How to Clear Cummins Fault Codes Without Scan Tool

How to Clear Cummins Fault Codes Without Scan Tool

Have you ever encountered a situation where the “Check Engine” light comes on in your Cummins-powered vehicle, and you have no access to a scan tool? Fear not, because in this article, we will guide you on how to clear Cummins fault codes without a scan tool.

What are Cummins Fault Codes?

Cummins fault codes are diagnostic codes that indicate a problem with the engine or any of its components. When a fault is detected by the engine control module (ECM), it stores the corresponding fault code in its memory. These fault codes can help you identify the issue and take appropriate action to resolve it.

Before Clearing Fault Codes

Before attempting to clear the fault codes, it is crucial to address the underlying problem causing the fault codes to appear. Clearing the codes without fixing the issue may cause the “Check Engine” light to turn on again shortly after.

Manual Clearing of Cummins Fault Codes

If you don’t have access to a scan tool, you can still clear Cummins fault codes manually. Here’s how:

  1. Turn off the engine and remove the key from the ignition.
  2. Locate the ECM fuse or disconnect the negative battery terminal to cut power to the ECM. Refer to your vehicle’s manual for guidance.
  3. Wait for at least 15 minutes to completely drain the power from the ECM.
  4. Reconnect the ECM fuse or negative battery terminal to restore power.
  5. Start the engine and let it idle for a few minutes.
  6. Check if the fault codes have been cleared by observing the “Check Engine” light. If the light remains off, the fault codes have been successfully cleared.

Please note that this manual clearing method may not work for all Cummins engines and could vary depending on the vehicle model. It is always best to refer to the specific instructions provided in your vehicle’s manual.

Benefits of Clearing Fault Codes

Clearing fault codes can bring several benefits to Cummins engine owners:

  • Improved Performance: Resolving the underlying issue causing the fault codes can lead to better engine performance and fuel efficiency.
  • Reduced Repair Costs: Identifying and addressing the problem early on can prevent further damage, potentially saving you from expensive repairs.
  • Peace of Mind: Eliminating the “Check Engine” light and knowing that your engine is functioning properly can provide peace of mind during your travels.

Preventing Future Fault Codes

While clearing fault codes is essential, taking preventive measures can help minimize the occurrence of future faults. Here are some tips:

  1. Maintain Regular Servicing: Adhering to the recommended maintenance schedule, including oil and filter changes, can keep your engine in optimal condition.
  2. Use Quality Fuel and Additives: Choosing high-quality fuel and additives can reduce the risk of fuel-related issues.
  3. Monitor Fluid Levels: Regularly check and maintain proper fluid levels, including coolant and oil.
  4. Address Warning Signs Promptly: If you notice any unusual sounds, vibrations, or changes in performance, have them inspected by a qualified technician.
  5. Keep Air Filters Clean: Dirty air filters can restrict airflow and affect engine performance. Regularly clean or replace them as needed.

Frequently Asked Questions On How To Clear Cummins Fault Codes Without Scan Tool

How Do I Clear Cummins Fault Codes Without A Scan Tool?

To clear Cummins fault codes without a scan tool, you can try disconnecting the battery for a few minutes. This may reset the system and clear the codes.

Can I Use A Smartphone App To Clear Cummins Fault Codes?

Unfortunately, clearing Cummins fault codes typically requires a scan tool specifically designed for Cummins engines. Smartphone apps may not have the necessary capabilities to clear these codes.

What Are The Risks Of Clearing Cummins Fault Codes Without A Scan Tool?

Clearing Cummins fault codes without a scan tool can be risky as it may not address the underlying issue. It is important to identify and resolve the root cause of the fault codes to ensure proper functioning of the engine.

Is It Necessary To Clear Cummins Fault Codes?

Clearing Cummins fault codes is not always necessary. If the issue causing the fault codes has been resolved and the engine is functioning properly, the codes may clear themselves over time. However, it is recommended to address the root cause to prevent further problems.

Should I Consult A Professional To Clear Cummins Fault Codes?

Consulting a professional is recommended when dealing with Cummins fault codes. They have the expertise to diagnose the issue accurately and clear the codes using specialized tools, ensuring the problem is properly resolved.


In conclusion, although having access to a scan tool is convenient for clearing Cummins fault codes, it is still possible to clear them without one. By following the manual clearing method and addressing the underlying issue, you can maintain the performance and reliability of your Cummins-powered vehicle. Remember to consult your vehicle’s manual for specific instructions and consider preventive measures to minimize the occurrence of future fault codes.

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