DTC Description: Notes

The SCR dosing system is an in-tank system with a DEF supply pump assembly 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 DEF control module. The DEF supply pump assembly activates Priming, dosing, heating and purging of DEF using data provided by the Engine Control module (ECM) via CAN communication. The DEF supply pump assembly performs its own diagnostics and reports malfunctions back to the ECM. The ECM then decodes the error and converts it to a DTC.