What would cause the awd light to be on?

The AWD (All-Wheel Drive) light may illuminate due to several reasons, including a malfunction in the AWD system, low fluid levels, or a fault in the sensors that monitor the system's performance. It can also indicate issues such as a slipping or damaged drive shaft or differential. Additionally, the light may come on if the vehicle is in a mode that disables the AWD feature, such as when the vehicle is in 2WD mode. It's advisable to consult the vehicle's manual or a mechanic for diagnosis and repairs.