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  1. #1
    Jr. Engineer
    Join Date
    Mar 2010
    Cochrane, AB

    Default P0442 Evaporative Emission Leak Detected

    Just got a new code reader (one I would highly recommend if anyone is looking for a cheap one) and I got this P0442 Code: Evaporative Emission System Leak (Small Leak).

    Anyway, in my mind it seems negligible and I cleared the code to see if the light comes on again, but just thought I'd check if anyone knows what causes this problem/what I could possibly do to remedy it? Or if I even need to fix it?

    Thanks very much in advance!

    2004 Silverado LS 5.3L Z71 Crew Cab
    260,000+ km

  2. #2


    the evap leaks are a pain to track down. after having my fuel pump replaced they left one of the hoses off the evap canister and was getting a major leak. once that was fixed I started getting the small leak code after like every few weeks. didnt do anything about the small leak and eventually it stopped giving me the code . Not sure thats really a fix though. small and even large leaks are hard to find. start with gas cap then check hoses going to and from evap canister for cuts etc. Some shops can smoke test the system to find the leak. but its difficult to track down especially the small leaks.
    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
    Jr. Engineer
    Join Date
    Mar 2010
    Cochrane, AB


    Thanks for the info. Good to know! I'm not overly concerned, more just curious than anything else. I'll begin to search for it if the light comes on again

  4. #4
    Jr. Apprentice david12601's Avatar
    Join Date
    Sep 2010
    poughkeepsie new york


    I had the same code after hours of troubleshooting I found a pinhole had rusted through the fuel filler about 2 inches down from the top. T took JB weld and a little dab and it was fixed

  5. #5

    Enkeiavalanche's Avatar
    Join Date
    Apr 2010
    Piermont,NY, back in Northern NJ now, But may be in IL soon....


    I had the code a few weeks ago First it said loose Gas cap So the dealer got me a new one.. A week later it was back ended up being a Vent above the gas tank.. They replaced that and all good.. They said it happens all the time. It gets stuck open..
    08 Z71 Avalanche Mods to date: K&N CAI,Hellwig Swaybars and End Links, Corsa Sport Exhaust, Superchips Programer,IPCW LOF & 3rd brake light and tails, AMI Gas door,Show Hooks and Door locks, Enkei Wheels, with Pirelli tires, StreetScene Bowties, Grant Steering wheel,Muth signal mirrors,SSBC Big Brake kit,Huskyliner Mug gards,Floor mats and Hood shield, McGard Lug nuts and locks, Bedrug, Cervini's Ram Air hood,35watt HID Fog lights, Sylvania bulbs all around ZXE's Highs and Lows, WhiteNight Back up lights,Sirius and HD Radio, SnugTop sitting on deck now Got a Softopper on now,Tempress Boat Hatches.... New Bilstein shocks are on... New Mods coming soon..... X

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