P0446 Diagnostic Techniques Mastering the Art of Troubleshooting

Problems/Service/Repairs - PO446 Error Code - I know that this code is an emissions venting problem that can be associated with the gas cap, ... The P0446 means that the evap vent valve isn't responding properly, so either it's stuck open or stuck closed. Corroded wire causing a check engine light with code P0446 and hard refueling. I keep getting code PO466 Evaporative emission control system vent control circuit. It comes on for a couple days then goes off and then reappears again. This code can be triggered by an actual vent valve malfunction but can also be triggered by a leaky gas cap. By leaky, I mean the seal is ... Malibu - Error code PO446 - Hi, I have a 2001 Chevy Malibu with the error code PO446. It turns on the check engine light, but when I scan it ... Can anyone let me know if the severity level is an indicator of a specific part of the evap system. Why does it show ? Well-Known Member. Established Member. Joined: Mar 11, 2007. Messages: 7,580. Location: poteet,texas. po446 start HX65 2003 PCED OBD SECTION 5 ... If you drive in a dusty/dirty enviroment, the EVAP canister vent valve can become blocked with dirt and crud. ... and a new bracet for the valve, ... My vehicle: 2004 Suburban 2500 LT, 4x4, 8.1L engine, Whipple supercharger. Bought from original owner with 208000 miles.