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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


    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


    thanks it still drives fine but when it says that it wont shift into 4wd but it goes down the road fine

  4. #4

    Join Date
    Feb 2008
    Red Wing, Minnesota, United States


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

  5. #5


    it will go into 4wd when it doesnt say service 4wd but if the light is on it wont go into 4wd

  6. #6

    Join Date
    Feb 2008
    Red Wing, Minnesota, United States


    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

  7. #7


    i havent messed with the dash but i will maybe take it off and look..thanks for the info

  8. #8

    Join Date
    Feb 2008
    Red Wing, Minnesota, United States


    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.

  9. #9
    Legend cascott325's Avatar
    Join Date
    Aug 2008
    Lawrenceburg, Kentucky


    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

  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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