Porsche Cayenne 05
 

Hi ! I have Porsche Cayenne 05 I'm having a problem, PSM, PHC and Four Wheel Drive System Failure every 15-20 minutes while driving. When engine is off, message disappears and comes again when I start driving again. Battery changed. Still no help. Anyone know of this issue?
Thanks

How many miles on it? Is it shifting properly through the gears?

I got 104,000 miles. No problem with shifting and running. THX

Cayenne electrical problems
 

I'm having something similar, and I've done a lot of reading to see if I can fix it without getting raped at the local Porsche dealership. A lot of DIYers have found that water has gotten into the car and under the carpet due to clogged drains, and causes corrosion on wires that run under the carpet to the area where the battery is under the driver's seat. I don't have the link, but it's easy to check by pulling the carpet up and looking. Unfortunately for me, I guess, is that my floor was dry and I couldn't find any corrosion. I understand the Porsche makes a repair kit for the problem, although I can't find it anywhere. I was going to call Pelican Parts Monday and see of they could help. It sounds like a simple fix, if that's your problem, so good luck

Sounds like you are just driving on really crappy roads...or have a tire that is more worn that the others (or out of balance).