The C0561 code, specifically C0561-71, indicates a problem where the Electronic Brake Control Module (EBCM) receives invalid serial data from other vehicle modules. This issue can lead to the deactivation of critical systems such as the Anti-lock Braking System (ABS), traction control, and electronic stability control. Understanding this code is essential for vehicle owners and technicians who seek to diagnose and resolve braking system issues effectively.

What Does C0561-71 Mean?

C0561-71 signifies that the EBCM has detected an invalid message over the General Motors Local Area Network (GMLAN). The EBCM relies on data from various modules, including:

  • Body Control Module (BCM)
  • Engine Control Module (ECM)
  • Instrument Panel Cluster (IPC)
  • Transmission Control Module (TCM)

When any of these modules send incorrect data, the EBCM disables the ABS and traction control systems to prevent unsafe driving conditions.

Common Causes of C0561-71

Several factors can contribute to this error code:

  • Faulty Wiring or Connectors: Damaged or corroded wiring harnesses can disrupt communication between modules.
  • Module Malfunction: Any of the involved modules (BCM, ECM, IPC, TCM) may be malfunctioning or not communicating correctly.
  • Sensor Issues: Problems with wheel speed sensors or other related sensors can trigger this code.
  • Software Glitches: Occasionally, software bugs in one of the control modules can lead to erroneous data transmission.

Diagnosing C0561-71

To diagnose this code effectively, follow these steps:

1. Perform a Diagnostic System Check: Begin with a comprehensive check of all vehicle systems to identify any additional codes that may be present.

2. Inspect Wiring and Connectors: Examine all relevant wiring harnesses for signs of damage, corrosion, or loose connections.

3. Check Module Functionality: Using a scan tool, verify that each module is functioning correctly and communicating with the EBCM.

4. Test Sensors: Ensure that all related sensors are operational and providing accurate readings.

5. Clear Codes and Test Drive: After addressing any identified issues, clear the codes and perform a test drive to see if the C0561-71 code reappears.

Troubleshooting Tips

If you encounter the C0561-71 code, consider these troubleshooting tips:

  • Resetting Modules: Sometimes resetting the modules can clear temporary faults. Disconnecting the battery for a few minutes may help.
  • Consulting Technical Resources: Utilize repair manuals or online forums for specific vehicle guidance related to this code.
  • Professional Assistance: If you’re unable to resolve the issue, seeking help from a qualified technician with experience in GM vehicles can provide valuable insights.

FAQs About C0561

  • What does it mean when my vehicle shows C0561?
    This indicates that the EBCM has received invalid data from another module, leading to system disablement.
  • Can I drive my vehicle with this code?
    It is not recommended as it disables critical safety systems like ABS and traction control.
  • How much does it cost to fix C0561?
    The cost varies depending on the underlying issue but may range from $75 to $150 per hour for diagnostic labor.