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2500 4WD switch 2008

Discussion in 'Chevy Trucks' started by fabcraftinc, Dec 6, 2011.

  1. fabcraftinc

    fabcraftinc Member
    Messages: 70

    On one of our trucks the 4WD will not engage. The lights on the switch will go from 2WD, 4WD high, 4WD low; blinking at each once. After it does this sequence, "service four wheel drive" will show up on the message center. Any ideas where to start troubleshooting?
  2. 2COR517

    2COR517 PlowSite Fanatic
    Messages: 7,115

    You need to put it on a scan tool that can communicate with the 4wd module. If you don't have one, take it to a shop that does. Will cost less than throwing parts at it.