Cayenne S - start/stop fail, engine light on
Cayenne S - start/stop fail, engine light on
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Discussion

KABB

Original Poster:

3 posts

88 months

Tuesday 11th April 2023
quotequote all
My cayenne s (69 plate, 25,000 town running miles) has started playing up with the start/stop failing, engine light now on (not flashing!). The ACC and lane change assist also fails now and again.

This has been happening for a week and the engine fan goes crazy when I switch the car off.

Any one have this problem? Is it time for a dealer visit?

Thanks

BenjiA

313 posts

228 months

Wednesday 12th April 2023
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Might be worth getting a code reader on it (porsche specific ones availiable for just over £100 from ebay - icarsoft is the one i have) It will cost you a few quid just to get the garage to do that. Once you have the codes a quick google will give you an idea of what might be wrong.

No personal experience here, but I heard stop start can go crazy if the battery is on it's way out.

KABB

Original Poster:

3 posts

88 months

Wednesday 12th April 2023
quotequote all
Thx! I’ve looked at a scanner and have decided I’m out of my depth so have booked the car in for a diagnostic.

Here’s hoping for an easy fix. I’ll post the update here in case useful to others.

Pope

2,652 posts

265 months

Thursday 13th April 2023
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Hope you get it sorted; the network stress has backed down a bit recently so booking in should be quicker! A possible cause I have seen previously is related to your symptoms; the DME CU needs permanent comms with the fan controllers - if that link has failed the fans will run continuously to protect the drivetrain from overheat conditions; so it it may be a simple wire break rather than a component failure. The diagnosis system will have a code stored in the above case. Keep this thread updated.