Hi, I am getting the following code on my minivan Plymouth Grand Vogager 98. P1768. I know this is related to the tcm but what do I need to do to repair the car. The car has problems some times when is suithching from about 45 t0 50 miles. I hear a noice under the left side of the car like a clunk noice then the car esitates for a second or 2. Does this means my transmition is going bad or just the transmition control module need replace. where is the TCM located? Thank you for your help.