SYSTEM AND METHOD FOR CONTROLLING MILD HYBRID VEHICLE

A method and system for controlling a mild hybrid vehicle are provided. The method includes determining whether a first battery that supplies an electric power to a starter-generator of the mild hybrid vehicle is degraded. The starter-generator and a starter that receives an electric power from the second battery that stores a voltage less than a voltage of the first battery is operated to start an engine within the vehicle when the first battery is degraded and the ambient air temperature of the engine exceeds a temperature reference value.