P0449 Code - Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction

What Does P0449 Mean?

The Evaporative Emission System (EVAP) canister vent control valve is located on the EVAP canister and is used to seal the canister vent. This solenoid (the EVAP canister vent control valve) responds to signals from the Engine Control Module (ECM). When the ECM sends an ON signal, the coil in the solenoid valve is energized. A plunger will then move to seal the canister vent. The ability to seal the vent is necessary for the on board diagnosis of other evaporative emission control system components. This solenoid valve is used only for diagnosis, and usually remains opened. When the vent is closed, under normal purge conditions, the evaporative emission control system is depressurized and allows EVAP Control System (Small Leak) diagnosis.

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What are the common causes of P0449 ?

• A plugged converter will cause of host of driveability problems as well as set this code. A severely plugged converter will result in the inability to increase rpm when under load. Look for a code such as P0421 -- catalytic converter efficiency below threshold if the converter indicating a faulty converter.
• Dirty air cleaner element Damaged DPF
• An air leak forward of the DPF will change the sensor readings resulting in the code

How do you troubleshoot P0449 ?

• Repairing or replacing the wiring harness
• Replacing the charcoal canister vent valve
• Repairing faulty electrical connections
• Replacing faulty ECU

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