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The car is pulling obd code p0455 and p0455pd

(2004 Pontiac GTO)
in Westwood, NJ on September 14, 2011
This only happens when the I drive the car, park it for 5mins jump back in and start it up. I have replaced the gas cap and its still pulling the codes
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Popular Answer
on September 14, 2011
this obd2 trouble code table can help you understand the meaning of code,
http://www.chinasinoy.com/service/how-to-understand-trouble-codes-37.html
and for this code, I think you can try this,
Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back.
Otherwise, replace the gas cap, and/or
Inspect the EVAP system for cuts/holes in tubes/hoses (you may hear a vacuum noise or smell fuel), repair if necessary
on September 14, 2011
P0455 EVAP LARGE LEAK DETECTED, eVAP SYSTEM IS UNABLE TO ACHIEVE VACCUM DURING DIAGNOSTIC MODE. You might want to take it to a shop for them to perfom Evap performance test.
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