The electronic transmision control module, usually called the TCM, is a key part in many cars. It help manage how the car's transmision operate. The transmision is what let the car move smooth when you push the gas. The TCM do this by send signals to the transmision on when to change gears. This make the car run better, save on gas, and cut down wear on the engine. Know how the TCM work can help you maintain your vehicle. If your car have trouble shifting, it could be the TCM. Thats when Supplyplcs can assist to get the right parts for fixing your car.