2000 Pontiac Grand Am p0440 code

2000 PONTIAC GRAND AM
100,000 MILES • 6 CYL • FWD • AUTOMATIC
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GRANDAMDUDE
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checked the computer and it is coming up with a p0440 and p0440 pending code with the cat flashing on the scanner. do you know what could be causing this problem?

Thank you
Oct 25, 2008 at 7:57 PM
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DLOBI
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Sounds like you have a leak somewhere in the evaporative system. The first and most common reason this code comes up is a loose or missing gas cap. Check that first. A mechanic can do a smoke test to find the leak if it isn't as easy as the gas cap.
Oct 28, 2008 at 12:38 PM
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GRANDAMDUDE
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Previously had the car smoked and they found that the vent valve was leaking that was new at the time to. Previously had a p0440 and p0442 code. Changed the valve and gas cap but still have a p0440 code. Thank you for the reply.
Oct 29, 2008 at 12:27 PM
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