What it means
The control module monitors fuel shutoff valve B when it commands the valve to close. It sets this code when the valve is detected as remaining on or failing to close as expected.
At a glance
- Usually lights the check-engine light
How it works
Fuel shutoff valve B is intended to stop fuel flow through its path when the control module commands it closed. This code means valve B remains on or open when commanded off, so fuel may not be cut off through that path as expected.
Common causes
Most likely first.
- Valve seized open by debris
- ECU output driver stuck on
- Carbon or debris buildup preventing free movement
Symptoms
- Check-engine light
- Engine may continue running after shutdown
- Fuel may not shut off as expected
How to diagnose it
- Review freeze-frame data and related fuel-system codes, noting whether the engine continued running after shutdown.
- Inspect fuel shutoff valve B, its connector, and wiring for damage, corrosion, or signs of a short.
- Use a scan tool, if supported, to command valve B closed and check whether its status changes.
- Test valve B's control circuit for a short or persistent output using the manufacturer's procedure.
- If electrical power is removed as expected, check whether debris or a seized mechanism is holding valve B open.
Common fixes
- Repair a shorted wire or damaged connector at fuel shutoff valve B.
- Remove debris that prevents valve B from closing.
- Replace the valve B solenoid or valve if it remains mechanically open.
- Repair the control module output only if testing confirms its driver is stuck on.
Can I keep driving?
If the engine continues running after shutdown or fuel cannot be stopped as expected, park safely and seek prompt repair; do not continue driving with an unreliable fuel cutoff. An open valve may prevent fuel from being cut off when required.
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.