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 ReceivedCircuit/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 is ON. |
| • | Ignition voltage is greater than 9.5 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
All wheel drive indicator illuminates.
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
Connector End View Reference
Description and Operation
All-Wheel Drive Description and Operation
Electrical Information Reference
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. |
