What is SPN 1239 FMI 16
- SPN 1239: Refers to a fault related to the air conditioning (A/C) refrigerant pressure sensor, indicating that the refrigerant pressure is too high or too low.
- FMI 16: Indicates that the sensor is providing an incorrect signal or data to the ECM, which means the ECM is unable to get accurate refrigerant pressure information.
Together, SPN 1239 FMI 16 signals a fault in the A/C system’s refrigerant pressure sensor, which could lead to improper air conditioning performance.
Why It Happened
This fault code is typically caused by:
- A malfunctioning or faulty refrigerant pressure sensor.
- Wiring issues between the sensor and ECM.
- Low or high refrigerant levels affecting the sensor's readings.
- A failing compressor or blockage in the A/C system affecting pressure.
How to Resolve It
To resolve SPN 1239 FMI 16:
- Inspect the refrigerant pressure sensor for faults and replace if necessary.
- Check the refrigerant levels and ensure they are within the proper range.
- Inspect the A/C system for blockages or malfunctioning components.
- After repairs, clear the fault code and restart the engine to verify the fix.
How to Avoid Before It Happens
To prevent SPN 1239 FMI 16:
- Regularly check refrigerant levels and inspect the A/C system.
- Ensure the refrigerant pressure sensor and wiring are functioning properly.
- Use Clue to monitor A/C system data and receive early alerts on pressure issues.
