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What Causes a BMW Transmission to Automatically Shift to P Gear?

1 Answers

BryceDella

07/30/25 8:16am

BMW transmission automatically shifting to P gear can be caused by the following reasons: Excessive Wear: Due to excessive wear of transmission gears, gear sleeves, or synchronizer cone disc teeth, a conical shape forms along the tooth length direction. During engagement, this creates an axial thrust. Combined with vibration and the inertial effects of speed changes during operation, it forces the engaged gears to disengage axially. Bending Deformation: Bending deformation of the shift fork, severe wear, loose fixing screws, or deformation of the shift lever can prevent gears from engaging properly. Spring Failure: Wear and looseness of the self-locking device, insufficient spring force, or broken springs result in inadequate locking force, preventing the shift fork shaft from being reliably positioned.

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