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4 wheel drive problem, need help

Discussion in 'Chevy Suburban Forum (GMC Yukon XL)' started by rksorrells, Oct 28, 2012.

  1. rksorrells

    rksorrells New Member

    I have a 99 GMC Suburban with the push button four wheel drive system. I was driving the other day and noticed none of the lights on my four wheel drive selector were lit up. I changed out the 20 amp fuse for the transfer case. I can select 4WD Hi or Auto 4WD, when I try to select 2WD while sitting still the light for 2WD flashes for a few moments then stops. 4WD Hi remains lit up. When I try to select 2WD while the vehicle is moving I get the same flashing light on the 2WD button then the 20 amp fuse blows. When I install a new 20 amp fuse the 4WD Hi light is selected. While the fuse is blowed the truck "feels like" it is in 2WD, with a new fuse in the truck "feels like" it is in 4WD (I get a little wheel hop turning a tight corner on dry pavement). I have the new style plastic actuator on the front differential. Any ideas as to what this could be? Can the Auto 4WD really be working? (I live in wyoming and we can have snow at any moment. It would be nice if this feature continued to work properly while I try to figure this problem out.) Any help would be greatly appreciated. Thanks
  2. rksorrells

    rksorrells New Member

    okay. the auto 4wd did not work. with the fuse in it is stuck in 4wd. help?
  3. Pikey

    Pikey Moderator Staff Member 1000 Posts

    I don't have much experience with the push button systems. If it keeps blowing a fuse I would start by crawling under the truck and look around the transfer case for a pinched or broken wire. I was having a similar issue with my 03 yukon xl. I crawled under it and unplugged and replugged in all the connectors. The problem went away. I don't know what my issue was, I assume corrosion in one of the plugs. I have also read that some people have issues with the encoder motor in the tcase, this would cause the same issue.
  4. MCrewsZ71

    MCrewsZ71 New Member

    It is almost always the actuator or the connector for the actuator on the push button 4x4 models. How long ago did you change the actuator? I would also check all the wires like Pikey said. Have you been changing it while you are driving? I was always taught to stop, put it in neutral, select 4HI/4LO, shift to reverse to have it lock in, and then drive. I've always done the same when going back to 2wd. That's why I love my dogbone!!!

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