Ram Trucks Have Faulty DEF Sensor
This bulletin applies to 2014-2015 Ram 2500 and 3500 trucks equipped with a 6.7L Cummins diesel engine. A defect may be present with the DEF (diesel exhaust fluid) level sensor.
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 this signal change into a fluid level and buses the information to the IPC (instrument panel cluster) via the DCU (dosing control unit).
A manufacturing defect in the level sensor may have occurred if built on or after April 1, 2014, and on or before Sept. 27, 2014.
There may be a MIL on. DTCs may be present, including P203B (reductant level sensor circuit performance), P203C (diesel exhaust fluid reductant level sensor circuit low) or P203D (diesel exhaust fluid reductant level sensor circuit high).
Replace the DEF pump assembly. Ensure that the DEF tank is approximately one-half 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 on and ensure that the DEF level gauge is reading correctly.
68192659AC...............Module kit, urea pump/level unit
68035704AB...............Diesel exhaust fluid (1 gallon)
68056278AB...............Diesel exhaust fluid (2.5 gallon)