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  1. #1

    Default p0442 and p0455 codes

    Hi all, did some searching for these codes and they all mention another code (p0499). I have not gotten that code, but am wondering if the codes I have are preemptive to that code. Its a 2006 Chevy Trailblazer 4.3L 6 cyl. I have already purchased a new gas cap and cleared the codes. Now they are back...any help would be appreciated.

  2. #2


    If you have checked/replaced the gas cap you need to look for a hole in the evap system. the p0455 is a large leak and the other is a small leak in the system. Its going to be in a hose or other part of the fuel evap system. Others may have specific fixes to these codes
    2004 Silverado 2500 Crew Cab 4x4, AMSOIL EA air filter, Granatelli MAF sensor, Throttle body spacer, Magnaflow exhaust (true dual to 2 in 1 out muffler), 6" ProComp lift (add a leaf and 5" superlift rear block), Bilstein shocks, 35's (Cooper Disoverer ST) and 4.10 gears, Rhino Liner, EGRUSA fender Flares and widow visors, extended stainless steel brake lines, firestone airbags w/onboard air compressor, Pioneer Avic X940BT navigation, Accel backup camera.
    1960 Land Rover Series II 88
    2001 Pontiac Sunfire
    2013 Toyota Avalon Limited (Wife's Car)
    NRA Life Member

  3. #3


    The quickest way to find the leak is with a smoke machine. Whatever you do don't blow air into the tank! Find a shop with a smoke machine and the leak will appear in no time. Other wise you will just being throwing parts at it. The leak may be in the back around the tank or anywhere in between the tank and the engine.

    2004 SILVERADO 2500HD LS
    Pro Comp Leveling Kit
    285-75-16 Cooper ST All Terrains
    Pro Comp Programmer
    Bilstein Shocks
    Linux Bed Liner
    Tinted Windows

    Other rides:

    1967 Landcruiser <350 Chevy>
    1970 Camaro
    1990 Geo Metro Convertible
    2007 FJ Cruiser

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