What is SPN 3359 FMI 31
- SPN 3359: Refers to a fault related to the air conditioning (A/C) system, specifically the A/C refrigerant pressure sensor.
- FMI 31: Indicates that the sensor is failing to provide valid data, meaning the ECM is not receiving the correct refrigerant pressure readings.
Together, SPN 3359 FMI 31 signals a problem with the refrigerant pressure sensor, which could lead to malfunctioning air conditioning and improper cabin temperature regulation.
Why It Happened
This fault code is typically caused by:
- A malfunctioning or faulty refrigerant pressure sensor.
- Leaks in the A/C system affecting pressure readings.
- A failure in the ECM processing the sensor’s data.
- Wiring issues or poor connections between the sensor and ECM.
How to Resolve It
To resolve SPN 3359 FMI 31:
- Inspect the refrigerant pressure sensor and replace it if necessary.
- Check the A/C system for leaks or pressure issues.
- Inspect the wiring and connectors for damage or corrosion.
- After repairs, clear the fault code and restart the engine.
How to Avoid Before It Happens
To prevent SPN 3359 FMI 31:
- Regularly inspect the A/C system, including the refrigerant pressure sensor.
- Check for refrigerant leaks or pressure issues.
- Use Clue to monitor A/C system data and receive early alerts for sensor faults.
