I have a 2006 Cayenne S. Over the last couple of months I've been getting the "Four wheel drive system faulty" message popping up randomly while driving. When I shut the car off and restart it generally goes away only to came back at a later time. The 4 wheel drive system still appears to be working fine as far as I can tell and the car drives without any issues.

I remember reading something a while back about possibly some transmission sensor going bad. Supposedly it's a quick and easy swap. Can anyone shed any light on this regarding the fix and the parts (part #s) involved? Thanks in advance.

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ignore it - I find it happens in the morning after cooler night - but only sometimes

 

I'd prefer not to ignore it but rather fix it. It never used to do it before.

 

Could be your battery getting low.

 

Yep, test the battery. I got that warning, tested the battery and under load it dropped to 6V.
New battery, no more warnings.

 

Hmmm.. I'll check it but I put in a fresh battery about a year ago. Voltmeter always shows a solid 14v

 

Transfer case motor is playing up. Quite common.

 

Not enough voltage IMO. BTDT.
There are many crappy batteries out there including Interstate sometimes that have a short life. Cayenne's have a lot of electric gadgets that consume power.
My original Verta slowly fading but I keep topping off with distilled and put it on the CTek charger every now & then.

 

When the light is OFF... shift the CS in neutral and toggle Low Range several times. It just needs to be "used" occasionally. When not used - the electrical contacts corrode slightly, which triggers the "4-wheel drive system faulty" message, whenever a voltage drop is detected.

 

+1. How old is the battery? Throw is on a charger and see if that changes anything.

 

Battery is fine, about 1 year old. Never any issues starting. Voltage is stable, never drops. I doubt it's the battery. I haven't gotten the fault message in a few months now so we'll see.

 

sounds interesting - I think I will try this.

 

Battery - when my car is cold and the battery isn't charged well (short trips with the car) it lights up when I start the car. Also it really started happening when I upgraded the nav to a double din unit. I turn off the car and start it up again and the light goes off.

 

I have same issue. I had a bad battery and replaced it but the fault came back. Usually comes 1+ hour into a hwy cruise.

 

+1 to transfer case stepper motor.

Changed mine after same messages (although I was also getting PSM fault right after it too) and no more faults.

​​​easy to change but a £300 part here in UK