TC defaults to on when the car is started for safety reasons. When wheel slip is detected boost is released, timing is pulled, and fuel cut to reduce engine power. I don't know the algorithm as to what is first, the aggressiveness, etc. I would think if the ECM is commanding the boost control solenoid to open to actuate the valve and it doesn't see a reduction in boost, it would think the bcs is malfunctioning and set a code. That is only my guess. I am still N/A till I do my top swap when it gets warmer. You can program the ECM to default to TC off so you don't have to push the button each time. If I had the time and software I would reverse engineer the TC and make it more performance based and less nanny.
