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P0446 Diagnostic Trouble Code Discussion for March 2013

EVAP Vent System Performance

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Trouble Ticket Help Requests for DTC P0446
Help Request Posted
2008 GMC Sierra 2500 HD SLE 6.0L Fuel tank won't fill
P0446: EVAP control vent circuit. This truck takes FOREVER to fill up. I have to have the fuel nozzle right out of the filler neck and only squeaze the pump slightly to get anywere when filling. I have tried another pump with the same results. I work at the local road maintenance shop and this...
March 27, 2013