Dodge Repair Questions? Ask a Mechanic for Answers ASAP
It sounds like you may be having trouble with either the BCM (body control module) or the ignition switch.
How much testing do you want to do yourself?
You will need a multimeter and a scan tool preferably.
If you have a scan tool:
Verify the ignition switch position is indicated correctly in the Body Control Module (BCM) and the Front Control Module (FCM). The ignition switch has a built in position sensor that reports the position of the ignition switch to the BCM. The BCM then broadcasts the position to all the modules that need the information on the BUS circuit.
If you have a multimeter:
Check circuit T751 and T752 at the Intelligent Power Module (IPM) for voltage with the engine running. These circuits should have battery voltage only during cranking and should go to 0 volts with the vehicle running. If there is any voltage on these circuits, the FCM will de-energize the accessory relay, which causes the named circuits to shut down, even with the vehicle running. Voltage typically comes from the wire harness due to battery acid from the battery. Voltage gets tracked into these circuits and causes the FCM to shut down the accessory relay. Another cause could be any add-on system such as a remote starter system wired into these circuits.
I would probably suspect a bad ignition switch or a wiring issue in the fuse box in that case.
Did you check the accessory relay in the under hood fuse box yet?