What is SPN 5396 FMI 1
- SPN 5396: Refers to a fault related to the exhaust gas temperature sensor, indicating that the exhaust gas temperature is too high or too low.
- FMI 1: Indicates that the sensor has provided an out-of-range signal, meaning the ECM is receiving inaccurate or faulty temperature data from the sensor.
Together, SPN 5396 FMI 1 signals a problem with the exhaust gas temperature sensor, which could affect engine performance and emissions control.
Why It Happened
This fault code is usually caused by:
- A malfunctioning or failed exhaust gas temperature sensor.
- Loose or damaged wiring between the sensor and ECM.
- Extreme temperatures affecting the sensor’s readings.
- Contamination or corrosion in the sensor or connectors.
- A failure in the ECM processing the sensor’s data.
How to Resolve It
To resolve SPN 5396 FMI 1:
- Inspect the exhaust gas temperature sensor for damage or wear.
- Check the wiring and connections for signs of corrosion, damage, or loose connections.
- Replace the faulty sensor if needed.
- After repairs, clear the fault code and restart the engine to verify the fix.
How to Avoid Before It Happens
To prevent SPN 5396 FMI 1:
- Regularly inspect the exhaust system and sensors.
- Keep the exhaust system clean and free from contamination.
- Use Clue to monitor exhaust gas temperature data and get early alerts for potential issues.
