What is SPN 3359
- SPN 3359: Refers to a fault in the air conditioning (A/C) refrigerant pressure sensor, which monitors the pressure of refrigerant in the A/C system. If the refrigerant pressure is not within the normal operating range, it could affect the A/C performance.
When SPN 3359 is triggered, it suggests that the ECM is receiving abnormal refrigerant pressure readings, possibly due to a malfunctioning sensor or issues within the A/C system.
Why It Happened
This fault is commonly caused by:
- A malfunctioning refrigerant pressure sensor.
- Incorrect refrigerant levels in the A/C system (either too high or too low).
- Leaks in the A/C system that lead to pressure changes.
- Wiring issues or poor connections between the sensor and ECM.
- A failing compressor or blockage in the refrigerant lines that disrupts pressure readings.
How to Resolve It
To resolve SPN 3359:
- Inspect the refrigerant pressure sensor: Check the sensor for any faults or damage, and replace it if necessary.
- Check refrigerant levels: Ensure that the refrigerant is at the correct level and charge it as needed.
- Inspect the A/C system: Look for leaks or blockages in the refrigerant lines.
- Check wiring and connections: Inspect the wiring between the sensor and ECM for any issues.
- Clear the fault code: After repairs, clear the fault code and restart the engine to verify the fix.
How to Avoid Before It Happens
To prevent SPN 3359:
- Regularly inspect the A/C system, including the refrigerant pressure sensor.
- Ensure proper refrigerant levels and check for any system leaks.
