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We have a heavy snow here in Poland so I wanted to use reduction to get home safely.

Unfortunately a massage showed up on the screen which says that "4 wheel drive fault......"

Car is in the garage now and I cannot get it back to normal 4 wheel drive - reduction is still on. No chance to get it to second type of reduction. Massage stays on

I had 2 trials where I managed to get it back to normal 4 wheel drive as I thought that maybe snow did some damage or water etc. nothing.

I am looking at many topics here on the forum and it looks like it may be the servomotor?

The transfer case was not used very often.

Battery was changed 7 months ago.

Any ideas where to start?

No chance to connect it to durametric as I am over 100 km from Warsaw Porsche Stealership.

Need Your help Guys as I need this car to run smooth again.

Oil in the transmission was changed 3 weeks ago.

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Anything would be a guess without the codes. I would get online and order a Durametric cable and have it overnight shipped, when you mention the dealership I believe you are meaning PIWIS vs Durametric. In my case my durametric cable was a tool I ended up using nearly every month on my CTT.

This was posted quite a while ago, it worked for me:

0. Stop and start your engine (in case you got already fault message)

1. Activate off-road /Low Range mode/ driving program (use rocker switch) with gear shift lever in neutral position

2. Drive your car for a while (move forward/backward several meters)

3. Activate on-road /High Range mode/ driving program (use rocker switch) with gear shift lever in neutral position

It may "heal" your all-wheel drive system, e.g. resistor, which identifes mode in which system is and generates fault message when corroded - it happens when you do not use this feature for a long time...

Also, you mentioned the battery was replaced 3 months ago. I would also HIGHLY recommend you disconnect the battery and clean your ground connection at the battery and at the chassis.

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  • 4 weeks later...

Hi All,

Pkscheldt many thanks for Your help.

It turned out that the problem was that servomotor could not move itself fully to the low range position and that is mainly due to the lack of use of low range. Servomotor was replaced (we used one from VW Touareg) and that solved the problem

Edited by Kamil Barański
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