What does Engine code P0004 mean?
What does Engine code P0004 mean? P0004 is a generic OBD-II code indicating an issue with the engine control module (ECM) not reading signals from your fuel shut-off on your fuel injection rail mounted to your engine. The ECM uses the fuel shut-off valve to stop fuel from entering the engine when you turn it off. What does the error code p0001 mean on a fuel pump? Error Code P0001 is described as Fuel Volume Regulator Control Circuit/Open, and is linked to issues with the electrical circuit connected to the fuel pressure regulator. Error Code P0001 shows up when there’s...