My car is having the same problem again as it did last year. It shifts hard from 2 to 3rd. Last year I got a new transmission and now it's doing the same exact thing. I'm thinking that it's the TCM. So if anyone knows how can i reset the TCM? The dealership states reseting the car by taking off the positive for 20 minutes should reset everything in the car. I know the Tiburon has a learning computer that learns your driving style is there any way to reset the whole ECM?