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2002 GMC Envoy Question: engine code p440 will not turn off

 

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25centcdn, Ojibwa, WI, October 12, 2013, 15:23
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engine light on , fogged from both ends, charcoal cannister replaced celenoids cleaned and still p440

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  • Answer #1

    G. T. Service Center (3086 Answers) , Stephenville, TX - (254) 638-3236
    ProfessorG October 12, 2013, 15:35
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     Master

    Run evap test; Check for change in fuel tank pressure sensor. If no change and no leaks, possible bad sensor in fuel pump module.

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