The two morning sessions were fine. First afternoon session, about the 3rd lap I see the light go on. I went back to my video and it went on in the straightway after I got a pass signal and floored it. When I pit I recall the message saying PSM Failure, Start/Stop operation deactivated (did not take a pic but someone asked me why I pitted and recorded me saying PSM failure). Restarting the car the message goes away. Second afternoon session, about an hour later, again about the 3rd lap I see the light but I don't know for sure when it started - video was tilted too much to see. It does not seem to be near the same point on the track. After pitting, the message now reads PSM loss, possibly to drive on carefully (took pic to remember) along with the Start/Stop deactivated. Again restarting the issue goes away. I took the message seriously so I drove home (150+miles) no problems, no hesitations, etc.
Searching, it seems that the conventional wisdom points to one of three things:
- brake switch, presumably used by PSM to determine when and how much I am braking
- coil problem, not sure how this is involved in PSM but I mention it because the initial warning went on when flooring the car
- ABS sensor or associated wiring, which makes sense as part of the PSM system
My car is a 2014, and the major service was done in late April 2018.
I use track pads at every event and I zip tie the pad wear sensors to the ABS wire. I never make it tight and there is no pull on the ABS wire. I've done this many times but of course I could have screwed some this time. Still I would think it would have failed from the get-go.
Hopefully the Porsche guys can pull some kind of code as the car is still under warranty. Damn shame as I missed two track days at my fav track (Thunderhill 5 mile).
Any help is appreciated. Thanks in advance.