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

Repair Importance Level: 1/3
Repair Difficulty Level: 3/3  What does this mean?
Possible causes
- Purge Control Valve harness is open or shorted
- Purge Control Valve electrical circuit poor connection
- Faulty canister vent control valve
  What does this mean?
When is the code detected?
The Engine Control Module (ECM) has determined that a malfunction exists in the electrical circuit for the vent valve/solenoid in the evaporative emission control system.
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P0449 Description

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.

P0449 Information for specific makes
P0449 AUDI EVAP System Vent Valve/Solenoid Circuit
P0449 BUICK Evaporative Emission Vent Valve Solenoid Malfunction
P0449 CADILLAC Evaporative Emission Vent Valve Solenoid Malfunction
P0449 CHEVROLET Evaporative Emission Vent Valve Solenoid Malfunction   
P0449 GMC Evaporative Emission Vent Valve Solenoid Malfunction   
P0449 HYUNDAI EVAP Emission System Vent Control Valve Solenoid Circuit
P0449 ISUZU Evaporative Emissions Vent Solenoid Control Circuit
P0449 KIA EVAP Emission System Vent Valve Solenoid Circuit
P0449 MERCEDES-BENZ Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction
P0449 PONTIAC Evaporative Emission Vent Valve Solenoid Malfunction
P0449 SATURN Evaporative Emission Control System Vent Solenoid Control
P0449 VOLKSWAGEN EVAP System Vent Valve/Solenoid Circuit
Related Information
Repair Importance Level: 1
 
1=Low 2=Medium 3=High  
Repair Difficulty Level: 3
 
1=Easy 2=Moderate 3=Hard  
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