I have a 2007 Chevy Tahoe LTZ. A message displayed on my dash this morning to "Service 4 Wheel Drive." The dial will turn to the Auto setting, but will not go into Auto. Instead, the light for 4 High will display. Is this a common issue? What needs to be done to fix?

 

there is an fault set in one of the modules...transfer case control module, pcm/ecm. have the code read and post them here.

 

You can get the codes read for free at Auto Zone, Orileys, Advance, etc.. That code should tell you which part is going south.