P2665

Fuel Shutoff Valve "B" Control Circuit/Open

Severity: High
Driving: Drive only to a garage

An open circuit in the fuel shutoff valve "B" control. On a bi-fuel or alternative-fuel vehicle these valves select which fuel supply is open; on a diesel a shutoff valve is what stops the engine. With the circuit open the valve cannot be operated.

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

Check the fuse and relay for the circuit before anything else.
Check for battery voltage at the valve when it should be open.
Measure the valve winding resistance against specification.
Inspect the connector for corrosion - many of these valves are mounted underneath.
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.

Read this code from your own car

Plug an ELM327 adapter into the OBD-II port under the dashboard. Pin16 reads every stored, pending and permanent code, explains each one like this page does — offline, with no account — and shows what the car recorded when the fault was set.

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Possible causes

What you might notice

What to check, in order

Read this code from your own car

Where this code sits