P06F3

P06F3-(DIESEL EXHAUST FLUID) REDUCTANT CONTROL MODULE INTERNAL TEMPERATURE SENSOR CIRCUIT HIGH





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 after treatment Diesel Exhaust Fluid Dosing Control Unit is equipped with an internal temperature sensor, which monitors the temperature inside the control unit during operation. The DEF Dosing Control Unit shares this information with the Powertrain Control Module over the J1939 Data Link. Diesel exhaust fluid injection into the after treatment system is disabled.

- When Monitored:
This monitor runs during normal operation when dosing is being commanded by the DEF Dosing Control Unit.

- Set Condition:
The internal temperature of the DEF Dosing Control Unit is above 114°F [238°C] for more than five seconds.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Pre-Diagnostic Troubleshooting Procedure.

1. CHECK THE DEF DOSING CONTROL UNIT FOR PROPER MOUNTING

NOTE: Perform the diagnostics for this DTC regardless or whether code is active or stored.

1. Visually inspect to ensure that the DEF Dosing Control Unit is mounted in the correct location on the vehicle.
2. Check that all the fasteners are properly installed and secured.

Is the DEF Dosing Control Unit properly installed?

Yes

- Go To 2

No

- Re-secure the DEF Dosing Control Unit properly.
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test.

2. CHECK FOR AN OBSTRUCTION OF AIRFLOW TO THE DEF DOSING CONTROL UNIT
1. Visually inspect for excessive debris on or around the DEF Dosing Control Unit.
2. Visually inspect for any aftermarket brackets or shields that can obstruct airflow to the DEF Dosing Control Unit.

Is there any obstructions to the airflow to the DEF Dosing Control Unit?

Yes

- Repair the cause of the obstruction to the DEF Dosing Control Unit.
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test.

No

- Erase the DTC and test drive the vehicle. If the DTC returns, replace the DEF Dosing Control Unit. Diesel Exhaust Fluid Dosing Control Unit - Removal.
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test.