The "Service 4wd" light comes on after 5 min of starting and won't shift out of Auto4x. I don't know about the Tech 2 scanners but the regular ones you have to have the truck off and turn the ignition on yada yada. Will a Tech 2 scanner still read the code even if the light isn't on? My regular scanner picks up some code that it can't read, says "unknown" or something. Could this be my TCCM code possibly?

 

A tech 2 will read the code from the history even if it's not active.