2005 grand prix reads a code 0446 and it stalls while idling

Asked by GuruK6H9T Dec 16, 2019 at 08:42 PM about the 2005 Pontiac Grand Prix

Question type: Maintenance & Repair

evap code 0446 comes up so we replaced the evap sensor ...any suggestions?

2 Answers


Inspect the vent hoses for a restriction. This code is telling us there's a restriction in the vent portion of the EVAP system. Once you make the repair clear the computer. The EVAP readiness monitor is the hardest on to get to see. Consequently the check engine light may remain on a very long time. The computer must run the diagnostics on the system for the light to go out after the repair. With the EVAP system that could take a while! Hope that helps! Jim


*Hardest one to get to set! Sorry! Jim

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