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Service 4WD

Discussion in 'Chevy Trucks' started by chcav1218, Sep 10, 2008.

  1. chcav1218

    chcav1218 Senior Member
    Messages: 954

    The service 4WD light is on in my truck, but when I turn the truck off and then restart it, the light will turn off and won't turn on until a few days, sometimes weeks, later. What could be the issue?
  2. grandview

    grandview PlowSite Fanatic
    Messages: 14,609

    Could be a faulty bulb in the idiot light!
  3. JohnnyRoyale

    JohnnyRoyale 2000 Club Member
    Messages: 2,935

    From what your tellus us...I would gather its the 4wd.(Just kidding) Just put some black electrical tape over it and it will appear to have gone away.
  4. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    Many, many, times its the switch panel itself that creates this issue. In fact there's a GM TSB on the switch assembly for the '99-'02 trucks. Replacement switch assembly runs around $50-$60. Very, very common.

    Once in a while its the encoder motor on the T-case itself...but the switch is way more of a common failure. Scanner that will read body codes will tell you for sure.
  5. ticki2

    ticki2 Senior Member
    from NH
    Messages: 175

    Mine did that for about a year , if I hit a function button on the steering wheel it would go away , sometimes a week ,sometimes a month. Finally tried changing the switch and it hasn't showed up in over a year. There is also a ground connection on the body mount under the drivers door . Make sure that is clean and tight.