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  1. #1

    Default Troubleshooting P0446 on 2002 Avalanche

    The Service Engine Light stays on continuously. Brought 2002 Avalanche to AutoZone to do troubleshooting, which came up as P0446.
    It showed the following:

    aaEVAP (evaporative emission system) purge/vent solenoid circuit condition
    The solenoids and system wiring are monitored for opens or shorts.
    Probable cause
    1. Purge or vent solenoids defective
    2. check connector and wiring
    3. Fuel saturated vapor canister
    4. Failed EVAP vent solenoid

    I'm not sure how to proceed with this. Is it safe to drive the truck? Can anyone help me understand this situation and how to check these possibilities?

  2. #2

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


    I had it on my 08 Avalanche for the past few weeeks.. Filled the tank hit a few bumps and it's now gone.. It's a BS Part above the tank that keeps vapor's from escaping.. NOT NEEDED...... Just something for the STEELERSHIP to charge you a arm and a leg to replace..
    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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