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 (Connector End Views By Name)
Description and Operation

Rear Drive Axle Description and Operation (Description and Operation)
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 (Programming and Relearning) for scan tool information

Circuit/System Verification

1. Engine running, observe the scan tool Rear Drive Clutch Status parameter. The scan tool should display TEMPORARILY LIMITED when stationary.
2. Verify that the following DTC's are not set along with DTC C039F:

* C0402
* C0403
* C0406
* C0407

• If any of the DTCs listed are set, diagnose those codes first. Refer to Diagnostic Trouble Code (DTC) List - Vehicle (Diagnostic Trouble Code (DTC) List - Vehicle).

3. Ensure 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).

• If a fluid level is below specifications, inspect the rear differential assembly for leaks and repair as necessary. Refill to the proper level, clear codes, and road test. Verify that DTC C039F is not set. If the DTC resets, proceed to Circuit System Testing.

Circuit/System Testing

Note: The rear drive clutch solenoid valve is calibrated with and is part of the rear differential clutch control module. Both components must be replaced as a matched set.

Verify DTC C039F is not set.

If the DTC is set, inspect the rear differential assembly for internal or external mechanical damage and repair as necessary. Clear codes and road test. Verify that DTC C039F is not set. If the DTC resets, replace the K47 rear differential clutch control module/Q48 rear drive clutch solenoid valve assembly.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

Control Module References (Programming and Relearning) for rear differential clutch control module replacement, setup, and programming