Rear Drive Axle

DTC C0561

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach. Initial Inspection and Diagnostic Overview
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC C0561 71

System Disabled Information Stored Invalid Serial Data Received

Diagnostic Fault Information





Circuit/System Description

The rear differential clutch control module (CCM) receives messages from other modules over GMLAN which are needed to perform all wheel drive functions.

Conditions for Running the DTC

* The ignition switch is in the ON position.
* Ignition voltage is greater than 9 volts.

Conditions for Setting the DTC

The CCM receives an invalid message from the PCM, EBCM, modules over GMLAN which causes the CCM to deactivate.

Action Taken When the DTC Sets

One or more of the following actions may occur:

* All Wheel Drive Off (AWD Disabled)
* Service All Wheel Drive (Service AWD)

Conditions for Clearing the DTC

* The condition for the DTC is no longer present.
* The DTC is not detected in 40 consecutive drive cycles.

Circuit/System Verification

1. Perform Diagnostic System Check - Vehicle. Initial Inspection and Diagnostic Overview
^ Diagnose any other Vehicle DTCs before attempting diagnosis of C0561.

2. With Tech 2, view Data Display list under ECM or EBCM, and review the accelerator pedal signal or the wheel speed signals for proper operation.
^ If there is no DTCs or invalid data in the ECM or EBCM, replace the CCM.

Repair Instructions

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

Programming and Relearning Programming and Relearning for CCM replacement, setup, and programming