just got this message come up on my 08 with 115k
It's still under warranty, looks like it will have to go see the dr tomorrow
edit- this is why I was much happier with the 4x4 system in my GMT-800, I drove the piss out of it.. and was a little neglegant on maintenance since it was pretty old, and the 4x4 would always work without a problem.
My father had alot of issues with the AWD in his 03 trailblazer