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    igottogonow's Avatar
    igottogonow Posts: 128, Reputation: 2
    Junior Member

    May 18, 2007, 05:30 AM
    2002 Jeep Grd Cherokee 4.0 liter engine code.
    I have a 2002 Jeep Grd Cherokee 4.0 liter. I keep getting codes: PO442 Evaporative Emission Control Leak Detected (Small Leak) & PO455 same as above but Gross Leak. Dealer keeps telling me it's a bad gas cap but after the third one I think I need to go to a different dealer. Does anyone know what this code means?
    CaptainRich's Avatar
    CaptainRich Posts: 4,492, Reputation: 537
    Cars & Trucks Expert

    May 18, 2007, 05:41 AM
    Is the cap you're using factory or aftermarket? Tiny differences can make cheaper caps not fit right. Also check where the cap seats for anything that could prevent a good seal. They've told you the codes that are setting but have they diagnosed the car? The leak could be at charcoal canister or the lines going to/from it... Good luck!

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