What it means
The controller cannot drive the secondary fuel shutoff valve. Engine cannot be commanded off through this path during a safety event.
At a glance
- Usually lights the check-engine light
How it works
Fuel shutoff valve B is an electrically controlled valve intended to stop fuel flow when the system commands it. This code sets when the controller detects an open in the valve's control circuit, so it may be unable to operate this shutoff path when needed.
Common causes
Most likely first.
- Open coil in shutoff valve
- Broken control wire
Symptoms
- Check-engine light
How to diagnose it
- Record freeze-frame data and check for related fuel-shutoff or circuit codes before clearing them.
- Identify fuel shutoff valve B from vehicle service information and inspect its connector and harness for a break, loose pin, or corrosion.
- With the valve disconnected as directed by service information, check its coil for an open circuit against the manufacturer's specification.
- Check continuity of the valve B control wire and inspect its routing for damage or a disconnected terminal.
- If the valve and wiring pass, test the controller connector and output using the manufacturer's diagnostic procedure.
Common fixes
- Reconnect or clean the valve B connector and repair damaged terminals.
- Replace fuel shutoff valve B if its coil is open.
- Repair a broken control wire or open connector terminal.
- Repair a confirmed controller connection or driver fault.
Can I keep driving?
The engine may run normally, but the affected shutoff path might not stop fuel flow when called on in a safety event. Arrange prompt diagnosis and avoid operating the vehicle if there is a fuel leak or fuel-system warning.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.