What is FMI 12 & How to Solve It?

What is FMI 12

FMI 12: Refers to a fault in the sensor circuit where the data signal is invalid or not recognized by the ECM. This code typically indicates an issue with the sensor’s electrical circuit or an internal failure.

FMI 12 signals that the ECM is unable to process the sensor data correctly, potentially due to a broken or malfunctioning sensor circuit.

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Why It Happened

This fault code is commonly caused by:

• Damaged wiring or connectors between the sensor and ECM.
  
• A malfunctioning sensor that is providing faulty or no data.
  
• An issue with the sensor's power supply.
  
• A software issue or failure in the ECM processing the sensor signal.

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How to Resolve It

To resolve FMI 12:

1. Inspect the sensor wiring and connectors for damage or loose connections.
   
2. Replace the faulty sensor if necessary.
   
3. Test the ECM for potential processing errors.
   
4. After repairs, clear the fault code and restart the system to confirm the fix.
   
   

How to Avoid Before It Happens

To prevent FMI 12:

• Regularly inspect sensor wiring and connections for wear or damage.
• Perform routine maintenance on the sensor to ensure it’s functioning properly.