Description
OEM part number A0255451332, a genuine Mercedes-Benz W220 S-Class Automatic Transmission ECU Module, removed from a written-off vehicle and confirmed in working order through testing before dispatch.
This TCU builds an adaptive shift profile over time, progressively refining gear change timing to reflect the driver’s typical patterns of acceleration and braking in the W220 S-Class. It also coordinates transmission behaviour with the car’s ESP stability programme, adjusting gear selection and torque converter engagement on low-friction surfaces to support vehicle stability and prevent loss of traction during cornering.
A defective transmission control unit in the W220 S-Class produces characteristic symptoms including harsh and lurching gear changes that are most noticeable in cold conditions, a significant delay before the automatic gearbox engages following selection of Drive or Reverse, and ultimately the transmission entering a fail-safe mode where only one or two ratios remain available for forward motion.
This is a genuine used and tested unit confirming OEM part number A0255451332. Professional installation by a qualified technician is required. Transmission TCU adaptation or a basic settings reset must be completed following installation to fully restore normal automatic gearbox operation.
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/
