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  1. #1
    Master Mechanic
    Join Date
    Apr 2009
    Location
    Owens Cross Roads, Alabama
    Posts
    634

    Default 2002 avalanch stuck in 4 hi

    A friend of mine back home is having trouble with her truck.its an 02 Avalanche with push button 4wd. Im still deployed so Im tryin to help her from here so she wont be lied to at a shop or anything.

    The truck is stuck in 4hi. she has tried to get it into 2wd and 4lo but nothing... She said she can hear somthing under the truck (Im assuming the transfer case) attempting to disengage the 4wd but it never actually does it..so Ive ruled out the possibility of bad switches..any other ideas?


    thanks
    -Dylan
    2004 Silverado 4x4
    4.8L
    1986 K5 Blazer
    8" Superlift w/39.5 super swampers
    1992 GMC Jimmy "Blue Bomber"
    4.3L Vortec

  2. #2
    Master Mechanic
    Join Date
    Apr 2009
    Location
    Owens Cross Roads, Alabama
    Posts
    634

    Default

    anybody????????????
    -Dylan
    2004 Silverado 4x4
    4.8L
    1986 K5 Blazer
    8" Superlift w/39.5 super swampers
    1992 GMC Jimmy "Blue Bomber"
    4.3L Vortec

  3. #3
    Legend


    Enkeiavalanche's Avatar
    Join Date
    Apr 2010
    Location
    Piermont,NY, back in Northern NJ now, But may be in IL soon....
    Posts
    5,319

    Default

    Tell her to check the relays or fuse under the hood. Or it could be something bigger under the truck..
    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

  4. #4

    Default

    Does she have the "Service 4WD" message? Most likely the encoder/motor. Push button 4x4 uses a motor to shift the transfer case in place of a shift lever. It also has a position sensor to tell it where it is, 2hi, 4hi or 4lo, Sometimes it's just the sensor, which can be replaced by itself or it's the motor itself. If it's the motor I believe it comes with the sensor as a whole assembly. She's probably going to have the codes read to determine if it's the motor or just the sensor. I just replaced mine a couple of months ago, mine was just the sensor but I had them replace the whole thing.
    Adam


  5. #5
    Master Mechanic
    Join Date
    Apr 2009
    Location
    Owens Cross Roads, Alabama
    Posts
    634

    Default

    as far as i know shes not getting the famous "Service 4wd" message.but I'll ask her.thanks for the help guys.I'll bring these up to her and see if we can get this thing figured out.It'd be alot easier if i could see it myself haha

    Adam, that sounds like the most likely problem to me..from the way shes describing it to me, it seems like the motor is attempting to shift out of 4hi but just cant pull it off..would you happen to know what the technical term for the motor is?
    -Dylan
    2004 Silverado 4x4
    4.8L
    1986 K5 Blazer
    8" Superlift w/39.5 super swampers
    1992 GMC Jimmy "Blue Bomber"
    4.3L Vortec

  6. #6

    Default

    I'm pretty sure G.M. refers to it as the transfer case encoder motor.
    Adam


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