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P0446 code 2014 chevy silverado . Used chevrolet silverado 3500hd in phoenix, az. There is a bulletin for the. P0446 Chevrolet will this prevent me from refueling my 2011 silverado AutoCodes Q&A from www.autocodes.com Plugged vapor canister pinched or blocked evap hose faulty evaporative emission vent solenoid valve evaporative. | code p0446 chevrolet tech notes dirt and dust intrusion into the evap canister vent hose assembly, resulting in restricted air flow, may cause this condition. Evaporative emission control system vent control circuit malfunction;