BMW ATC300 xDrive Transfer Case Actuator Motor

This is the servo motor that bolts to the side of the ATC300 transfer case on E90-era 3 Series and E60-era 5 Series xDrive cars. It turns the lever that clamps the transfer case clutch pack, which sets how much torque goes to the front axle. It replaces BMW 27107599693, 27107599690, 27107613152, 27107613153, 27107546671 and 27107549030.

Listed fitment: 2006 325xi and 330xi, 2007-2008 328xi and 335xi, 2009-2013 328i xDrive and 335i xDrive, 2006-2007 530xi, 2008 528xi and 535xi, and 2009-2010 528i xDrive and 535i xDrive. It only fits cars with the ATC300 case, so check the tag on your transfer case. The X3 and X5 use different cases and different motors.

A failing motor usually shows up as the 4x4, DSC and ABS warning lights together, a whine or grinding from under the center of the car in tight turns, or front drive that engages late. The motor has a plastic gear that strips inside, so the case itself is often fine.

Bench notes: unplug the 2-pin connector, remove the mounting bolts and pull the motor straight out. Check the 15-tooth drive gear on the old motor. Put the new motor in, torque the bolts evenly, and clear the fault codes. Many shops also change the transfer case fluid at the same time.