Transfer Case - Getrag 790

DTC C0561

Diagnostic Instructions

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

DTC Descriptor
DTC C0561 71
- System Disabled Information Stored Invalid Serial Data Received

Circuit/System Description

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

Conditions for Running the DTC

Ignition voltage is greater than 9.5 volts.

Conditions for Setting the DTC

The CCM receives an invalid message from the ECM or EBCM, over serial data 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), DIC message.
* Service All Wheel Drive (Service AWD), DIC message.

Conditions for Clearing the DTC

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

Diagnostic Aids

DTC C0561 is an indicator that the CCM receives an invalid message from the ECM or EBCM , and does not necessarily indicate a fault is present with the CCM. This DTC should not be used as a fault indicator, but rather as a symptom to assist in the diagnosis of these other systems.

Reference Information
Schematic Reference

All-Wheel Drive Schematics (Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

All-Wheel Drive Description and Operation (All-Wheel Drive Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information

Circuit/System Verification

Verify that no DTCs are set in the ECM or EBCM.

If DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (Diagnostic Trouble Code Descriptions).