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P0455 is Evaporative Emission System Purge Conlrol Valve Circuit Shorted. In otherwords the wires going to the Purge Control Valve may be fried.Or mabe the valve needs to be replaced.Good Luck and have a dood XMASS.
A code 455 most likely one or more of the following has happened a loose or bad gas cap a non-conforming gas cap other leaks or damage pieces in the evap system
Inspect the evap system for cracks or breaks in lines listen for vacume leaks or strong gas fume smell and fix all lines you find that are damaged ..I know you say you put a new gas cap but make sure it a conforming cap..Hope this helps