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P0446 - Evaporative Emission Control System Vent Control Circuit Malfunction

Possible causes
- Missing Fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- Vent control valve harness is open or shorted
- Vent control valve circuit poor electrical connection
- Faulty vent control valve
What does this mean? What does this mean?
When is the code detected?
The P0446 codes triggered when an improper voltage signal is sent to Engine Control Module (ECM) through EVAP canister vent control valve.
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Possible a noticeable fuel odor caused by the release of fuel vapors
P0446 Description

The Evaporative System (EVAP) canister vent control valve is located on the EVAP canister and is used to seal the canister vent.

This solenoid 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.

P0446 Information for specific makes
P0446 BUICK Evaporative Emission Vent System Performance
P0446 CADILLAC Evaporative Emission Vent System Performance
P0446 CHEVROLET Evaporative Emission Vent System Performance
P0446 CHRYSLER EVAP Purge Solenoid Stuck Open
P0446 DODGE EVAP Purge Solenoid Stuck Open
P0446 FORD EVAP System Vent Control Circuit
P0446 GMC Evaporative Emission Vent System Performance
P0446 HYUNDAI EVAP Emission System Vent Control Valve Open Circuit
P0446 INFINITI Evaporative System Canister Vent Control Valve Circuit
P0446 ISUZU Evaporative Emissions Vent System Performance
P0446 JEEP EVAP Purge Solenoid Stuck Open
P0446 KIA EVAP Emission System- Vent Control Valve Circuit
P0446 LEXUS EVAP System Vent Control Circuit
P0446 MAZDA Evaporative Emission Control System Vent Control Circuit Malfunction
P0446 MERCEDES-BENZ Evaporative Emission Control System Vent Control Circuit Malfunction
P0446 MITSUBISHI EVAP System Vent Control Valve Circuit
P0446 NISSAN Evaporative System Canister Vent Control Valve Circuit
P0446 PONTIAC Evaporative Emission Vent System Performance
P0446 SATURN Evaporative Emission Vent System Performance
P0446 SCION EVAP System Vent Control Circuit
P0446 TOYOTA EVAP System Vent Control Circuit  P0446 Video
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