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4 wheel drive system fault

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I used to get this fault if the car had been stood for a week or so, once the car had been used for a few miles if you switched the car off and back on again the fault disappeared.

I found as time went on it was happening more often and I decided to change the Battery, once the battery was changed I had no more issues during the warm Summer months.

Now that we are experiencing colder temperatures overnight every time I use the car I get the fault again and after a few short miles if I stop and start the car again it disappears until the next start the following day after been parked overnight.

Anybody got any experience of this themselves and if so what was the fix?

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On 11/14/2019 at 2:01 PM, acer54 said:

I'm getting the codes read tomorrow, I will report back afterwards.


Had codes read and it pointed to low voltage issues, as I said previously battery was replaced by Porsche last July.
Put the battery on charge for 3hrs, starting voltage 11.4 volts and when charge was complete it was 14.4 volts.
Started the engine and hey presto no 4 wheel drive system warning alarm which would confirm that it's voltage driven.
This only started a week ago during the cold nights, I don't use the car every day and when I do it's only for short journeys.
What's the way forward with this, should I buy a maintenance charger like a CTEK for example to use when the car is sat idle or is their another way?

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