NHTSA Complaint #11687033 — 2008 BMW 550I

ENGINE issue reported to NHTSA

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Complaint Details

ODI Number	11687033
Vehicle	2008 BMW 550I
Component	ENGINE
Date of Incident	May 1, 2025
Date Filed	September 13, 2025
Mileage	N/A miles
Crash	No
Fire	No
Injuries	0
Deaths	0
Vehicle Towed	No
State	TX

Consumer Description

Vehicle abruptly shut off while reversing out of my driveway. Vehicle restarted after a long crank and appeared to enter a reduced power mode/limp mode with a transmission fault that locked the transmission in 4th gear. Reading OBD2 codes revealed a code for the crankshaft position sensor. Inspection of the 3 terminal sensor revealed 2 of the terminal contacts on the sensor to be shorted out with melted plastic on both the sensor and the wiring connector plug. Shorted wire could be a result of a leaking coolant passage at rear of engine within bellhousing where sensor is located. Coolant intrusion into sensor connector resulted in electrical short and melted connections.

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