C0561
DTC C0561
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC C0561 71
- System Disabled Information Stored Invalid Serial Data Received
DTC C0561 72
- System Disabled Information Stored Alive Counter Incorrect/Not Updated
DTC C0561 74
- System Disabled Information Stored Value of Signal Protection Calculation Incorrect
DTC C0561 7F
- System Disabled Information Stored Value of Signal Erratic
Circuit/System Description
The electronic brake control module (EBCM) receives serial data messages from the instrument panel module (IPM), the engine control module (ECM), the instrument panel cluster (IPC), and the transmission control module (TCM) 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
* Ignition ON.
* Ignition voltage is greater than 10 volts.
Conditions for Setting the DTC
The EBCM receives an invalid serial data message from another module or component.
Actions Taken when the DTC Sets
* The EBCM disables the antilock brake system (ABS), traction control for the duration of the ignition cycle.
* A driver information center message and/or a warning indicator may be displayed.
Conditions for Clearing the DTC
* The condition for setting the DTC is no longer present.
* The EBCM clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles.
Diagnostic Aids
This DTC indicates that there are no problems in the EBCM. The ECM, IPM, and the TCM should be checked for a possible fault.
Reference Information
Schematic Reference
Antilock Brake System Schematics (except JL7) (Antilock Brake System Schematics (Except JL7))Antilock Brake System Schematics (JL7) (Antilock Brake System Schematics (JL7))
Connector End View Reference
Component Connector End Views (Connector End Views By Name)
Description and Operation
ABS Description and Operation (Description and Operation)
Electrical Information Reference
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Circuit Testing (Circuit Testing)
* Wiring Repairs (Wiring Repairs)
* Connector Repairs (Connector Repairs)
Scan Tool Reference
Control Module References (Programming and Relearning) for scan tool information
Circuit/System Verification
Note: The diagnostic for DTC C0561 is covered in five different procedures. To determine which of the five procedures to follow, identify which symptom byte and sub code is set with DTC C0561. The sub code can be found in the scan tool Enhanced Diagnostics Data. Match up the DTC symptom byte and sub code in the table below and perform the procedure listed to the right of the table.
Circuit/System Testing
Procedure 1
This diagnostic detects invalid serial data from another module which causes the EBCM to deactivate ABS, traction control and the vehicle stability enhancement system.
1. Verify that no DTCs are set in the ECM, IPM or the TCM.
• If DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (Diagnostic Trouble Code (DTC) List - Vehicle).
2. Use the scan tool Enhanced Diagnostics Data screen to determine which module is transmitting the invalid signal.
3. The module that is transmitting the invalid data should not have any DTCs set.
• If the module has a DTC set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (Diagnostic Trouble Code (DTC) List - Vehicle).
Procedure 2
This diagnostic detects invalid serial data from the IPM to the EBCM regarding the traction control switch or the circuit.
1. Verify that DTC C0561 71 CB is not set.
• If DTC is set, refer to Traction Control/Stability Control Indicator Malfunction (Traction Control/Stability Control Indicator Malfunction) for traction control switch (TCS) diagnosis.
2. If no DTCs are set, refer to Symptoms - Antilock Brake System (Symptoms - Antilock Brake System).
Procedure 3
This diagnostic detects invalid serial data from the IPM to the EBCM regarding the cruise control sensor or circuit.
1. Verify that DTC B3794, C1002, P0571, P0572, P0573, P0575 or P0703 is not set.
• If DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (Diagnostic Trouble Code (DTC) List - Vehicle).
2. If no DTCs are set, refer to Symptoms - Cruise Control (Symptoms - Cruise Control).
Procedure 4
This diagnostic detects invalid serial data from the IPM to the EBCM regarding the brake pedal position sensor or circuit.
1. Verify that DTC C0277 or DTC C0278 is not set.
• If DTC is set, refer to DTC C0277 (C0277) or DTC C0278 (C0278) for brake pedal position sensor diagnosis.
2. If no DTCs are set, refer to Symptoms - Lighting (Symptoms - Lighting).
Procedure 5
This diagnostic detects invalid serial data from ECM module which causes the EBCM to deactivate ABS, traction control and the vehicle stability enhancement system.
Verify that no DTCs are set in the ECM.
If DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (Diagnostic Trouble Code (DTC) List - Vehicle).
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
Control Module References (Programming and Relearning) for module replacement, programming and setup