Difference between vicarious liability and solidary liability of car owner

Dear PAO,

My private jeepney, which was driven by Ador, bumped into a car, resulting in physical injury to the other driver. The aggrieved car driver is now claiming that I am solidarily liable for the acts of my driver. I am thinking that I am not liable for damages since I was not aboard the jeepney when the incident occurred. What is my liability as a car owner under the circumstances?