I have received the P0455 error code and it isn't the gas cap. What else can it be and how can I diagnose the problem?
Apr 22, 2010 at 1:34 AM
2004 Chevy Cavalier P0455 Evap System Leak Detected
LISALU44
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you need a scan tool and a smoke machine to really figure it out. but most likely its the vent valve. i would replace that and the gas cap.
Apr 22, 2010 at 7:39 AM
I recently had a Chevrolet Sunfire which is the same as the Cavalier with a gross leak detected P0455. I ran a smoke test and found that the leak was coming from the top of the fuel tank where the evap hose connects to the tank. I had to drop the tank and re-install the hose. Cleared the code and never did reset again.
Apr 22, 2010 at 7:42 AM
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