Drivetrain - Oil Leak From Transfer Case

SI B27 01 12
Intermediate and Special Transmission

April 2012
Technical Service

SUBJECT
Oil Leak from Transfer Case

MODEL
E70 (X5)
E71 (X6)
F25 (X3)

SITUATION
Oil is leaking from the transmission area, or oil seepage is noticed from the transmission/transfer case area during a service.

CAUSE
The leak can be misdiagnosed as a transmission fluid leak from either the mechatronics sleeve or transmission oil pan. The leak is actually coming from the transfer case (input or output shaft seal).

PROCEDURE
Before attempting to perform any repairs, check the fluid level in both the transmission and transfer case.

If the level is low in the transfer case, repair as necessary.

For transfer case repairs, only use the defect codes related to VTG (Construction Group 27) when submitting claims for eligible and covered repairs.