Hello guys and gals. I have a 2006 GMC C5500 with the LBZ motor. i am currently running a GDP tune through EFI live for my vehicle. I recently started throwing a code that reads U0100 which is an ECM communication issue. i have successfully returned the stock tune to the truck as a first step towards troubleshooting this issue. what i would like to know, is.... is there a way to use the parameters within efi live to locate where the communication issue is coming from? I am currently throwing 4 glow plug codes as well, which have been ongoing for several months.

i am very new to the internal workings of EFI live and would love to learn. any help?

1 stranded vagabond