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The code can also be set if the wiring to the valve is damaged between the ECM and the purge valve causing an open circuit if the wire is cut or a short if the wire is shorted to ground or a power source. The cause of code P0443 can be a purge control valve internal open circuit or the connector is corroded causing loss of contact with the valve. The ECM has commanded the purge control valve to open and detected either an incomplete open circuit or a short in the circuit. This could mean an open or short in the valve or circuit. P0443 is an OBD-II generic code that the engine control module (ECM) has detected a malfunction with the purge control valve or its control circuit. Evaporative Emission Control System Purge Control Valve Circuit Malfunction What the P0443 code means
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