• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
• Review Strategy Based Diagnosis for an overview of the diagnostic approach.
• Diagnostic Procedure Instructions provide an overview of each diagnostic category.

For symptom byte information, refer to Symptom Byte List.

The rear differential clutch control module detects a series of overheat events that have occurred in the rear differential clutch system.

• The engine is running.
• The engine speed is above 400 rpm.

The rear differential clutch control module detects a series of overheat events on the clutch.

• The electronic limited slip control is disabled.
• The AWD SERVICE message is displayed in the driver information center.

• The condition for the DTC is no longer present.
• The DTC is not detected in 40 ignition cycles.

Excessive differentiation (wheel/tire slip) can cause high temperatures in the rear drive axle and DTC C122F may set.

Rear Axle Schematics

Master Electrical Component List

Rear Drive Axle Description and Operation

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

Control Module References for scan tool information

1. Ignition ON.
2. Verify DTC C122F is not set.
• If the DTC is set
1. Ignition OFF.
2. Allow 30 min for the clutch to cool completely down.
3. Perform key cycle, ignition OFF then ON.
4. Clear DTC.
5. Verify DTC C122F is not set.
• If the DTC is set, replace K47 Rear Differential Clutch Control Module.
• If the DTC is not set.
6. All OK.
• If the DTC is not set
3. All OK.

Perform the Diagnostic Repair Verification after completing the repair:Diagnostic Repair Verification

For control module replacement, programming, and setup refer to:Control Module References