4 Wheel Drive/SUVs: 03 GMC Yukon 4x4 Switching on its own., gmc yukon, auto parts stores

Question
I own a 03 GMC Yukon. The 4 wheel drive changes on its own. When I start the truck up it goes from 2 wheel high to 4 low. What could be the problem????????

Answer
Shaun,

I'm not familiar with this rig, or what type of transfer case it has.  It sounds like it has an electrically controlled transfer case, and it is grounding, or shorting out.
I would purchase a repair manual for it, and check out the transfer case section.  These usually cost $20-$30 and can be purchased at most auto parts stores.  They are great if you want to do any trouble shooting, or repairs yourself, as they give step by step instructions, along with pictures of most components.

Carl