Whew ! Hope it is a sensor issue and not the motor.
Got over 80,000 miles on my 2007 build, so stuff like this occupies your thoughts some what.
As Midnight states its always worth paying for experienced Technicians (if you can find them) no point in guessing.
Out of interest what scanner would be useful to have for the CRD
My local Jeep dealers been very helpful over the last few years, but the franchise was passed on a year ago, everyone left, but the MOST important head tech stayed, however he's now pissed off so he's leaving, (along with the 2nd intake of staff) and taking his two good proteges with him