I recently purchased a new to me 03 lb7. I've tried to put my superchips in it until I purchase more efi, but if will notmake communications with the truck dash lights do weird stuff.
I have 2 of those still they are so weird it will work on 1 truck and no be able to establish contact in another 1 not sure why.Back when we used to stack we stacked the stupid chips with the edgeSome would sell to another buddy and buy another 1 some guys switched to get them to work. Good luckPower at lighter, and unit lights up. when it goes to save the stock file it says can not establish communications it works on my buddies truck I've tried several different programmers all with same outcome.
Truck doesn't have onstar. I've pulled abs fuse radio fuse and cig lighter fuses