Diagnostic Instructions
DTC Descriptor
DTC C0561 71: System Disabled Information Stored Invalid Serial Data Received
DTC C0561 72: System Disabled Information Stored Alive Counter Incorrect or not Updated
DTC C0561 74: System Disabled Information Stored Value of Signal Protection Calculation Incorrect
Circuit/System Description
The electronic brake control module (EBCM) receives messages from other modules over GMLAN which are needed to perform antilock brake system (ABS), vehicle stability enhancement system (VSES), or traction control system (TCS) functions.
Conditions for Running the DTC
| • | The ignition switch is in the ON position. |
| • | Ignition voltage is greater than 9.5 volts. |
Conditions for Setting the DTC
The EBCM receives an invalid message from another module over GMLAN which causes EBCM to deactivate ABS, VSES, TCS, etc.
Action Taken When the DTC Sets
One or more of the following actions may occur:
| • | The EBCM disables the ABS/TCS/VSES for the duration of the ignition cycle. |
| • | The dynamic rear proportioning (DRP) may be disabled and the Brake Warning indicator may turn ON. |
| • | The Stability Caution indicator turns ON. |
| • | The driver information center (DIC) displays the SERVICE STAB SYS message. |
| • | The DIC displays the TRACTION FAILED message. |
Conditions for Clearing the DTC
| • | The condition for the DTC is no longer present. |
| • | The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles. |
Reference Information
Schematic Reference
Antilock Brake System Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
ABS Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References
for Scan Tool Information
Circuit/System Verification
- Perform the Diagnostic System Check Vehicle. Diagnose any other DTCs before attempting to diagnosis of C0561.
- With a Tech 2, view the Invalid Signal Data Display.
- If no invalid signal are present, view Signal Fault Data in the Enhanced DTC Data.
- Refer to appropriate module for diagnosing the invalid message data.
- Do not replace the EBCM due to this DTC fault.
Repair Verification
Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
