2020 GMC Sierra Elevation Electrical Issues

[Alan Mills]

My 2020 GMC Sierra Elevation entertainment system not always works.  At first it would randomly start after turning on the truck, in minutes to hours.  Now randomly works minutes to days.  About every minute the compass will flash and then the clock turns on for 2-3 seconds.  When the entertainment center turns on, compass and clock work with no issue.  I disconnected the batter.  No improvement.  Fuse is good.  Not a loose wire as it does not start when the truck rattles and when the entertainment center does work it does not turn off unless I turn off the engine.  The battery is good.  Any suggestions?

[repairman54]

Just because the truck cranks up and runs don't assume the battery is OK at 3 yrs. Get the battery load tested. 

Every time you start the truck all the systems boot up. Any low voltage during that time before alternator comes up to speed will confuse systems and modules on their initial boot up.

Battery is very suspect especially having erratic issues.