There is a receiver for the key fobs in thr rear of the vehicle. May be worth checking. It's located under the plastic panel that covers the area where lift gate latches when closed.

Edit ...see attached image I found from a random site...the red outline is the panel it's under.



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Usually its one of the antennas. There has been quite a few discussion thread here over the years. You may be able to find something with a search. They made some subtle changes in 2014. If no one pops in here by tomorrow and you don't find anything on your own, I'll try to take a look. The FAQ has some search tips.

 

Dunno if you fixed this be now, here are a couple threads with ideas. 9 times out of ten its one of the antennas, the other on is the passive entry module.

Jeep wont't start/key fob not detected

I own a 2011 Jeep Grand Cherokee Overland Summit. I have had two instances over the past three weeks when the vehicle would not start either by the key fob or the push button. The first incident occurred at the gas station after I had just finished filling the tank. Additionally the alarm went...

www.jeepforum.com

2011 Overland Passive Entry Antenna - Need Connector

Hi All, we damaged the connector for the passive entry antenna (pn for antenna 05026444AA) on our 2011 when we removed the spare tire surround (did not realize it was plugged in there) I have searched for the connector and am unable to locate one. Maybe I am not looking for the correct part...

www.jeepforum.com