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Help - No Speedometer Signal


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I finished up a bunch of maintenance on my '07 Cayman-S and found that I now have no speedometer reading.  Wheel bearing and shock R&R had required that I disconnect all the wheel speed sensors and the battery was also disconnected .  On start-up I knew I would see a PSM error, but it did not go away after driving a bit.  Durametric shows a P0501 error, which means no wheel speed signal.  I can clear the code but it comes right back.  Using the Durametric to view the individual wheel speeds, all 4 are at zero (when moving).  And the CAN speed signal is zero.  I checked all the sensor connectors and the connector at the ABS unit and all are good.  The PSM-related fuses are good. 

Any thoughts on how to troubleshoot this?


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1 hour ago, jons said:

For the historical record: Wheel bearing installed backwards.  It matters on 997-style bearing/carriers.


It matters on most Porsches.  This is a very common mistake as most people do not understand that the sensor shutter is internal to the bearings.  It is also possible to buy cheap bearings without the shutter wheel and get the same results.

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