What is SPN 807 FMI 8 & How to Solve It?

What is SPN 807 FMI 8

SPN 807: Refers to a fault related to the fuel pressure sensor.

FMI 8: Indicates that there is an abnormal or out-of-range voltage signal being sent from the sensor to the ECM.

Together, SPN 807 FMI 8 signals that the fuel pressure sensor is providing faulty data due to incorrect voltage, potentially leading to improper fuel regulation.

Why It Happened

This fault code is often caused by:

• A faulty fuel pressure sensor.
  
• Loose or damaged wiring connections between the sensor and ECM.
  
• Fuel system blockages affecting pressure readings.
  
• Voltage fluctuations or electrical issues affecting the sensor.
  
• A malfunctioning fuel pump that could cause abnormal pressure.
  
  

How to Resolve It

To resolve SPN 807 FMI 8:

1. Inspect the fuel pressure sensor for faults and replace if necessary.
   
2. Check the wiring and connectors for damage or corrosion.
   
3. Ensure that the fuel system is free from blockages or restrictions.
   
4. Test the fuel pump to ensure it is maintaining the correct pressure.
   
5. Clear the fault code and restart the engine to verify the fix.
   
   

How to Avoid Before It Happens

To prevent SPN 807 FMI 8:

• Regularly inspect the fuel system and replace filters as needed.
  
• Check fuel pressure sensor connections for wear and corrosion.
  
• Monitor fuel system performance in real-time using Clue.
• Use iOS & Android apps to address issues quickly.