If you read a little deeper, you would have found that some people have successfully reset the computer and encode motor by removing the negative battery terminal. Leave it disconnected for 10 minutes, then bolt it back on snug. Start the truck and hit the 2-Hi button. This should put it right back to where it belongs, as sometimes the control module suffers from what was called "logic lock". If this does not cure it, then read a little more deeply - there have been others that have successfully fixed their problems via different methods. But try the battery disconnect trick before you get any deeper into it.
