For 1990-2009 cars only
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 receivedDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
System Disabled Information Stored Invalid Serial Data Received | -- | -- | -- | C0561 71 |
Circuit/System Description
The coupling 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 ECM, 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 100 consecutive drive cycles. |
Reference Information
Electrical Information Reference
Scan Tool Reference
Scan Tool Data List for EBCM or ECM
Circuit/System Verification
- Perform Diagnostic System Check - Vehicle.
- With Tech 2, view "Signals" Data Display list under EBCM or ECM.
- Refer to appropriate module for diagnosing any "invalid" signals.
- If no invalid signals are present, view "Signal Fault" data in "Enhanced DTC Data"
- Refer to appropriate module for diagnosing that intermittent faulted signal
| ⇒ | Diagnose any other Vehicle DTCs before attempting diagnosis of C0561. |
Repair Verification
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
