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4x4 not working

  1. 4X4 shifts by itself?

    I4/I5 Engine & Drivetrain
    Hello there. New member here and first time poster. Been reading through lots of 4x4 issue posts but I haven't seen any solutions to my issue. sometimes at idle or even while driving my truck will randomly shift into 4hi. Sometimes with a service 4wd message. to save my front end while I'm on...
  2. What's the next step

    I4/I5 Engine & Drivetrain
    Bought a 04 Colorado a couple of weeks ago. It has a service 4wd light on. I have replaced the front actuator, tccm, transfer case shift motor, and push button selector and still have no 4wd. I have been testing voltages today and have found that the light blue wire on the front actuator is not...
  3. Tranfer case control module info

    I4/I5 Engine & Drivetrain
    I'm just posting this because I had a transfer case issue today and it took me a while to track down the part number so I wanted to make someone else's life easier in the future. The Transfer case control module that is located under the drivers seat is part number 98146600. GMPartsGiant.com is...
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