Description
OEM part number 1423886 is a genuine used and tested automatic transmission ECU module from BMW, designed for E39 series vehicles.
This TCM oversees gear selection, torque converter lockup, and adaptive shift mapping that continuously refines itself to the driver’s habits. It coordinates Sport, Economy, and Winter driving programmes, handles kickdown logic for full-throttle performance, and triggers limp-home protection when a fault is detected. Close communication with the engine ECU ensures seamless power delivery under all conditions.
A failing TCM typically presents as harsh or unpredictable gear shifts, the gearbox defaulting to a single limp-home ratio (generally 3rd gear), delayed or denied engagement of Drive or Reverse, loss of kickdown response, and fault codes stored in the transmission control module diagnostic address.
This part is in good used condition with OEM part number 1423886 confirmed. Professional installation is strongly advised, and adaptation or coding with BMW-compatible diagnostic tools may be required after fitting. A 14-day return period applies.
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/
