Description
OEM part number 1423955, a genuine BMW Automatic Transmission ECU for the E46 3-Series, E38 7-Series, E39 5-Series and E53 X5, removed from a written-off vehicle and confirmed in working order through testing before dispatch.
This TCU delivers ZF automatic gearbox management across four BMW platforms, controlling upshift speed mapping and torque converter lockup engagement for the E46, E38, E39 and E53. It simultaneously processes multiple sensor inputs including road speed, engine load and selector position to determine the optimal moment for each ratio change, balancing fuel efficiency against driver demand across all available driving conditions.
Typical symptoms of transmission ECU failure across the E46, E38, E39 or E53 include jerky or inconsistent gear changes that occur at irregular and unpredictable intervals, the automatic gearbox becoming fixed in a single forward ratio, an EML or gearbox warning indication appearing on the instrument panel, and the transmission entering a restricted operating programme that limits the vehicle to basic forward motion until the fault is diagnosed and the module replaced.
This is a genuine used and tested unit. OEM part number is 1423955. Professional installation by a qualified technician is required. A transmission TCU adaptation or basic settings reset must be performed following installation to complete the repair across any of the four compatible BMW platforms.
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/
