Chances are the actuator on the transfer case is bad. What I need you to do is this. Have a helper turn the knob into 4wd while you check to see if there is power at the actuator on the transfer case. If there is power, then the actuator is the most likely cause. NOTE: It isn't uncommon for them to go bad on these vehicles.
Let me know what you find.
Joe
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Monday, December 18th, 2017 AT 3:31 PM