BMW Late Model BMWs Starter Failures

The starter on many late model BMWs incorporates a one-way clutch which allows the engine to spin faster than the starter during engagement. While this makes for smooth, quiet starting and gear engagement, it also provides opportunity for problems! It seems that many BMWs requiring a Bosch remanufactured starter SR0445X are experiencing multiple starter failures due to the starter motor remaining engaged after the engine has started and the ignition key has been released.

There's nothing wrong with the starter, it's the ignition lock cylinder assembly! The mechanical portion of the ignition switch gets hung up in the start position and doesn't return to the run position. When this happens, the one-way clutch in the starter allows the starter to continue spinning with the engine; prolonged use in this condition will overheat the starter causing permanent damage as well as draining the battery. To correct this condition, the entire lock cylinder, steering lock, and electrical switch unit must be replaced.

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