Simple fix
I had the same problem every time I hit a bump in the road- the AWD disabled light would pop on. Turned out the indicator was bad around the sensor and they could fix it for a steep amount, but they couldn't guarantee the problem wouldn't return. I looked at what the mechanic had done and noticed what looked like duct tape around the wires under the truck. I got under the truck, used some good ol' duct tape and simply put more tape around the differentiater wires and secured the wires to the underside of the truck. Since then, I've rarely had the AWD disabled light come on. Untimately, the truck hasn't been affected by this warning light at all. Hope that helps.