What is MID 18 & How to Solve It?

What is MID 18:

MID 18 refers to a problem with the Engine Coolant Temperature Sensor Circuit. The ECM detects that the sensor is out of range, which can lead to engine overheating or improper engine operation if not addressed.

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Why This Happens:

• Faulty engine coolant temperature sensor.
  
• Shorted or damaged wiring in the sensor circuit.
  
• Loose or corroded sensor connectors.
  
• Low coolant levels affecting sensor functionality.
  
• ECM misinterpretation of the sensor’s data.
  
  

How to Fix It:

1. Inspect the engine coolant temperature sensor for visible damage or malfunction.
   
2. Test the sensor’s voltage and resistance to ensure it is working within specifications.
   
3. Check wiring and connectors for visible damage or corrosion.
   
4. Replace the faulty sensor if necessary.
   
5. Ensure the coolant system is properly functioning and coolant levels are maintained.
   
   

How to Avoid It Before It Happens:

• Regularly inspect the coolant temperature sensor and wiring.
  
• Keep connectors clean and free from corrosion.
  
• Maintain proper coolant levels and perform regular coolant system maintenance.
  
• Perform routine diagnostic checks to ensure sensor accuracy.
  
• Clue’s Equipment Maintenance services track coolant systems and sensors to prevent overheating and engine mismanagement before it affects performance.