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99 Silverado 4WD Kaput - Quit working

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  • 99 Silverado 4WD Kaput - Quit working

    Was coming back from town yesterday, stopped at the mailbox, lights on the 4 wheel drive switch flashed, then no joy, truck stuck in 2WD I have never worked on a electronic 4WD Chevy system, so don't even know where to start. This is an all electronic system, when the lights went out, the Service 4WD warning indicator came on and glowed steady.

    Any of you guys with Chev's had this happen?

    99 Silverado 1500, 4WD, ABS Electronic shift 4WD, 4 speed auto trans.

    Any help appreciated.

  • #2
    check the actuator motor on the T-case.
    Cheesehead boating the Gulf Coast of FLA 27.51° N, 82.53° W

    1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - https://forums.iboats.com/forum/owner...988-rogue-2420

    Past Boats
    1970 Wooster Hellion - Merc 9.8
    2002 SeaRay 190BR - 5.0 - A1G2 - "Cheeseheads in Paradise"
    1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

    What’s behind you doesn’t matter.Enzo Ferrari

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    • #3
      I don't know if it's what's happened to yours but they had a habit of building up corrosion between the transfer case and the actuator housing. The pressure would break the actuator motor housing.
      "Growing old is mandatory. Growing up is optional."

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      • #4
        Just remember, even "electronic" controlled systems still has to have mechanical movement going on to work. That said, every type electronic setup has to have either solenoids or little motors to do what you would do without the electronics. So it seems overwhelming, but it really isn't once you get looking into it.
        Tom Boy Boat Project https://forums.iboats.com/forum/boat...s-what-trailer
        Rebuilt trailer project https://forums.iboats.com/forum/gener...r-back-to-life
        '76 40 HP Johnson rebuild https://forums.iboats.com/forum/engin...mplete-rebuild
        Minn Kota 599 Project https://forums.iboats.com/forum/boat-...ta-599-project

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        • #5
          just google silverado transfer case actuator.... its a simple system
          Cheesehead boating the Gulf Coast of FLA 27.51° N, 82.53° W

          1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - https://forums.iboats.com/forum/owner...988-rogue-2420

          Past Boats
          1970 Wooster Hellion - Merc 9.8
          2002 SeaRay 190BR - 5.0 - A1G2 - "Cheeseheads in Paradise"
          1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

          What’s behind you doesn’t matter.Enzo Ferrari

          Comment


          • #6
            I am aware it is not a complicated system, but there is 3 main electronic points in it and I was just wondering if there is a certain one of those items that are a common item to stop working.

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            • #7
              the actuator motor can is one of the most common failures, wiring is the second. there usually is a trans or BCM DTC which can be read by the Tech 2 or the snap on scan tool. a simply OBD code reader wont read anything except engine DTC's

              FYI, the DTC's get you in the neighborhood, visual inspection and testing will be required.

              https://www.motor.com/magazinepdfs/062004_07.pdf
              Cheesehead boating the Gulf Coast of FLA 27.51° N, 82.53° W

              1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - https://forums.iboats.com/forum/owner...988-rogue-2420

              Past Boats
              1970 Wooster Hellion - Merc 9.8
              2002 SeaRay 190BR - 5.0 - A1G2 - "Cheeseheads in Paradise"
              1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

              What’s behind you doesn’t matter.Enzo Ferrari

              Comment


              • #8
                MTboatguy,did you figure it out?

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                • #9
                  Originally posted by 82rude View Post
                  MTboatguy,did you figure it out?
                  Not yet, I have not been able to get it home yet, I had to pick up a new set of chains for it, it is sitting at a buddy's house right now and I will go down and put the chains on it and get it home in the next day or so, so I can start the diagnosis it and see which part went bad..

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                  • #10
                    Best of luck.

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                    • #11
                      MTboatguy, keep us updated, I am interested in what you find... But be careful as well...
                      Tom Boy Boat Project https://forums.iboats.com/forum/boat...s-what-trailer
                      Rebuilt trailer project https://forums.iboats.com/forum/gener...r-back-to-life
                      '76 40 HP Johnson rebuild https://forums.iboats.com/forum/engin...mplete-rebuild
                      Minn Kota 599 Project https://forums.iboats.com/forum/boat-...ta-599-project

                      Comment


                      • #12
                        Sign up today
                        Originally posted by gm280 View Post
                        MTboatguy, keep us updated, I am interested in what you find... But be careful as well...
                        Thanks guys, I will just not real interested in going out and fixing it right now, it is below zero, we have got about a foot of snow this last few days and we have had heavy winds, so it is quite uncomfortable outside right now.

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