Getriebesteuergerät
A Getriebesteuergerät, often abbreviated as TCU (Transmission Control Unit) or GWS in German, is a sophisticated electronic control unit responsible for managing the operation of an automatic transmission in a vehicle. It acts as the brain of the transmission, receiving input signals from various sensors and controlling the transmission's hydraulic or electronic actuators to ensure smooth and efficient gear changes.
The TCU monitors critical parameters such as engine speed, vehicle speed, throttle position, brake pedal status,
Modern TCUs are highly integrated and often communicate with other vehicle control units, such as the engine
The TCU also plays a vital role in diagnosing transmission faults. It stores diagnostic trouble codes (DTCs)