I'm new to this site so maybe this question has been asked. I reciently bought a 06 limited and when I backup the message center says "Service Rear Park Assist System", I did notice that the previece owner had hit something on the rear drivers side (paint flaking off). I'm a good with mechanical things, Is there any way I can trouble shoot the sensors or something to fix this problem?
You can find some info about this system on the next site; http://www.wkjeeps.com/wk_park_assist.htm
You could start with cleaning the connectors of the sensors. Some times the shift module can cause this message popping up as well.
JEEP Grand Cherokee 4.7 Lmtd 2004
HID 8000K in low and fog / Quad Squad member
KYB Gas-a-Just shocks / Pirelli Scorpion ATR 245/65/17 - Transgo reprogramming shiftkit.