C039F

DTC C039F

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC C039F 00
- AWD Torque Signal

Circuit/System Description

The Rear Differential Clutch Control Module monitors the amount of torque transferred through the rear axle. If there is a mechanical malfunction that inhibits the torque transfer process the module will then set DTC C039F.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

A mechanical malfunction exists that inhibits the torque transfer process.

Action Taken When the DTC Sets

One or more of the following actions may occur:

* All-wheel drive (AWD) is disabled.

* Service Rear Axle is displayed on the driver information center.

Conditions for Clearing the DTC

* The condition for setting the DTC is no longer present.

* The DTC is not detected in 40 consecutive ignition cycles.

Reference Information

Schematic Reference

Rear Axle Schematics Electrical Diagrams

Connector End View Reference

Component Connector End Views Fuel Pump and Level Sensor Assembly

Description and Operation

Rear Drive Axle Description and Operation Description

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Control Module References for scan tool information

Circuit/System Verification

Note: The Q48 Rear Drive Clutch Solenoid Valve is calibrated with and is part of the K47 Rear Differential Clutch Control Module. Both components must be replaced as a matched set.

1. Engine running and vehicle stationary.

2. Verify the scan tool Rear Drive Clutch Status parameter is Temporarily Limited.

• If not Temporarily Limited

1. Verify that DTC C0402, C0403, C0406, or C0407 is not set.

• If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle.

• If none of the DTCs are set

2. Verify there are no internal/external leaks or mechanical damage and that all differential fluid levels are at the proper levels. Refer to Rear Axle Lubricant Level Inspection Procedures and Differential Clutch Oil Inspection Differential Clutch Oil Inspection.

3. Clear DTCs and road test the vehicle.

4. Verify that DTC C039F is not set.

• If the DTC is set, replace the K47 Rear Differential Clutch Control Module.

• If the DTC is not set

5. All OK.

• If Temporarily Limited

3. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

Control Module References Control Module References for Rear Differential Clutch Control Module replacement, programming, and setup.