If the engine cranks but does not start, or starts and stalls, the fuses should be inspected, especially the power door locks fuse. The power door lock fuse provides power to a module that sends the Powertrain Control Module (PCM) the "OK to start" signal.
Car Problem Reports
Dodge Ram 2500 Inspect Fuses if Engine Cranks But Does Not Start
Dodge Ram 2500 Problem
Visitor, 2001 Dodge Ram 2500, 122,200 mi
Starts one day, then maybe not the next day. when fails to start, it acts like it wants to, then when you let off the key, it will try to run. we replaced the oxygen sensor