Quote Originally Posted by kur4o View Post
Maybe full flash is unstable and risky via TC.
Why don`t you update it with stock os cal id with GM Oem tool first.
Then read with TC and modify. You will need a valid vin with the OS you want.
I doubt there is internal hardware changes at the PCM side.
TC works great with E38s - no issues. This is simply part of its quality assurance checks before flashing a different operating system - to prevent issues caused by incompatible calibrations. With the E38, tuning software can only write 6 out of the 8 segments. One of the non-accessible segments is the throttle controller - that is why there is a compatibility check.