Is faulty transfer case motor related or has an effect on no reverse on 2006 Grand Cherokee?

the reverse wont engage on my 2006 grand Cherokee, forward is ok. one mechanic says its transfer case motor or motors sensor.Please note: a) there is

the reverse won't engage on my 2006 grand Cherokee, forward is ok. one mechanic says its transfer case motor or motor's sensor.
Please note: a) there is eshing sound when I try to engage the reverse b) 4WD won't engage c) "4WD system malfunction" DTC shown on the scan tool

or:the reverse won't engage on my 2006 grand Cherokee, forward is ok. one mechanic says its transfer case motor or motor's sensor.Please note: a) there is eshing sound when I try to engage the reverse b) 4WD won't engage c) \"4WD system malfunction\" DTC shown on the scan tool

Tags:2006,note,reverse,