Improperly towing AWD vehicle can cause many problems

DEAR CAR TALK: I had my 2000 Cadillac Escalade towed to the mechanic, and he determined that my battery needed to be replaced. After the new battery was installed, I was informed that the “4-wheel” light on the dash was constantly on, and that the mechanic could not determine the cause.

He referred me to a dealership that specializes in Cadillacs. When I mentioned to the mechanic there that my vehicle had been hitched from the rear and towed approximately 15 miles riding on the front wheels, he suggested that that could be the cause of the light not turning off, because the vehicle should have been transported riding on top of the tow truck bed rather than being towed with the front wheels on the ground.

Could this actually be the cause of the light constantly being on, or could it be a module that needs replacing?

... read more at: https://www.pressherald.com/2018/04/11/improperly-towing-awd-vehicle-can-cause-many-problems/