Code po446 what is it

Its what is called the EVAP. system the code is for the vent solenoid .Gas vapor in a vacuum is drawn from the fuel tank when this vent is commanded to be open drawn into a canister filled charcoal and stored until the canister purge solenoid is commanded to open .
This happens when the engine speed is at a higher RPM level and is supposed to send the vapor to the engine to be burned instead of VOC'S going into the atmosphere .But its a crazy lie the last time I filled up more VOCS got into the atmosphere then a gas tank vent could do in 6 month or so .
You can try cleaning the filter in the vent solenoid it might work but the part is about 70 dollars its in the rear between the tank and the canister look for hoses .

Code p 0446 refers to evaporative emission (EVAP) system, vent control---circuit malfunction===== causes --wiring---EVAP canister purge valve ---ECM
check the wiring connections for corrosion , loose
replace the purge valve

P0446 DescriptionThe 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.Read more: http://www.engine-codes.com/p0446.html#ixzz4BylnvUND