Fuel Shutoff Valve "B" Control Circuit Low

Possible causes

• CommonFailed fuel shutoff valve solenoid
• CommonCorroded connector or damaged wiring
• CommonBlown fuse or failed relay
• PossibleValve sticking mechanically
• RareFailed control module driver

What you might notice

• Engine will not start on one fuel
• Engine will not switch between fuels
• Engine cutting out when switching fuel
• Fuel gauge for one tank not working
• Check engine light on

What to check, in order

1. Disconnect the valve and check whether the low reading persists at the harness.
2. Check the fuse and relay for the circuit before anything else.
3. Check for battery voltage at the valve when it should be open.
4. Measure the valve winding resistance against specification.
5. Inspect the connector for corrosion - many of these valves are mounted underneath.
6. On a bi-fuel vehicle, check whether the engine runs correctly on the other fuel. That single test separates a valve fault from a general fuel system problem.