Unraveling the Mystery of the PO446 Code Evaporative Emissions Conundrum

I just got the P0446 EVAP MISSION CONTROL SYSTEM VENT CIRCUIT MALF error. From reading different posting here, it could be the VSV which I thought is the ... It deals with the evap system for the fuel tank. From what I read online, it's fine to drive with it, which I guess I'll have to because the dealer can't see ... P0446 is for a partially or fully plugged evap system. Stuck closed vent valve, pinched line, plugged vent valve, etc. A fix for the P0446 code is often related to replacing the vent valve solenoid. Two other common fixes for the P0446 code are blowing out the dust that is ... P0446 EVAP Vent Problem. Getting The Parts Store To Give You Codes Is Not Fixing The Issue.. 36K views · 2 years ago #automotiverepair ... DTC P0446 or P1450 indicates that Self-Test has detected the Evaporative Emission Control System has excessive fuel tank vacuum. It means you have a open or short in the vent cntrol valve that is allowing fuel vapor to be let into the air and not allowing the fuel system ... 1999 - 2016 Super Duty - Canister Vent Selonoid Testing PO446 - My 2011 F350 with the 6.2L gas engine has a CEL and code PO446. Let's have a look at this Chevrolet Cobalt that came with a code P0446 for the EVAP Vent Solenoid Performance. ... code is set when the computer (ECM/PCM) reads an issue with the vent valve, which is a part of the Evap system for emissions. The P0446 error ...