I have a 09' G8 GT and last week I installed a 2800 stall Vigilante Converter. After the install i took the car out for a drive and shortly into the drive I got a P0741 code for the TCC. I cleared the code and it came back after about 5 miles. I borrowed a Tech 2 from a dealership riend of mine and we went for a drive and watched the TCC it would send the siginal to activate the TCC but the transmission was showing between 300-500 of slip. The computer will only allow up to 125 rpm of slip before setting the code.

Has anyone had this issue before? Is there a way to tune for it?


Thanks