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P0446

P0446 is an evaporative emission (EVAP) code. The three GM bulletins that list it do not print its description, but each traces it to the canister’s vent side: the canister vent solenoid, the fresh-air path that feeds it, or the canister filter pipe.

1 guide · GM bulletin references

EVAP vent system

GM bulletin guides

1 relevant guide

  1. Chevy P0446: GM EVAP Vent Fixes for Silverado, Tahoe, Cruze

    P0446 on a Chevy: GM bulletins tie it to dust in Silverado and Sierra canisters, water at the 2007–2010 Tahoe vent valve, and the Cruze 1.4L filter pipe.