General Motors (GM) vehicles utilize an advanced diagnostic system to monitor various components and systems. One of the diagnostic trouble codes (DTCs) that may appear is C0561:71. This code indicates a problem with the electronic brake control module (EBCM) receiving invalid serial data. When this code is triggered, it can affect the vehicle’s stability control, traction control, and anti-lock braking systems.

The C0561:71 code specifically relates to the EBCM detecting an issue with the data it receives from other modules in the vehicle. This communication problem can lead to the deactivation of critical safety features, potentially compromising the vehicle’s handling and braking performance. Understanding the causes, symptoms, and solutions for this code is crucial for maintaining your GM vehicle’s safety and performance.

CodeDescription
C0561:71System Disabled Information Stored Invalid Serial Data Received

Causes of GM DTC C0561:71

The C0561:71 code can be triggered by various factors, all related to communication issues between the EBCM and other vehicle modules. Some of the most common causes include:

1. Faulty wiring or connections: Damaged, corroded, or loose wiring in the vehicle’s electrical system can disrupt the communication between modules. This is often the primary culprit behind the C0561:71 code.

2. Malfunctioning sensors: Wheel speed sensors, yaw sensors, or steering angle sensors may provide inaccurate data to the EBCM, leading to the invalid serial data error.

3. Software glitches: Outdated or corrupted software in the EBCM or other modules can cause communication errors and trigger the C0561:71 code.

4. Failing EBCM: In some cases, the EBCM itself may be malfunctioning, unable to properly process the data it receives from other modules.

5. Battery or alternator issues: Low voltage or inconsistent power supply can interfere with the proper functioning of vehicle modules, potentially causing communication errors.

It’s important to note that the C0561:71 code is often accompanied by other DTCs, which can provide additional clues about the root cause of the problem. Always check for related codes when diagnosing this issue.

Symptoms Associated with GM DTC C0561:71

When the C0561:71 code is present, you may notice several symptoms that indicate a problem with your vehicle’s stability and traction control systems. These symptoms can include:

  • Illuminated warning lights: The check engine light, ABS light, traction control light, or stability control light may come on and stay lit.
  • Disabled safety features: The anti-lock braking system (ABS), traction control, and stability control may be deactivated, reducing the vehicle’s safety capabilities.
  • Reduced engine power: In some cases, the vehicle may enter a “limp mode” with reduced engine power to prevent potential damage.
  • Unusual brake behavior: You may experience pulsating brake pedals or longer stopping distances due to the deactivation of ABS.
  • Stability issues: The vehicle may feel less stable during cornering or in adverse weather conditions due to the disabled stability control system.
  • Intermittent problems: The symptoms may come and go, making diagnosis challenging.

It’s crucial to address these symptoms promptly, as they can significantly impact your vehicle’s safety and performance. Do not ignore warning lights or unusual behavior from your vehicle’s braking and stability systems.

Diagnosing GM DTC C0561:71

Proper diagnosis of the C0561:71 code requires a systematic approach and may necessitate specialized tools. Here are the steps to diagnose this issue:

1. Use a scan tool: Connect a professional-grade OBD-II scan tool to read all stored DTCs. Look for additional codes that may provide more context.

2. Check for Technical Service Bulletins (TSBs): Research if GM has issued any TSBs related to the C0561:71 code for your specific vehicle model and year.

3. Inspect wiring and connections: Carefully examine all wiring and connectors related to the EBCM and other relevant modules. Look for signs of damage, corrosion, or loose connections.

4. Test sensors: Use appropriate testing equipment to verify the proper functioning of wheel speed sensors, yaw sensors, and steering angle sensors.

5. Check power supply: Ensure the battery and alternator are providing consistent and adequate power to all vehicle systems.

6. Perform a module communication test: Use a scan tool to verify proper communication between all relevant modules in the vehicle.

7. Update module software: Check if there are any available software updates for the EBCM or other related modules.

Remember, diagnosing complex electrical issues can be challenging. If you’re not confident in your ability to perform these tests, it’s best to consult a professional technician with experience in GM vehicle diagnostics.

Fixing GM DTC C0561:71

Once you’ve identified the root cause of the C0561:71 code, you can proceed with the appropriate fix. Here are some common solutions:

1. Repair or replace wiring: If damaged wiring or connections are found, repair or replace them as necessary. Ensure all connections are clean, tight, and properly insulated.

2. Replace faulty sensors: If any sensors are found to be malfunctioning, replace them with new, OEM-quality parts.

3. Update module software: If software glitches are suspected, update the EBCM and other relevant module software to the latest version provided by GM.

4. Replace the EBCM: In cases where the EBCM itself is faulty, it may need to be replaced. This should be done by a qualified technician to ensure proper installation and programming.

5. Address power supply issues: If battery or alternator problems are detected, repair or replace these components as needed.

6. Clear the codes and retest: After making repairs, clear all DTCs and test drive the vehicle to ensure the problem is resolved.

It’s important to note that some fixes, particularly those involving module replacement or programming, may require specialized equipment and knowledge. Consider seeking professional help for complex repairs to avoid potentially costly mistakes.

Preventing Future Occurrences of GM DTC C0561:71

To minimize the risk of encountering the C0561:71 code in the future, consider the following preventive measures:

  • Regular maintenance: Follow GM’s recommended maintenance schedule for your vehicle to keep all systems in optimal condition.
  • Protect electrical components: Shield wiring and connections from moisture and corrosion to prevent communication issues.
  • Use quality parts: When replacing components, opt for high-quality, OEM or OEM-equivalent parts to ensure compatibility and reliability.
  • Address issues promptly: Don’t ignore warning lights or unusual vehicle behavior. Addressing problems early can prevent more serious issues from developing.
  • Keep software updated: Stay informed about any available software updates for your vehicle’s modules and have them applied when recommended.

By following these preventive measures, you can help ensure your GM vehicle’s stability and traction control systems remain in good working order, reducing the likelihood of encountering the C0561:71 code in the future.

FAQs About GM DTC C0561:71

  • Can I drive my GM vehicle with the C0561:71 code present?
    While possible, it’s not recommended as safety systems may be compromised.
  • How much does it typically cost to fix the C0561:71 code?
    Costs vary widely, from $100 for simple repairs to $1000+ for module replacement.
  • Will the C0561:71 code clear itself over time?
    No, the code will remain until the underlying issue is fixed and the code is cleared.
  • Can aftermarket modifications cause the C0561:71 code?
    Yes, certain modifications can interfere with module communication and trigger this code.
  • Is the C0561:71 code covered under GM’s warranty?
    It may be, depending on your vehicle’s age, mileage, and the specific cause of the code.