What is SPN 802 & How to Solve It?

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.

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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

1. Inspect the coolant temperature sensor and wiring for visible damage or corrosion.
   
2. Test the sensor for accurate voltage and resistance readings.
   
3. Check the sensor connector for tightness and moisture.
   
4. Replace the coolant temperature sensor if the readings are out of spec.
   
5. 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.