Originally Posted by
GMPX
The trick is to always select "Replace and Reprogram", then you just supply a valid VIN for what you need and it should all happen regardless of what is currently in the ECM. Mind you, it would appear by doing this you are also bypassing some checks that TIS has in place to make sure you don't program the incorrect things in!
I don't critisise TIS too harshly, it would be a total nightmare trying to track exactly what each vehicle requires. I can certainly understand how mistakes can sometimes happen. If it wasn't there we would all be stuck!!
Cheers,
Ross