The P1440 code indicates that the engine control module has detected the EVAP purge valve is stuck in the open position. This prevents the system from properly regulating the flow of fuel vapors from the charcoal canister into the intake manifold.
The internal seal of the solenoid has failed or the valve is mechanically stuck open.
Debris or carbon deposits are preventing the valve from seating and closing completely.
Cracks or leaks in the vacuum hoses connected to the purge valve can simulate a stuck-open condition.
Shorts or open circuits in the wiring harness leading to the purge valve solenoid.
Internal failure of the control module's driver circuit for the purge solenoid.
It is unlikely to cause a complete stall, but it can cause unstable idling or difficulty starting after the fuel tank is filled.
The vehicle is typically drivable, but it will fail emissions testing and may cause slightly poor fuel efficiency.
No; P1440 is almost always caused by a mechanical failure of the purge valve itself. Replacing the PCM is rarely the correct fix for this specific fault.