Cummins Fault Code Spn 5585 Fmi 18 : Troubleshooting Tips

The Cummins fault code SPN 5585 FMI 18 indicates a fault in the aftertreatment diesel particulate filter system. This fault code requires diagnosis by a certified technician for proper troubleshooting.

When dealing with this fault code, it is important to address it promptly to prevent potential engine damage and ensure optimal performance. Understanding the specifics of the fault code and taking appropriate action can help in resolving the issue efficiently.

By following recommended maintenance procedures and consulting with professionals, you can effectively deal with the SPN 5585 FMI 18 fault code for your Cummins engine. Taking proactive steps will enhance the longevity and reliability of your engine system.

Understanding Cummins Fault Codes

What Are Fault Codes?

Fault codes are numeric or alphanumeric codes that indicate a specific issue on a Cummins engine or system.

How Are Fault Codes Generated?

Fault codes in a Cummins engine are generated based on diagnostic tests run by the engine control module.

Importance Of Fault Code Troubleshooting

Troubleshooting fault codes promptly helps identify and resolve issues, ensuring optimal engine performance.

Cummins Fault Code Spn 5585 Fmi 18  : Troubleshooting Tips


Overview Of Spn 5585/fmi 18 Fault Code

Cummins Fault Code SPN 5585/FMI 18 indicates a fault related to the Engine Oil Filter Restriction. When this fault code is triggered, it is essential to address it promptly to prevent potential engine issues.

Explanation Of Spn 5585/fmi 18

In simple terms, SPN 5585/FMI 18 signifies an abnormal restriction in the engine oil filter, which can lead to inadequate lubrication and potential damage to engine components if not resolved.

Common Causes Of Spn 5585/fmi 18

  • Dirty or clogged engine oil filter
  • Issues with the oil filter housing
  • Incorrect or low-quality engine oil being used

Impact Of Spn 5585/fmi 18 On Engine Performance

Ignoring SPN 5585/FMI 18 can result in reduced engine performance, increased wear on engine components, and potential engine malfunction. It is crucial to address this fault promptly to ensure the proper functioning of the engine.

Troubleshooting Spn 5585/fmi 18

When it comes to diagnosing and resolving issues related to Cummins Fault Code SPN 5585/FMI 18, it’s important to follow a methodical troubleshooting process. By using the right diagnostic tools and techniques, as well as analyzing fault code data, you can efficiently identify and address the problem. This section will guide you through step-by-step troubleshooting, discuss the tools and techniques required, and provide some common tips to help you get the job done effectively.

Step-by-step Troubleshooting Process

  1. Start by physically inspecting the affected components or areas related to SPN 5585/FMI 18. Look for any visible signs of damage, loose connections, or abnormalities.
  2. If no physical issues are found, proceed to check the wiring harness and connectors. Ensure that there are no loose or corroded connections that could interfere with proper communication.
  3. Next, use a suitable diagnostic tool to retrieve the fault code information and perform a thorough scan of the system. This will help identify any additional fault codes that may be related to the issue at hand.
  4. Analyze the fault code data carefully. Look for specific parameters, values, or patterns that indicate potential causes or contributing factors for SPN 5585/FMI 18.
  5. Based on the fault code data analysis, refer to Cummins troubleshooting guides or technical information resources for the specific engine model or system you are working on. Follow the recommended diagnostic procedures related to SPN 5585/FMI 18 to further pinpoint the problem.
  6. If necessary, conduct further tests or inspections as guided by the troubleshooting procedures. This may involve checking sensor readings, performing voltage tests, or using other specialized diagnostic tools.
  7. Once a potential issue is identified, take appropriate steps to resolve it. This may include repairing or replacing faulty components, adjusting parameters, or performing system recalibration.
  8. After completing the troubleshooting and repair process, clear the fault codes and perform a final system test to verify that the issue has been resolved.

Diagnostic Tools And Techniques

In order to effectively troubleshoot SPN 5585/FMI 18, it is crucial to have the right diagnostic tools and techniques at your disposal. These tools can help you retrieve fault code information, perform system scans, and access relevant technical resources. Here are some commonly used diagnostic tools and techniques:

  • OBD-II scanners: These handheld devices allow you to read and clear fault codes from the engine control module (ECM), providing valuable information about the issues that need to be addressed.
  • Data loggers: These tools capture and record relevant engine parameters over a period of time. They can help identify abnormal patterns or trends that may be causing the fault code.
  • Service manuals and technical resources: These references provide detailed troubleshooting procedures, diagnostic charts, and wiring diagrams specific to Cummins engines. Utilize these resources to guide your troubleshooting efforts.

