P2665 indicates that the control circuit for the fuel shutoff valve B has an open circuit, meaning the PCM is not receiving a proper signal from the valve's control circuit. This can prevent the valve from opening and allow fuel flow.
The valve itself may be internally open or shorted, breaking the control circuit and triggering the code.
A broken wire, chafed insulation, or loose terminal in the harness can interrupt the signal from the PCM.
Poor contact at the connector can create an open circuit even if the valve and wiring are otherwise sound.
If the circuit's fuse or relay fails, power to the valve control circuit is lost, resulting in an open condition.
A rare internal fault in the PCM's driver circuit can present as an open circuit, but this is typically the last suspect.
Usually not; the most common cause is a faulty valve or wiring issue, and PCM replacement is only considered after all other components have been verified.
Yes, a blown fuse or a tripped circuit breaker in the fuel shutoff valve B circuit will open the control circuit and set P2665.
Replacement time varies by vehicle model but generally requires 30 to 60 minutes for a qualified technician.
Driving may cause stalling, loss of power, or difficulty starting, so the issue should be addressed promptly to avoid unsafe operation.