P20FF

P20FF-(DIESEL EXHAUST FLUID) REDUCTANT CONTROL MODULE PERFORMANCE





For a complete wiring diagram, refer to the Wiring Information.

Theory of Operation

The Diesel Exhaust Fluid (DEF) Dosing Control Unit is used to control the operation and monitoring of the Diesel Exhaust Fluid system. The DEF Dosing Control Unit shares information with the Powertrain Control Module over the J1939 Data Link.

- When Monitored:
Continuously with the ignition on.

- Set Condition:
The DEF Dosing Control Unit reports an internal error to the PCM over the J1939 Data Link.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Pre-Diagnostic Troubleshooting Procedure.
ACTIVE DTC
1. Ignition on, engine not running.
2. With the scan tool, read DTCs.

Is the DTC Active?

Yes

- Replace the DEF Dosing Control Unit. Diesel Exhaust Fluid Dosing Control Unit - Removal.
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test.

No

- Perform the INTERMITTENT CONDITION - 6.7L diagnostic procedure. Intermittent Condition Test