Analyzing Fault Code Data

When analyzing fault code data related to SPN 5585/FMI 18, pay attention to the following:

  • Actual values: Take note of the actual values associated with the fault code. Compare them to the specified operating ranges provided in technical resources to determine if any values are out of range.
  • Frequency of occurrence: If the fault code recurs frequently, it could indicate a persistent issue that requires thorough investigation and repair.
  • Co-occurring fault codes: Look for any other fault codes that are present alongside SPN 5585/FMI 18. They may provide additional insights into underlying issues or common causes.

Common Troubleshooting Tips

In addition to following the step-by-step troubleshooting process and using the right diagnostic tools, here are some common tips to keep in mind:

  • Ensure that the engine is shut off and all electrical connections are secure before conducting any inspections or repairs.
  • Clean and inspect sensor connectors regularly to prevent corrosion and ensure proper communication.
  • Consider performing software updates or ECM reprogramming if recommended by Cummins to address known issues or improve system performance.
  • Regularly review and follow Cummins maintenance schedules and guidelines to prevent potential issues.
  • Consult with Cummins technical support or authorized service providers if you encounter complex or recurring problems related to SPN 5585/FMI 18.

Preventive Measures

Regular maintenance practices, best practices for engine operation, and monitoring and addressing potential issues are essential preventive measures to keep your engine in peak condition and prevent the occurrence of Cummins fault code SPN 5585 FMI 18. By following these preventive measures, you can minimize the risk of encountering this fault code and ensure the smooth operation of your Cummins engine.

Regular Maintenance Practices

Regular maintenance is crucial in preventing the occurrence of Cummins fault code SPN 5585 FMI 18. Scheduled maintenance such as oil changes, filter replacements, and inspections of electrical connections can help identify and address potential issues before they escalate. Maintaining proper coolant levels and ensuring exhaust systems are in good condition also contribute to the prevention of this fault code.

Best Practices For Engine Operation

Adhering to best practices for engine operation is vital in preventing fault code SPN 5585 FMI 18. This includes adhering to recommended load limits and operating the engine at optimal temperatures. Avoiding idling for extended periods and performing pre-operational checks can also help prevent the occurrence of this fault code.

Monitoring And Addressing Potential Issues

Regularly monitoring engine performance and addressing any issues promptly can prevent the occurrence of Cummins fault code SPN 5585 FMI 18. Using diagnostic tools to identify and rectify potential issues, maintaining a log of engine performance, and seeking professional assistance when needed are integral in preventing this fault code.

Seeking Professional Help

When encountering Cummins fault code SPN 5585 FMI 18, seeking professional help is crucial to ensure the issue is addressed effectively. Let’s explore when to involve a certified Cummins technician, the benefits of professional assistance, and finding authorized service centers.

When To Involve A Certified Cummins Technician

Experiencing the aforementioned fault code demands the involvement of a certified Cummins technician. Any attempt to address the issue without proper expertise may lead to further complications.

Benefits Of Professional Assistance

Professional assistance guarantees precise diagnosis and effective resolution of the fault code. Expertise in handling Cummins engines ensures optimal performance and reliable operation.

Finding Authorized Service Centers

Locating authorized service centers is essential to ensure the fault code is addressed by skilled technicians with access to authentic parts and state-of-the-art diagnostics tools.

Cummins Fault Code Spn 5585 Fmi 18  : Troubleshooting Tips


Case Studies

When it comes to troubleshooting Cummins fault code SPN 5585 FMI 18, case studies can provide valuable insights and real-life examples. By exploring successful resolutions and the challenges faced during troubleshooting, we can learn important lessons about this specific fault code. Let’s dive into these case studies and see what we can learn.

