4wd warning lights on on 2004 Porsche Cayenne S

using diagnostic tools to diagnose, no fault code present.
vehicle can only select to low range, two option>gear reduction on or off, but cant select to ON ROAD drive. after select to ON ROAD drive, instrument cluster comes out ''4wd system fault''

Get Your Car Fixed at a RepairPal Certified Shop.
We certify shops based on expertise, quality work, and verified customer reviews
1 answer 1 comment
You will need to get the codes read out from the all wheel drive system, which your scanner may not be capable of.
i have replaced transfer case encoder motor and the range selection switch at the center console, they are working find...but the problems still exist...