What is SPN 2659 & How to Solve It?

What is SPN 2659:

SPN 2659 indicates an issue with the Exhaust Gas Temperature Sensor. This fault suggests that the ECM is receiving an incorrect or out-of-range signal from the sensor, which can lead to inaccurate exhaust temperature readings and affect the exhaust after-treatment system.

‍

Why This Happens:

• Faulty exhaust gas temperature sensor.
  
• Damaged or shorted wiring in the sensor circuit.
  
• Loose or corroded sensor connectors.
  
• Blockage or contamination in the exhaust system.
  
• ECM misinterpretation of the sensor signal.
  
  

How to Fix It:

1. Inspect the exhaust gas temperature sensor for damage or malfunction.
   
2. Test the sensor’s signal to ensure it is within manufacturer specifications.
   
3. Check wiring and connectors for damage, corrosion, or loose connections.
   
4. Replace the faulty sensor if necessary.
   
5. Inspect the exhaust system for blockages or contamination.
   
   

How to Avoid It Before It Happens:

• Regularly inspect the exhaust gas temperature sensor and wiring.
  
• Keep connectors clean and free from corrosion.
  
• Maintain the exhaust system to ensure it is free from blockages.
  
• Perform routine diagnostic checks on sensor performance.
  
• Clue’s Equipment Maintenance services track EGT system health and prevent issues before they affect engine performance.