Got the car back from the shop same day with the transmission connector replaced (thanks for the correct assessment). On the way home (about 30 mins) check engine came on. The shop said they checked the transmission fluid levels. I don't have a tool to read the codes. Do you think this was a coincidence and a new problem or could something the shop did have caused it? It was not on when I left the shop and only came on after we stopped to eat somewhere and came on after we left the restaurant. Car is running fine.