P0449 Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction

Possible causes – Purge Control Valve harness is open or shorted– Purge Control Valve electrical circuit poor connection– Faulty canister vent control valve When is the code detected? The Engine Control Module (ECM) has determined that a malfunction exists in

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P0449 2006 GMC SIERRA Evaporative Emission Vent Valve Solenoid Malfunction

Possible causes – Vacuum leaks, damaged hoses or improper routing– EVAP system – Check fuel cap, canister, valves or components– Faulty purge or vent solenoids– Check connector and wiring– Fuel saturated vapor canister– Failed EVAP vent solenoid Tech notes Check

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