Not too sure what went wrong, but I was tuning an '08 C6 and on the first write to the vehicle, things were playing up with traction and stability as a DTC. Deleted those files and ran the motor with no problems. 2nd write to the vehicle, I lost all communication with the VCM?

This is a first for me, I pulled out another scan tool to see if it was the HPTuners cable or any part of HPT that was the problem with no luck of connection either.

Took the battery off and reset all computers, with no start and no connection as well.

Customer told me they took it to another shop and they started it fine. Would like to know for future referance what might be the cause of this as well as knowing a fix.

Thanks,