Flash: Dosing Control Unit (DCU) Diagnostic And System Improvements
This bulletin involves reprogramming the DCU with the latest available software and if necessary replacing the unit.
Some customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation, a technician may find the following Diagnostic Trouble Codes (DTCs):
P207F - Reductant Quality Performance.
P202C - Reductant Tank Heater Control Circuit High.
P203B - Reductant Level Sensor 1 Circuit Performance.
