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  1. #1

    Default 2004 Seirra 4WD service light??

    my 4WD service light will come on every now and again but when i shut the truck off and turn it back on it goes way. anybody know anything about this?
    2004 GMC Sierra
    pace headers
    magna flow muffler
    gm performance intake
    305/70/16 Toyo MT
    16in hello maxx rims
    1987 Chevy K5 blazer
    stock 350
    4" lift 35s

  2. #2

    Default

    I'm not sure if it's related, but when I modify my Hypertech Power Programmer III on my 04, the service 4wd comes on. The only problem I ever had was the neutral light would come on on the 4wd selection but the truck would still drive fine. Advance Auto's will check codes for free, which may be a good start.
    6" BDS Suspension Lift / 3" Body Lift / 38x15.50x20 Dick Cepek FCII on 20x12 Dick Cepek DC-1 (summer set) / 325/80/16 Dick Cepek FCII on 16x8 American Racing Diamond Back (winter set) / Hypertech Power Programmer III / Air Max Spiral Flow Air Intake / / 80mm Granetelli MAF / 80mm BBK Throttle Body / Helix Power Tower Plus Throttle Body Spacer / 2 Turbonators / Edelbrock Shorty Headers / 30 Series Flowmaster / 4.56 gears /

  3. #3

    Default

    thanks it still drives fine but when it says that it wont shift into 4wd but it goes down the road fine
    2004 GMC Sierra
    pace headers
    magna flow muffler
    gm performance intake
    305/70/16 Toyo MT
    16in hello maxx rims
    1987 Chevy K5 blazer
    stock 350
    4" lift 35s

  4. #4
    Legend

    Join Date
    Feb 2008
    Location
    Red Wing, Minnesota, United States
    Posts
    3,356

    Default

    the actual modual could be going, will it go into 4wd
    99 K1500 Suburban LT "THE BEAST"
    Hypertech III, K&N, true dual
    285/75/16
    ___________________________
    Jason

  5. #5

    Default

    it will go into 4wd when it doesnt say service 4wd but if the light is on it wont go into 4wd
    2004 GMC Sierra
    pace headers
    magna flow muffler
    gm performance intake
    305/70/16 Toyo MT
    16in hello maxx rims
    1987 Chevy K5 blazer
    stock 350
    4" lift 35s

  6. #6
    Legend

    Join Date
    Feb 2008
    Location
    Red Wing, Minnesota, United States
    Posts
    3,356

    Default

    i would bet its the actual module in the dash, have you ran any lines recently through your dash? i did and one of the lines was resting on the lines for the module, it actually pushed that line against the firewall and caused it to rub on a hole in the firewall eventually shorting it when the insulation was gone
    99 K1500 Suburban LT "THE BEAST"
    Hypertech III, K&N, true dual
    285/75/16
    ___________________________
    Jason

  7. #7

    Default

    i havent messed with the dash but i will maybe take it off and look..thanks for the info
    2004 GMC Sierra
    pace headers
    magna flow muffler
    gm performance intake
    305/70/16 Toyo MT
    16in hello maxx rims
    1987 Chevy K5 blazer
    stock 350
    4" lift 35s

  8. #8
    Legend

    Join Date
    Feb 2008
    Location
    Red Wing, Minnesota, United States
    Posts
    3,356

    Default

    I know when mine went out the dealership didnt charge me anything to test it, but my dealership seems to be a rarity in that it treats its long time customers very well.
    99 K1500 Suburban LT "THE BEAST"
    Hypertech III, K&N, true dual
    285/75/16
    ___________________________
    Jason

  9. #9
    Legend cascott325's Avatar
    Join Date
    Aug 2008
    Location
    Lawrenceburg, Kentucky
    Posts
    1,709

    Default

    im having the same problem, i have it figured out though, i have a short in one of the harnesses in the back of the module. every time i hit a bump or my base is too high it will make the light come on. all i need is some electric tape or a tie wrap, but i just dont feel like taking it all apart. mine however, will switch into 4wd even though it may take a min or 2 longer.
    2000 silverado with a 5.3l v8, shorty headers, upgraded plugs, 10 mil wires, magnaflow high flow cats, flowmaster 80 series muffler(2 in 2 out) w/ 18 inch stainless silverline tips. i have a k&n CIA. its a 4x4 z71 offroad package. Ls model.
    extended cab 160k miles, truxedo low profile bed cover, diablo sport predator tuner.
    reman tranny @ 130k miles
    Chris

  10. #10

    Default Most Likely...

    It is the dash control panel switch (Part # 15136039 - $84) which is fairly easy to replace yourself or the sensor in the encoder motor which I am in the process of trying to find some procedures to replace it, but I have heard it isn't too bad if you follow some procedures. I have bought the sensor already (part # 88962315 - $110) for my 2004 Chevy Silverado.

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