Jon Schepps

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?

Jon Schepps

After a bunch of resets and driving around, all fault codes are gone, including the P0501, and the PSM error light is off. But still no speedo.
My AIM Solo unit, that gets its data from the CAN bus, also shows 0 mph when moving.
No fault codes, but no wheel speed sensor activity. ????