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P0446 Diagnostic Trouble Code Discussion for February 2015

EVAP Vent System Performance

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Trouble Ticket Help Requests for DTC P0446
Help Request Posted
2002 Pontiac Firebird Formula 5.7L MIL Lamp on VIN: 2G2FV22GS2
P0446: EVAP Vent System Performance. repaired 5 volt ref to ftp sen and now its seting a vent code of po446 .idroped the gas tank to check the vent valve .the vent valve is good the tank pressure is -11.2 vac. and volts 3.8 the tank is out of the car no vapor lines hooked up and still the same .n...
February 16, 2015