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'14 CTTS psm failure

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Old 05-29-2018, 08:20 PM
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mikew968
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Default '14 CTTS psm failure
Am getting a repeatable PSM failure...30-40 mph on a straight road, steady but aggressive squeeze down of the throttle to FT, boost hits around .9 bar and psm failure engages and car goes into limp mode. Dealer read codes and says it is from wheel spin delta front to rear. I have 295-21's continental DWS. Service tech says too hard of a tire and not Porsche approve tire allowing too much wheel spin. Anybody else have this?


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Old 05-29-2018, 09:42 PM
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CarGuyNVA
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No, never heard of such a situation. I guess it’s possible.....but how probable?? I dunno. Do you feel/detect any wheelspin, however slight? 295/35s are pretty beefy, I can’t imagine even a CTTS powertrain breaking these loose enough from a 30-40mph roll to cause such a condition, even non NO rated tires.
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Old 05-29-2018, 11:28 PM
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garrett376
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Originally Posted by CarGuyNVA
No, never heard of such a situation. I guess it’s possible.....but how probable?? I dunno. Do you feel/detect any wheelspin, however slight? 295/35s are pretty beefy, I can’t imagine even a CTTS powertrain breaking these loose enough from a 30-40mph roll to cause such a condition, even non NO rated tires.

Right... a 5000lb vehicle breaking its tires loose on dry straight ground!? Even if that happened, PSM would just kick in to control the situation without an error. I think "wheel spin" is meant to be "rolling diameter". The incorrect rolling diameters could certain cause the PSM error. Are these tires all worn the same?
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Old 05-29-2018, 11:32 PM
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Tires are relatively new. I thought PSM kicks in and you go on your way...not causing a PSM failure mode?????
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Old 05-29-2018, 11:37 PM
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Originally Posted by mikew968
Tires are relatively new. I thought PSM kicks in and you go on your way...not causing a PSM failure mode?????
Right, it does. Anyone who does burnouts in the snow or dirt knows this. Something isn't right. Bad wheel bearing perhaps making a wheel speed sensor wobble?

You need to look into this further, like having a KNOWLEDGEABLE tech assess the reproducible error while driving by monitoring whatever PSM value causes the failure. That's a reason they make the PIWIS computers on laptops, to bring along!
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Old 05-29-2018, 11:56 PM
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Good idea...thanks!
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Old 05-29-2018, 11:57 PM
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SA says he gets 4-5 of these calls per day???????
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Old 05-30-2018, 12:26 AM
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jlusby
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Which dealership are you working with on this? If you would prefer, you can PM me instead of posting that.
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Old 05-30-2018, 12:45 AM
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stiles_s
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Have you tried to repro with stability control turned off?
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Old 05-30-2018, 09:00 AM
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s996
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I have the exact tires on my 14 cd and no errors for about 20k miles. 21 inch, air suspension.

These are great tires through last fall and mild winter this year. Rotating 5-7 k good wear. ?To hard for cayenne?

I would look look for something else causing the code.
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Old 05-30-2018, 03:04 PM
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POV is dealership

have appointment in the couple of weeks for them to re-evaluate.

it did fit today under 1/2 throttle acceleration!!!
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Old 06-17-2018, 09:18 PM
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Dealership canceled appt so need to reschedule. The problem happens with WOT or full boost.
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Old 06-18-2018, 07:20 AM
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Elberoth
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Originally Posted by mikew968
Service tech says too hard of a tire and not Porsche approve tire allowing too much wheel spin.
The stories those people make up to get rid of a customer with a problem, never stop to amaze me.

I mean - to anyone knowledgable with cars - this is a total BS.

Change the dealer or write a complain to Porsche NA.
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Old 06-18-2018, 10:21 AM
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Originally Posted by Elberoth
The stories those people make up to get rid of a customer with a problem, never stop to amaze me.

I mean - to anyone knowledgable with cars - this is a total BS.

Change the dealer or write a complain to Porsche NA.
Agree. That's absolute nonsense.
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Old 06-19-2018, 09:10 PM
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I stopped in today and had a mechanic jump into the car. Pulled onto a side road, hit the gas moderately, the engine went to limp mode and I looked at the mechanic and said was that wheel spin??? No, was his answer and the issue is a fault code for a ignition coil. Hopefully they will do all 8 of them.
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