Great question; I would first try with a different remote key fob to eliminate that possibility.
Unfortunately, there's not a lot of information available on this system.
I have attached what I could find from Mopar Tech Authority.
There are sensors in the door handles that communicate with the Radio Frequency Hub Module (RFHM) via CAN Bus.
The RFHM is located behind the back seat and has four antennas, one in each door, left front and right front, behind the back seat, and the passenger side dash area.
If you have a scan tool capable of reading the RFHM for trouble codes, that would be my next step.
As stated in the attached information, the RFHM is not repairable, so it would have to be replaced if no module input troubles were present.
Hopefully, this will help answer some of your questions, and others will also chime in.
RF Hub.pdf
Passive Entry Diagram.jpg
2014 RAM 3500 (Aisin) 3.73 4X4 Limited Crew Cab Long Bed DRW. Oil Bypass Filter, Fuel Filtration Kit, and 50 Gallon Aux Fuel Tank.
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