i'm trying to tune a 03 duramax
and i cannot license the ecm/tcm because the tcm has an invalid vin/os pair
i know the fix for this is to reflash the tcm w/ a tech 2 to the lastest file
the ecm has a valid vin/os pair
if i disconnect the tcm and reread the ecm (so i have an ecm only file)
and license that file make my changes and flash it back in (with tcm disconnected) can i then later (after customer has the tcm reflashed)
do a reread and still have access
i have read that hpt doesn't license to the tcm but i want to make sure before i have to shell out 2x credits when he wants the trans done
thanks