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P0446 Diagnostic Trouble Code Discussion for January 2009

EVAP Vent System Performance

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Trouble Ticket Help Requests for DTC P0446
Help Request Posted
2004 GMC Yukon Denali 6.0L MIL Lamp on VIN: 1GKFK66404
P0446: EVAP Vent System Performance. This truck has been in our shop many times for this problem. They lived on a dusty road so i did the service bulliten on it. It has freeze frame data that shows tank press. at 3.5 volts but when I check it it always is with in .2 volt of 1.5v. purge and vent w...
January 09, 2009
2006 Hummer H2 6.0L MIL Lamp on VIN: 5GRGN23UX6
P0446: EVAP Vent System Performance. ... and code P0446 (EVAP vent control problem). Checked the operation of the purge and vent valves, both clicked when commanded on. Smoke tested the entire EVAP/fuel tank and found no leaks. When the vent valve was commanded on and off it would completely shut...
January 21, 2009