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Thread: service 4wd

  1. #1
    Master Mechanic
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    Apr 2009
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    Owens Cross Roads, Alabama
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    Default service 4wd

    anybody know what this thing is tryin to tell me?my 04 silverado 4x4 sees some mud from time to time and every now and then after i shift into 4wd ill get a message sayin service 4wd.anybody know what this is tryin to tell me and is it hard to do my self?
    thanks
    -Dylan
    2004 Silverado 4x4
    4.8L
    1986 K5 Blazer
    8" Superlift w/39.5 super swampers
    1992 GMC Jimmy "Blue Bomber"
    4.3L Vortec

  2. #2
    Sr. Mechanic poncho08's Avatar
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    Default

    I get the same message when I shift from my four-wheel drive in 40 below weather. I don't think it's a big thing because it goes off after a little while eaven my Chevy dealerships sead don't worry about it but when it comes to mud I don't know?

  3. #3
    Master Mechanic
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    Owens Cross Roads, Alabama
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    Default

    when it happens it wont let me shift back to 2wd or 4 low.i have to turn the truck off wait a second start it back off and then shift.im thinkin maybe low diff. fluid but im not sure.ive also noticed it mainly happens going up or down an incline

  4. #4
    Jr. Apprentice 12pack's Avatar
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    Default

    I don't know if this will help but I posted in the Powertrain section about a fix for the push button 4x4. How to reset the 4x4 computer. Pull the 4x4 fuse and turn the key to the on postion ( DON'T START JUST THE ON POSITION) and back to the lock position 5 times slowly.Then replace the fuse and try your 4x4 push buttons. This will reset the 4x4 computer. This fixed my 2003 Avalanche when it would go into 4 LO and be stuck there. Don't no if this will help your problem but I thought I'd just though it out.

  5. #5

    Default

    When you get the service 4wd message, that means the transfer case control module (TCCM) has detected some kind of fault. By the book, you would hook up the system to a scanner that can talk to the TCCM and ask it what problem it is seeing, then diagnose from there. Resetting the system, as suggested may help. If the problem keeps recurring, then you should take the time to get it fixed.

    If you end up "guessing" at the problem, two common areas seem to be the most common problems: the switch (seems to be more applicable to the late '90's/early '00's) or the shift module on the t-case (later years).
    '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

  6. #6
    Jr. Engineer
    97chevz71's Avatar
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    Perry County, Pennsylavania
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    Default

    My dad has a 04 and what happen is the computer in the truck bascially goes to sleep. if you get the computer rebooted it will work fine.

  7. #7
    Sr. Apprentice
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    Mar 2009
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    Kalispell, Montana
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    Default

    Our trucks see alot of mud also. We get these messages from tiem to time. Usually it is the plug is dirty and the computer loses signal to the transfer case. Try cleaning your connections underneath. Otherwise, it could be the encoder motor in the TC.

    HTH
    Scott
    Kalispell, MT :zzz:

    2004 Chevy Suburban-Bone Stock
    2006 Chvey Silverado 1500HD

  8. #8
    Master Mechanic
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    Default

    sorry it took me a while to get back to yall.i been a little sick.but thanks for all the help..ill try to reset the computer and clean up those connestions and go from there.thanks again!

  9. #9

    Default

    Mine does that after I take it out of 4 wheel . It will say service 4 wheel drive about 5 times. Than after a while when I start the truck it will be in 4 Low. When I take it out of 4 low it is fine till the next time I put in 4 wheel.
    2003 Silverado Z71 Ext Cab 100K

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