Maybe just the bulb burned out? Do these newer trucks even have bulbs? I have the same truck, man hubs/shift lever/year. I was looking at mine the other day, remember seeing the wiring that I thought would go to that, but don't remember if it's on the shifter linkages along side the trans, or if it's directly on the transfer case... think it's on the transfer case. Crawl under the truck and look... along the drivers side of the trans, you'll see the shifter linkage, and where it goes back to the transfer case. the only wires that I know of that go to the transfer case should be for the 4x4/low range switch/indicator lights.
However, I'm new to these trucks, someone else here will know more than I.... just my 2 cents worth...
Good luck!
Greg