I have a 2005 Tahoe that is going into 4WD by itself and sticking there. Sometimes it goes into Low also. Does anyone know what would be causing this? Thanks for your help.

 

Welcome to the Forum...I had an '05 Trailblazer that did the same thing. I could be sitting still or driving and it would go into 4WD all by itself. When it did thisI just flipped the switch into 4 HI then back to 2WD and it stayed. I never took the time to get it fixed and traded it for my '07 Tahoe with the problem still occurring. Its probably a relay or something simple but I just never got it fixed.