For 1990-2009 cars

### Diagnostic Instructions

• | 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 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

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

All-Wheel Drive Description and Operation

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Scan Tool Reference

Control Module References 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 .