I live in flat IL) and it never did that. The idle sounded a little off today and now my engine light is on. My diagnostic report says "an attached device may be preventing the diagnostic test from completing. Unplug any devices from the diagnostic port and try again later." I have nothing plugged in to the port and not even a phone charger plugged in to my truck.