What is SPN 802:
SPN 802 refers to a fault in the Coolant Temperature Sensor. This sensor monitors the temperature of the engine coolant to ensure it is within the proper range for efficient engine performance. A malfunctioning sensor can lead to incorrect coolant temperature readings, which could affect fuel efficiency, engine performance, and emissions control.
Why This Happens
- Faulty or degraded coolant temperature sensor.
- Shorted or damaged wiring in the sensor circuit.
- Corroded or loose sensor connectors.
- Malfunctioning Engine Control Module (ECM) misinterpreting data.
- Low coolant levels or air in the cooling system.
How to Fix It
- Inspect the coolant temperature sensor and wiring for visible damage or corrosion.
- Test the sensor for accurate voltage and resistance readings.
- Check the sensor connector for tightness and moisture.
- Replace the coolant temperature sensor if the readings are out of spec.
- Verify coolant levels and bleed air from the cooling system if necessary.
How to Avoid It Before It Happens
- Regularly check coolant levels and replace the coolant as needed.
- Inspect the coolant temperature sensor during routine maintenance.
- Keep connectors clean, dry, and properly sealed.
- Replace the sensor at the recommended intervals.
Use Clue's equipment tracking to monitor engine parameters like coolant temperature in real-time and catch issues before they impact engine performance.