Purpose
A transmission control unit or TCU is a device that controls modern electronic automatic transmissions. A TCU generally uses sensors from the vehicle as well as data provided by the engine control unit to calculate how and when to change gears in the vehicle for optimum performance.
Major Role
The typical TCU uses signals from engine sensors, automatic transmission sensors and from other electronic controllers to determine when and how to shift. More modern designs share inputs or obtain information from an input to the ECU, whereas older designs often have their own dedicated inputs.
Package Details
Module Only Modules will need to have an exact part match, please provide your exact part number Modules must be reset by a dealer before installing