This bulletin applies to 2014-2015 Dodge RAM 2500 and 3500 trucks equipped with a diesel engine. The DEF level sensor may have a manufacturing defect. A MIL may be illuminated. DTCs P203B (reductant level sensor circuit performance), P203C (diesel exhaust fluid...reductant level sensor circuit low) and/or P203D (reductant level sensor circuit high) might be stored.
The DEF system uses a complex radio frequency type level sensor to detect the amount of fluid present in the DEF tank. As the fluid level in the tank decreases, the level sensor becomes exposed to air which alters the signal sent out by the sensor. The sensor translates the signal change into a fluid level and busses the information to the instrument panel cluster via the dosing control unit (DCU). A manufacturing defect in the level sensor may have occurred. Replace the DEF pump assembly and ensure that the DEF tank is approximately ½ full. Using WiTECH, perform a DEF reductant doser pump prime override test a total of 10 times to ensure that the DEF pump has been sufficiently primed and that all air has been purged from the pump and filter. Turn the ignition key on and ensure the DEF level gauge is reading properly.
The new module kit is available as P/N 68192659AC.