• | 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. |
The rear differential clutch control module (CCM) receives messages from other modules over GMLAN which are needed to perform all wheel drive functions.
• | The ignition is ON. |
• | Ignition voltage is greater than 9.5 volts. |
The CCM receives an invalid message from the PCM, EBCM, modules over GMLAN which causes the CCM to deactivate.
All wheel drive indicator illuminates.
• | The condition for the DTC is no longer present. |
• | The DTC is not detected in 40 consecutive drive cycles. |
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.
All-Wheel Drive Description and Operation
• | Circuit Testing |
• | Wiring Repairs |
Control Module References for scan tool information
Verify that no DTCs are set in the ECM or EBCM.
⇒ | If DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle. |