2015 GMC Sierra Denali 3500 cargo lights blinking

[RCope]

I have a 2015 GMC Sierra Denali 3500 quad cab dually 4x4 with an Alison automatic trans. My cargo lights in the mirrors keep blinking with or without the ignition on and at random times I get several different messages on the instrument panel and all gauges stop working. Anyone have any idea what it may be. 

Edited July 6, 2024 by 99silveradoz71

[newdude]

28 minutes ago, RCope said:

I have a 2015 GMC Sierra Denali 3500 quad cab dually 4x4 with an Alison automatic trans. My cargo lights in the mirrors keep blinking with or without the ignition on and at random times I get several different messages on the instrument panel and all gauges stop working. Anyone have any idea what it may be. 

 

 

Check for loose grounds.  One know ground point that can come loose is the one under the driver's side dash speaker grille.