Description
The Transmission Control Unit (TCU) acts as the central processor for all automatic gearbox functions in the W203 C-Class. Drawing data from vehicle speed sensors, the throttle pedal position, engine management, and the gear selector, it determines and executes smooth, accurate gear changes adapted to driving conditions. ¶ Functions covered by this TCU include gear selection logic, torque converter lock-up engagement, adaptive shift mapping that tailors shift points to driver habits over time, kickdown response, economy and sport programme management, shift shock reduction through solenoid modulation, and traction control coordination to prevent wheelspin during hard acceleration from low speed. ¶ TCU failure in the W203 typically manifests as harsh or jerky shifts that worsen progressively, the gearbox locking into one gear in emergency mode, no response to kickdown regardless of throttle position, a transmission warning lamp, noticeable delay or clunk when selecting drive or reverse, and missed upshifts during steady-speed motorway driving. ¶ This is a genuine used OEM unit with reference A0325454332, removed from a written-off vehicle and fully tested before dispatch. Professional installation is required, and a TCU adaptation or reset procedure must be carried out after fitting using Mercedes-Benz diagnostic software.
Returns accepted only for genuine faults — faulty on arrival, not as described, or wrong part supplied — requested within 14 days, with all 3 anti-tamper stickers intact. No returns for change of mind, incorrect installation, coding/programming, or buyer compatibility errors; checking compatibility (OEM number, firmware, vehicle) is the buyer’s responsibility. Full policy: https://giantparts.eu/refund-and-returns/
