Included in the level indicator is a temperature sensor. The level sensor only has the capability of reading 0, 33, 66, 100. The level sensor consists of 4 electrodes that measure the fluid level through conductivity. 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. Below -30F (-34C) the DEF system will not be activated by the PCM. Ensure that the DEF tank is approximately one-half full. 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). 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).ДЄ manufacturing defect in the level sensor may have occurred if built on or after April 1, 2014, and on or before Sept. As the fluid level in the tank decreases, the level sensor becomes exposed to air which alters the signal sent out by the sensor. Power Service, K100, Standyne, and Flash Lube for example are brands that we see no problems. The DEF system uses a complex radio frequency type level sensor to detect the amount of fluid present in the DEF tank. Our advice is to only run products that were made for diesel fuel. A defect may be present with the DEF (diesel exhaust fluid) level sensor. I was driving around in the mountains and sitting idle while I was trying to register the Uconnect system when I got a message that said Service Def System See Dealer. This bulletin applies to 2014-2 trucks equipped with a 6.7L Cummins diesel engine. Hey Guys, I just purchased a 20 Laramie with 6300 miles today.

2014 ram service def system see dealer