P0446 Explained - EVAP Emission Control System Vent Control Circuit Malfunction (Simple Fix)

The FIXD wireless OBD2 scanner and free app for iPhone and Android translates your check engine light into plain English so you can rest easy. In this video, we explain what OBD2 code P0446 means and possible causes.
P0446 means there is an evaporative emission control system vent control circuit malfunction.
The evaporative emission control (EVAP) system prevents fuel vapors from escaping into the atmosphere. The fuel vapors from the fuel tank are absorbed and stored by charcoal pellets in the charcoal canister. The vent control valve is controlled by the engine control module (ECM) and allows air to flow into the charcoal canister to purge the gas vapors into the engine air intake to be burned. The flow of the gas vapors from the charcoal canister to the engine air intake is controlled by a purge valve. Both the vent control valve and the purge valve are usually open when the engine is at normal operating temperature.
However, the ECM occasionally performs leak tests to ensure the evaporative emission control system is working properly. During the leak test, the ECM closes the vent control valve and purge valve to create a vacuum.
When P0446 is triggered, the ECM has detected a short in the circuitry to activate the vent control valve, or the EVAP system failed to maintain the vacuum during the active EVAP leak test.

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0:00​ P0446 - Evaporative Emission Control (EVAP) System Vent Control Circuit Malfunction
0:24​ What is the EVAP System?
1:00​ P0446 is Caused When There is a Small Leak or Short Circuit in the EVAP System
1:13​ Possible P0446 Causes When Paired with P0440 or P0441
1:42 Possible P0446 Cause - Gas Cap
1:44 Possible Simple Fix for P0446 - Inspect Gas Cap
2:40 Possible P0446 Cause - EVAP Hoses
2:50 Possible P0446 Cause - Fuel Tank and Charcoal Canister
2:58 Possible P0446 Cause - Vent Control Valve
3:10 Visit our blog to learn more about P0446
3:34 Happy Driving!

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