Transmission Control Module on 1997 Mercedes-Benz E420

My car is staying in 1st gear. I remember my audi did the same thing and I was wondering if the TCM is the cause. Also where is the TCM located in my car

Asked by for the 1997 Mercedes-Benz E420
This type of problem will need a diagnosis to determine the fault. I wouldn't try replacing any parts until a diagnosis is performed!