What is SPN 2919 FMI 9
- SPN 2919: Refers to a fault related to the diesel exhaust fluid (DEF) pressure sensor, indicating that the ECM is receiving incorrect or out-of-range data about the DEF system pressure.
- FMI 9: Indicates that the signal from the DEF pressure sensor is invalid or out of range, meaning the ECM cannot process the data accurately.
Together, SPN 2919 FMI 9 signals a malfunction in the DEF pressure sensor, which could affect the DEF system’s performance, leading to poor exhaust emissions control or incorrect DEF injection.
Why It Happened
This fault is typically caused by:
- A malfunctioning or faulty DEF pressure sensor.
- Wiring issues or poor connections between the sensor and ECM.
- Blockages or contamination in the DEF system affecting sensor readings.
- A failure in the ECM’s ability to process the data from the sensor.
How to Resolve It
To resolve SPN 2919 FMI 9:
- Inspect the DEF pressure sensor for faults or damage, and replace it if necessary.
- Check the wiring and connectors between the sensor and ECM for any damage or corrosion.
- Inspect the DEF system for blockages or contamination that could be affecting pressure readings.
- After repairs, clear the fault code and restart the engine to verify that the issue has been resolved.
How to Avoid Before It Happens
To prevent SPN 2919 FMI 9:
- Regularly inspect the DEF system and pressure sensor.
- Ensure that the DEF system is free from blockages or contamination.
- Use Clue to monitor DEF pressure data and receive real-time alerts for sensor or system issues.
