DTC Description: Notes

The SCR dosing system is an in-tank system with a DEF control module that controls the dosing pump and monitors Urea heating, level, quality, pressure and temperature. This dosing system is powered by battery voltage and an initialization signal from the Urea heater relay. The DEF control module activates priming, dosing, heating and purging of Urea using data provided by the Engine Control Module (ECM) via CAN communication. The DEF control module performs its own diagnostics and reports malfunctions back to the ECM. The ECM then decodes the error and converts it to a DTC.