Hey guys, not sure whats going on but after I updated hptuners with the latest download and tuned the next truck I'm getting these codes:
U0100
U0101
U0137
U0121
U0401
U0415
all to do with loosing communication with ecm/tcm/trailer brakes/abs and invalid data.
I've tuned 60+ vehicles with hptuners and never had this happen before,
any ideas why this happening?
this truck is a 2014 gmc with the 6.2 and 6pd