Yea I had a 99 grand prix that threw the tcc code so I pulled the side cover off and replaced the 3 solenoids right there and never had a problem after that. maybe still could be a problem with a solenoid. but no codes so far and tranny shifts flawless. Going to take it to the local transmission shop Monday and have them scan it. but how it came after the first oil sensor then went away for a little bit after the second oil sensor confuses me.