What is SPN 190 & How to Solve It?

What is SPN 190

SPN 190: Refers to a fault related to the engine coolant temperature sensor, indicating that the coolant temperature is either too high or too low.

When SPN 190 is triggered, it indicates that the ECM is receiving abnormal temperature readings from the engine coolant temperature sensor, which can affect engine performance and cooling.

‍

Why It Happened

This fault code is usually caused by:

• Low coolant levels or coolant leaks.
  
• A malfunctioning engine coolant temperature sensor.
  
• A damaged thermostat that is not regulating coolant temperature properly.
  
• Loose or damaged wiring between the sensor and ECM.
  
• Contaminated coolant affecting the sensor's function.
  
  

How to Resolve It

To resolve SPN 190:

1. Check coolant levels and top off as needed.
   
2. Inspect the engine coolant temperature sensor for faults and replace it if necessary.
   
3. Test the thermostat to ensure it is functioning correctly.
   
4. Inspect wiring connections for damage or corrosion.
   
5. After repairs, clear the fault code and restart the engine to confirm the fix.
   
   

How to Avoid Before It Happens

To prevent SPN 190:

• Regularly check coolant levels and inspect for leaks.
  
• Perform routine maintenance on the thermostat and coolant temperature sensor.
  
• Use Clue to monitor engine temperature in real-time for early alerts.
• Use reports & analytics to spot trouble early.