Transmission Control Module: Description

WARNING: This page is about a different car, the 2006 Dodge Sprinter. However, it is still accessible from the selected car via links, so may be relevant.

The transmission control module (TCM) receives, processes and sends various digital and analog signals related to the automatic transmission. In addition, it processes information received from other vehicle systems, such as engine torque and speed, accelerator pedal position, wheel speed, kick-down switch, traction control information, etc.

The TCM is located under the driver's seat and is connected to other control modules via a CAN bus. It controls all shift functions to achieve smooth shift comfort in all driving situations considering:

Vehicle speed.
Transmission status.
Position of selector lever.
Selected shift range.
CAN signals.
Engine Status.

Engine speed limits may be reached in all gears with full throttle or in kick-down operation. In forward driving, the shift range of the forward gears can be adjusted by the operator by tipping the selector lever to the left or right (AutoStick). However, the TCM features a downshift inhibitor to prevent the engine from overspeeding.