If the engine does not crank (or cranks but won't start), the wireless control module (WCM) may have locked up. This is due to static discharge through the ignition key. A revised model should be installed, but simply disconnecting the negative terminal of the battery for thirty seconds will temporarily reset the module so you can start the car.Google+
Car Problem Reports
Dodge Ram 3500 Locked up WCM may cause engine cranking problems
Dodge Ram 3500 Problem
Average Mileage: 45,990 mi (30,000 mi - 61,980 mi)
Visitor, 2007 Dodge Ram 3500
07 Dodge Ram 3500. Had to have it towed to dodge dealer and $450 for a component the size of a credit card or business card case.
Visitor, 2006 Dodge Ram 3500, 30,000 mi
Locked up WCM may cause engine cranking problems
Verified for the Dodge Ram 2500 diesel Cranks but won't start, the wireless control , Disconnected the negative terminal of the battery to reset the module so truck can start ...
Power when key is on; security horn for 3 Min with flashing lights; starter failed to function. WCM had failed to recognize remote key fob. New WCM install and programed @ dealership. $430. So much for Christmas.