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  1. #1

    Default service 4 wheel drive light

    I have a 2008 Silverado, 5.3, 4WD (obviously) and the service 4WD light came on. I changed the actuator, the problem "seemed" to go away. It was gone for 3 weeks. Went out today and the light is on again. But this time, it is stuck in 4 low. I tried shutting off the truck, waited and restarted it, still on. Unplugged the actuator, replugged it in, to make sure the plug was on completely and locked on. All good there, no corrosion on the contacts, any ideas???

  2. #2

    Default

    I have seen this issue caused by a few different things. first, the encoder motor that shift the t-case could be bad. Second, the dash switch itself. And third: I was at a dealer getting some warranty work done and a guy with a 2009 4x4 was there with the same issue. They told him that the BCM needed reflashed. So, he tried it. Drove out and came back 10 minutes later, it had shifted into 4 low again, at this point they blamed it on the t-case and told him that it needed replaced.

    So, I guess that I would start by checking out the dash switch, they are know to have some bad solder joints in them. Then I would move onto checking out the encoder motor.

    1995 Silverado 4x4
    6" BDS Suspension Lift-3" Body Lift-Add A Leaf in rear -Trailmaster SSV Shocks-Duel Steering Stabilizer Kit -AirAid Cold air intake-
    4.56 Gears with Detroit Auburn Locker-Pro-Comp Traction Bars with duel shocks-Aluminum Skid Plate Kit-38.5" x 16.5" Mickey Thompson Baja Claws-Constant Dropping fuel gauge

    2005 Yukon XL Jet Power Programmer, Bilstein Shocks, Bilstein rear springs, Helwig Anti-sway bars, EGR Window Visors, EGR Hood Shield, Denali Headlights, Headlight harness upgrade, GE NightHawk Bulbs, White Night Rear lighting system, Russell Braided SS brake lines, PowerStop Brake pads, PowerStop cross drilled and Slotted Rotors, http://www.gmtruckclub.com/forum/sho...5-GMC-Yukon-XL
    2002 Silverado ext cab 2wd (Sold)
    2003 Yukon XL (Totaled)

  3. Thanks wmc3 thanked for this post
  4. #3

    Default

    I will look into that tomorrow after my first pot of coffee!!

    - - - Updated - - -

    UPDATE>>>> I replaced the dash switch, got it out of 4 low, and now it is in "Auto". and stuck there. I can't get it to go back to 4 WD, or 2
    WD.......time for a beer.... Still up for an suggestions....
    Quote Originally Posted by wmc3 View Post
    I will look into that tomorrow after my first pot of coffee!!

  5. #4

    Default

    Hello wmc3,

    As a customer service representative, I'm not able to provide much in the way of do-it-yourself information, so I'm glad to see forum members are beginning to step in with feedback. If you have any lingering concerns please contact me via private message.

    Jennifer T.
    GM Customer Care

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