engine code p440 will not turn off on 2002 GMC Envoy

engine light on , fogged from both ends, charcoal cannister replaced celenoids cleaned and still p440

by in Ojibwa, WI on October 12, 2013
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1 answer
ANSWER by , October 12, 2013
Run evap test; Check for change in fuel tank pressure sensor. If no change and no leaks, possible bad sensor in fuel pump module.