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OEM part number 1423690 is a genuine used and tested automatic transmission ECU module from BMW, suitable for E46 and E39 series vehicles.
The transmission control module manages gear selection, torque converter lockup, and the adaptive shift mapping that evolves with the driver’s style over time. Sport, Economy, and Winter programmes are all managed by this unit, along with kickdown logic for maximum acceleration response and limp-home protection that engages automatically on fault detection. The TCM maintains constant dialogue with the engine ECU to ensure smooth power delivery at all times.
Signs of TCM failure include erratic or harsh gear changes, the gearbox becoming fixed in a single limp-home ratio (typically 3rd gear), slow or refused engagement of Drive or Reverse, loss of kickdown function, and fault codes appearing under the transmission control module address during diagnostic scanning.
The unit has been inspected and is in good used condition, with OEM part number 1423690 confirmed. Professional fitting is recommended, and coding or adaptation using BMW diagnostic equipment may be necessary following installation. 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/
