I have an '04 z71 trim and it wont shift into 4 lo, with service 4wd message popping up everytime i start the truck n start moving. And yes, im having it in neutral when trying. It'll shift into 4 high no problem. The light on the selector switch will just blink for the 4 low and go back to 2wd or 4hi. I know, "take the truck in to have it scanned." But maybe i can get suggestions on what to check at home to diagnose the issue. I want to try to avoid paying the shop's scanning/diagnosis fees if i can, if yall can relate lol. Ive tried searching as well but couldnt find anything relating to my issue.