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P0446 Diagnostic Trouble Code Discussion for March 2019

EVAP Vent System Performance

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Trouble Ticket Help Requests for DTC P0446
Help Request Posted
2007 Chevrolet Suburban 1500 Z71 5.3L MIL Lamp on VIN: 3GNFK16347
P0446: EVAP Vent System Performance. ... on (p0446), i test the vent and purge valve test out good. Smoke test the evap hoses no leaks were found, how ever after getting more information, customer stated that is hard to refuel. We remove the gas tank to inspect the fuel pressure sensor and h...
March 29, 2019