What is SPN 168 FMI 14 & How to Solve It?

What is SPN 168 FMI 14:

SPN 168 FMI 14 indicates a fault with the Engine Coolant Temperature Sensor Circuit - Electrical Malfunction. This means the engine control module (ECM) has detected an electrical issue or communication failure in the coolant temperature sensor circuit, which can lead to inaccurate engine temperature readings and impact engine performance and emissions.

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Why This Happens

Common causes include:

• Faulty or damaged coolant temperature sensor.
  
• Wiring issues such as shorts, open circuits, or corroded connectors.
  
• Faulty ECM or sensor calibration errors.
  
• Poor electrical connections or damaged wiring harness.
  
  

How to Fix It

To resolve this fault:

1. Inspect the coolant temperature sensor and wiring for damage or corrosion.
   
2. Test the sensor’s electrical signals and replace if faulty.
   
3. Repair or replace damaged wiring or connectors.
   
4. Clear the fault code and monitor engine temperature readings.

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How to Avoid It Before It Happens

Prevent this fault by:

• Regularly inspecting the coolant temperature sensor and wiring.
  
• Keeping electrical connections clean and secure.
  
• Performing routine diagnostics to detect electrical issues early.
• Use Clue’s Preventive Maintenance to regularly inspect the coolant temperature sensor, wiring, and electrical connections to prevent issues before they impact engine performance.