Eli H

I had a similar issue with my 2015 Sierra Denali.... the gauges were going up and down , gas, oil, battery and everything on the cluster was going crazy. It would say “ service airbag” park assist off and it would also say my parking break was in and beep for a while. My AC would not work, it wouldn’t even light up. So the dealer wanted to charge me $890 to diagnose the issue so I obviously walked out and went to a mechanic that changed the AC module for $200 and solved all the issues for now. Hope this helps.