Hate to admit it but drtom might be on to something.

 

I had that replaced a few months ago before this problem occurred. I also replaced the transfer case motor encoder and the problem is still occurring.

I have no idea what else to do. Took it to 5 different places and no one knows what the problem is.

 

Had that already replaced about a month before the issue began.

 

Does not mean they did it correctly or did us crew something up inside your Tcase while replacing it. I
From your descriptions it definitely sounds like a Tcase issue.

 

I'm having the same issue with mine currently and nobody can diagnose it that I've taken it to so I was wondering if you ever found out what was wrong with your Hummer?

 

Here we go again, digging up OLD AZZED Threads [like 6 YEARS OLD] to tack on a question. READ: Old Threads/'Necro-Bumping'

Same problem as what?

Start a NEW Thread, year, model, miles, and a detailed description of your issue(s).