What is SPN 3031 & How to Solve It?

What is SPN 3031:

SPN 3031 refers to a fault in the Engine Fuel Shutoff Valve circuit. This valve is responsible for controlling the flow of fuel to the engine and is usually commanded by the ECM during key-on and key-off sequences. When this code appears, it means the ECM has detected an electrical issue—such as low voltage, open circuit, or incorrect feedback—from the shutoff valve circuit, potentially preventing the engine from starting or stopping properly.

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Why This Happens

• Faulty or stuck fuel shutoff valve.
  
• Damaged wiring or open circuit in the valve harness.
  
• Corroded or loose connectors.
  
• Blown fuse or failed relay in the valve circuit.
  
• ECM not receiving expected feedback from the valve.
  
  

How to Fix It

1. Inspect the fuel shutoff valve for sticking or mechanical failure.
   
2. Check wiring and connectors for corrosion, damage, or loose connections.
   
3. Test voltage and continuity at the valve connector.
   
4. Replace the fuel shutoff valve if it's faulty or non-responsive.
   
5. Clear the code and monitor engine start/stop behavior.
   
   

How to Avoid It Before It Happens

• Perform regular checks on all engine electrical connectors.
  
• Include valve circuit tests in routine maintenance diagnostics.
  
• Protect connectors from water and debris.
  
• Replace aging or weak fuel shutoff valves before failure.
  
• Address early signs like hard starts or engine not shutting off properly.
• Use Clue’s Preventive Maintenance to regularly check the engine’s fuel shutoff valve and its electrical connections to detect issues before they impact engine performance.