P0446 The Ultimate Guide to EVAP System Vent Control Circuit Diagnostics

How to fix a Toyota P0446 Code: Evaporative Emission Control System Vent Control Circuit Malfunction Possible Causes of a Toyota P0446 Code: ... It is most likely the valve in a line coming out of the gas tank. But they'd have to diagnose to know for sure, ie, supply power to the valve to see if it ... ... po446, pressure, sensor, tank · Subscribe. Related Topics. evap code p0446....?helpppp and opinions? throwing code p0446 · p0446 evap canister ... The code P0446 is set when the engine computer recognizes a fault or restriction at the vent control part of the Evaporative emission control system (EVAP). Corroded wire causing a check engine light with code P0446 and hard refueling. P0446 is a diagnostic trouble code (DTC) for "Evaporative Emission Control System Vent Control Circuit Malfunction". This can happen for multiple reasons. Techstream is the same diagnostic software that the dealer technicians use everyday, it doesn't get any better if you're serious about repair. It could be the canister vent valve sticking, it could be a line leaking or it could be the canister itself. The code - P0446: EVAP Emission System vent control circuit. This can get triggered due to a bad connection, faulty canister close valve. I keep getting code po 446 on my 2003 Silverado. I have read that it could be the vent control valve. Any ideas?