Antilock Brake System
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 4B
- System Disabled Information Stored Calibration Not Learned
DTC C0561 54
- System Disabled Information Stored Temperature High - Solenoid Over Temperature
DTC C0561 71
- System Disabled Information Stored Invalid Serial Data Received
Circuit/System Description
The electronic brake control module (EBCM) receives data from other modules (ECM, BCM, APIM, and Hybrid Powertrain Control Module-PIM), the multi-axis acceleration sensor module, and the steering angle sensor are needed to perform brake control functions. The EBCM must ensure that all serial data and sensor inputs are properly received and learned.
Conditions for Running the DTC
* Ignition ON.
* Ignition voltage is greater than 10 volts.
Conditions for Setting the DTC
DTC C0561 4B
This diagnostics detects if one or more of the module learning steps was not performed or failed during component replacement (New ECU/reprogrammed ECU).
DTC C0561 54
This diagnostics detects an over temperature condition with 1 of the 12 solenoids due to an extended ABS, traction control and the vehicle stability enhancement system event lasting more than 45 seconds.
DTC C0561 71
The EBCM receives an invalid serial data message/signal from another module which causes the EBCM to deactivate the antilock brake system, traction control and the vehicle stability enhancement system.
Action Taken When the DTC Sets
* The EBCM disables the antilock brake system, traction control and the vehicle stability enhancement system 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 the DTC is no longer present.
* It may take 2 ignition cycles to clear this DTC.
* The EBCM clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles.
Diagnostic Aids
DTC C0561 4B
The module set up was not performed after a programming event or the EBCM Relearn failed.
This DTC may set during a battery disconnect.
DTC C0561 54
Excessive traction control event for greater than 45 seconds.
DTC C0561 71
This DTC may set after a programming event.
Reference Information
Schematic Reference
Antilock Brake System Schematics [1][2]Antilock Brakes / Traction Control Systems
Connector End View Reference
Component Connector End Views Hybrid/EV Battery Pack X1 A4
Description and Operation
ABS Description and Operation Description and Operation
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Verification
Note: The battery must be able to maintain a charge during this brake sensor performance procedure. It is recommended that a charger/maintainer or equivalent be used to maintain proper battery voltage during this procedure.
1. Place the power button in the ON/RUN position.
2. Place the transmission in PARK.
Note: Do not depress the brake pedal during the EBCM relearn.
3. Using a scan tool access the EBCM, Configuration/Reset Functions, EBCM Relearn. The EBCM relearn procedure will verify valve and pressure sensor calibrations are correct.
Note: To ensure the complete brake modulator and high pressure accumulator (HPA) pressure relief procedure is allowed to occur; the brake controller must see 1 pedal apply with the propulsion system enabled, followed by a proper shutdown without applying the brake pedal.
4. Enable the propulsion system.
5. Apply and release the brake pedal.
Note: The power button must be in the OFF position, and without applying the brake pedal to ensure the brake modulator and high pressure accumulator (HPA) pressure relief occurs. This process will take approximately 1-3 minutes.
6. Place the power button in the OFF position, without applying the brake pedal.
7. Remove the remote keyless entry (RKE) transmitter and close all of the vehicle doors.
8. Wait approximately 1-3 minutes until the brake modulator and the high pressure accumulator (HPA) pressure relief is complete.
Note: The power button must remain in the ON/RUN position, with the engine OFF during the remainder of this diagnostic procedure, unless otherwise instructed.
9. Place the power button in the ON position, engine OFF, and do not apply the brake pedal.
10. Using the scan tool, select Data Display for the EBCM, scroll through the data list, select and accept the following:
* Master Cylinder Pressure Sensor
* Rear Brake Pressure Sensor
* Brake Pressure Sensor
* Accumulator Pressure Sensor
* Brake Controls Brake Pedal Position Sensor 5 V Reference
* Brake Controls Brake Pedal Position Sensor Input A
* Brake Controls Brake Pedal Position Sensor Input B
11. Power button ON, engine OFF, brakes not applied, verify the following sensor parameters are within the specified values:
* Brake Controls Brake Pedal Position Sensor 5 V Reference - Between 4.75-5.25 V
* Brake Controls Brake Pedal Position Sensor Input A - Between 0.4-0.8 V
* Brake Controls Brake Pedal Position Sensor Input B - Between 4.2-4.6 V
• If any of the parameters are not within the specified range, refer to DTC C029C, C120C, C129A-C129F, C12B1, or C12F8 C029C.
12. Power button ON, engine OFF, brakes not applied, verify the following sensor parameters are within the specified values:
* Master Cylinder Pressure Sensor Input - Less than 100 kPa (15 psi)
* Rear Brake Pressure Sensor - Less than 100 kPa (15 psi)
* Brake Pressure Sensor Input - Less than 100 kPa (15 psi)
* Accum. Pressure Sensor - Less than 800 kPa (116 psi)
• If any of the parameters are not within the specified range, replace the Q5 brake pressure modulator valve.
13. Perform a hydraulic check, refer to Brake Hydraulic and Assist System Diagnosis Brake Hydraulic and Assist System Diagnosis.
14. If the Brake Hydraulic and Assist System tests normal, replace the Q5 brake pressure modulator valve and verify DTC does not reset. If the DTC resets, replace the K17 EBCM.
DTC C0561 54
This diagnostic detects an over temperature condition with 1 of the 12 solenoids due to an extended ABS, traction control and the vehicle stability enhancement system event lasting more than 45 seconds. This does not indicate a failure with the EBCM. If the DTC continues to set under normal conditions, then replace the K17 EBCM.
DTC C0561 71
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. Use the scan tool to determine which module is transmitting the invalid signal.
2. 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.
3. If the module has no DTCs set, refer to DTC U0100-U02FF U0100.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedures:
* Electronic Brake Control Module with Brake Pressure Modulator Valve Replacement Electronic Brake Control Module with Brake Pressure Modulator Valve Replacement
* Control Module References Control Module References for EBCM replacement, programming and setup