Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSBMW2013128I 2D CONVERTIBLE, ENG CD N52, STANDARD TRANSREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 2055 (TRANSFER CASE - REPAIR)TRANSFER BOX27 10 730 REPLACING TRANSFER BOX CONTROL UNIT (LONGITUDINAL TORQUE MODULE) (ATC 35L)NOTES
2013 BMW 128i 2D Convertible, Eng CD N52, Standard Trans
27 10 730 Replacing transfer box control unit (longitudinal torque module) (ATC 35L): Notes
2013 BMW 128i 2D Convertible, Eng CD N52, Standard TransSECTION Notes
WARNING: This page is about a different car, the 2011 BMW 750xi, 2011 BMW 750Lxi, 2010 BMW 750xi, and 2010 BMW 750Lxi. However, it is still accessible from the selected car via links, so may be relevant.
Special tools required
IMPORTANT:
Before and after replacement, execute the "Repair" service function with the BMW diagnosis system.
READ AND COMPLY WITH NOTES ON PROTECTION AGAINST ELECTROSTATIC DISCHARGE (ESD PROTECTION).
READ AND COMPLY WITH NOTES ON PROTECTION AGAINST ELECTROSTATIC DISCHARGE (ESD PROTECTION).
Necessary preliminary tasks:
- Disconnect BATTERY NEGATIVE LEAD .
- Remove TRANSMISSION CROSS MEMBER .
Disconnect connector (1).
Release screws (3) and remove transfer box control unit (longitudinal torque module) (2).
Tightening torque 27 10 3AZ .
Installation note:
Replace O-ring.
NOTE:
Radial shaft seal of actuator shaft must be replaced as well.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.