The car is pulling obd code p0455 and p0455pd on 2004 Pontiac GTO

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

by in Westwood, NJ on September 14, 2011
2 answers
ANSWER by 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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ANSWER by 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
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