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  1. #1

    Default service 4wd indicator

    i have a 2006 vortec max 1500 4 X 4. while im driving the service 4wd will display. will not go into 4wd, but if i stop and turn off truck. start truck back up, then it will go into any 4wd mode. but again after driving a while will all repeat again. if i could please get some help. wondering if it might be a bad relay or somethin. thanks..

  2. #2


    SOP when the service 4wd light comes on is to hook it up to a diagnostic computer and see what fault the 4wd computer is seeing and diagnose from there. Without that step, we'd just be guessing what it might be.

    I don't know if the '06 still had the same problem, but it seems that my vintage had issues with the switch, and a lot of people "guess" that the switch is bad and replace it and go on.
    '98 K1500 Suburban LS 5.7 L 4L60E NV246 ARB
    '92 Ford Explorer XLT 4x4 4.0 L A4LD BW13-54 Trac-loc rear
    "My toys were the greasy cogs and springs and pistons that lay around all over the place, and these, I can promise you, were far more fun to play with than most of the plastic rubbish children are given nowadays." Danny in Roald Dahl's Danny The Champion of the World

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