Genuine OEM Volkswagen Control Unit For 4-Speed Automatic Gearbox, part number 001927731P. This electronic control unit is responsible for managing the shifting operations of the automatic transmission, ensuring smooth and efficient gear changes. It receives input from various sensors and controls hydraulic pressure to actuate the gearbox. This unit weighs 0.382 kg and has dimensions of 0.175m x 0.165m x 0.042m. Genuine OEM control units are programmed with the correct firmware and calibration for reliable transmission operation.