Real-life Examples Of Spn 5585/fmi 18 Troubleshooting

Real-life examples of troubleshooting SPN 5585/FMI 18 can shed light on the complexities involved and the strategies employed to resolve the issue. Here are a few notable case studies:

  1. Case Study 1: In this case, a fleet of commercial vehicles experienced repeated instances of fault code SPN 5585/FMI 18. The issue was traced back to a faulty exhaust gas temperature (EGT) sensor. After replacing the sensor, the fault code no longer appeared, and the vehicles returned to optimal performance.
  2. Case Study 2: A construction company encountered frequent occurrences of fault code SPN 5585/FMI 18 on their equipment. After thorough investigation, it was discovered that a clogged diesel particulate filter (DPF) was causing the issue. Cleaning the DPF and performing regular maintenance solved the problem and prevented further occurrences.
  3. Case Study 3: A generator set at a remote site exhibited persistent fault code SPN 5585/FMI 18, leading to power disruptions. The root cause was identified as a damaged wiring harness. Replacing the damaged harness and ensuring proper insulation resolved the fault code issue and restored uninterrupted power supply.

Lessons Learned From Successful Resolutions

Successful resolutions of SPN 5585/FMI 18 provide valuable lessons that can guide troubleshooting efforts. Here are some key takeaways:

  • Thorough diagnosis: It is crucial to conduct a comprehensive diagnosis to identify the exact cause of the fault code. This includes examining components such as sensors, filters, and wiring harnesses.
  • Maintenance practices: Regular maintenance, such as cleaning filters and inspecting wiring, is essential in preventing fault code occurrences. Adhering to recommended maintenance schedules can help minimize troubleshooting efforts.
  • Component quality: The quality of components used in the system can significantly impact fault code occurrence. Using genuine parts and ensuring proper installation can enhance system reliability.

Challenges Faced During Troubleshooting

Troubleshooting SPN 5585/FMI 18 can present certain challenges that technicians need to overcome. Some common challenges include:

  1. Faulty sensor readings: Fault code occurrences may be triggered by inaccurate sensor readings. Technicians need to verify sensor data to ensure accurate diagnosis and troubleshooting.
  2. Accessibility issues: Depending on the location of components related to the fault code, accessing and inspecting them could be challenging. This may require specialized tools or equipment.
  3. Intermittent faults: SPN 5585/FMI 18 fault codes can sometimes occur intermittently, making it harder to pinpoint the root cause. Thorough data analysis and monitoring can help identify patterns and facilitate troubleshooting.

By studying these case studies and understanding the lessons learned from successful resolutions and challenges faced during troubleshooting, we can improve our approach to resolving fault code SPN 5585/FMI 18.

Cummins Fault Code Spn 5585 Fmi 18  : Troubleshooting Tips


Frequently Asked Questions For Cummins Fault Code Spn 5585 Fmi 18

What Is The Meaning Of Cummins Fault Code Spn 5585 Fmi 18?

The Cummins Fault Code SPN 5585 FMI 18 indicates a fault related to the Aftertreatment 1 Diesel Exhaust Fluid Dosing Unit. It could be triggered by issues such as low DEF quality or a malfunctioning dosing unit.

How To Diagnose Cummins Fault Code Spn 5585 Fmi 18?

To diagnose Cummins Fault Code SPN 5585 FMI 18, use diagnostic software to check for other fault codes, perform a dosing unit test, and inspect the DEF dosing system for leaks or blockages. Also, verify the DEF quality and the dosing unit’s electrical connections.

What Are The Potential Causes Of Cummins Fault Code Spn 5585 Fmi 18?

The potential causes of Cummins Fault Code SPN 5585 FMI 18 include DEF quality issues, a malfunctioning dosing unit, clogged DEF lines, faulty temperature sensors, or electrical system problems.

How To Resolve Cummins Fault Code Spn 5585 Fmi 18?

To resolve Cummins Fault Code SPN 5585 FMI 18, check and refill DEF, clear active fault codes, replace or repair faulty dosing unit components, and ensure proper system priming. Address any electrical or mechanical issues affecting the dosing unit.


Understanding Cummins fault code SPN 5585 FMI 18 is essential for troubleshooting and resolving issues with your Cummins engine. By decoding the fault code, identifying the specific problem, and taking appropriate actions, you can ensure optimal performance and prevent further damage.

Remember to consult the Cummins diagnostic manual and seek professional assistance when needed for accurate diagnosis and effective solutions. Stay informed and proactive to keep your engine running smoothly.