Originally Posted by BUC NASTY
Got my tccm reflashed with the lastest updates and problems solved.
I think this was his suggestion.
Your transfer case is stuck in neutral, with the service 4wd light on.
There are fault codes generated by the TCCM, you need to have these read (now that's gonna be a problem if you can't move the truck).
You need to borrow a TCCM (friend maybe) to see if this solves the problem. It'll be hit or miss if you can't get the codes read.
BTW, the TCCM is under the dash, near the drivers left knee
We have some pics of the TCCM, on here, but there are so many TCCM threads that it will be a long search