Join Date: Sep 2012
Location: New Garus, Wisconsin
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Sorry that unplugging the side detection modules didn't bring things back. In doing some more research there is an HMI, human machine interface, module update that fixes a lot of issues, from blank screens to phone connectivity issues. The update is for HMI module build versions older than gmg2_14.0f105. Press power + menu + home to bring up The version number screen. The TSB is PI1375C. On code U0140 there is a tsb#PIT4730B that has you look for shorts in the high speed GM Lan circuits (2500 & 2501) witch have experienced an intermitent short to ground while going over bumps.
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Last edited by Bart77; 03-21-2018 at 01:42 PM.