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: CAN-Bus Invalid DataCircuit/System Description
The electronic brake control module (EBCM) receives messages from the engine control module (ECM), and the transmission control module (TCM) over GMLAN which are needed to perform ESP or TCS functions.
Conditions for Running the DTC
| • | Ignition ON. |
| • | Ignition voltage is greater than 8 volts. |
Conditions for Setting the DTC
The EBCM receives an invalid message from either the ECM or TCM over GMLAN which causes EBCM to deactivate TCS, ESP and EBD.
Action Taken When the DTC Sets
| • | The EBCM disables the Traction Control System (TCS)/Electronic Stability Control (ESP) for the duration of the ignition cycle. |
| • | A multi function display (MFD) message and/or a warning indicator may be displayed. |
Conditions for Clearing the DTC
The condition for setting the DTC is no longer present.
Reference Information
Schematic Reference
Antilock Brake System Schematics
Connector End View Reference
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
Verify that no DTCs are set in the ECM or TCM.
| ⇒ | If DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
