"TC Off" light

[Rom]

Hi all,

 

My "TC Off" light comes on occassionally and was wondering if anyone knew why it could be happening.  I've seen posts where people say their TC and ABS lights come on, but for me it's just the TC light, and if it comes on it's always from when I start the car.  If I shut off the car, then start it again, usually it's resolved.  When it comes on this way, the TC switch doesn't make any difference (i.e. I can't turn the light off again with the TC switch - only by shutting off the car then starting it again).  Presumably while this light is on my traction control is not functioning, and I'm guessing it's because of a detected fault.

 

I'm guessing I'm going to need a PST2 or Durametric to figure this out...  but if anyone had any idea of common causes, would be great.  It doesn't happen all the time - I'd say once every 50 starts, so it's fairly rare (2% of the time).  Also, will the ECU remember the codes for the TC malfunction?  Presumable I can retrieve the code later even if the fault isn't currently manifested.

 

Thanks!

S.

 

[JFP in PA]

Hi all,

 

My "TC Off" light comes on occassionally and was wondering if anyone knew why it could be happening.  I've seen posts where people say their TC and ABS lights come on, but for me it's just the TC light, and if it comes on it's always from when I start the car.  If I shut off the car, then start it again, usually it's resolved.  When it comes on this way, the TC switch doesn't make any difference (i.e. I can't turn the light off again with the TC switch - only by shutting off the car then starting it again).  Presumably while this light is on my traction control is not functioning, and I'm guessing it's because of a detected fault.

 

I'm guessing I'm going to need a PST2 or Durametric to figure this out...  but if anyone had any idea of common causes, would be great.  It doesn't happen all the time - I'd say once every 50 starts, so it's fairly rare (2% of the time).  Also, will the ECU remember the codes for the TC malfunction?  Presumable I can retrieve the code later even if the fault isn't currently manifested.

 

Thanks!

S.

 

TC. PSM and ABS false indications are very often voltage related (weak battery, alternator, bad grounds, etc.).  Get the car scanned with a Porsche specific system, and if there are no codes active or pending, start looking at your electrical system.