SVC 4WD light on 2005 Dodge Dakota

The “Service 4 WD” indicator light came on and stayed on for about 5 miles this morning. I rarely use the 4WD function usually just using it on a dirt road to make sure it gets used. Would this indicate the need for a fluid change or is something more sinister afoot?

I would get it scanned first. They said on this forum that the TCCM Transfer Case Control Module is what causes it. Another forum said CTM Central Timing Module replacement fixed it. Either way you can replace it with one from the salvage yard much cheaper.