The present disclosure provides a hybrid vehicle control system for controlling a vehicle having a motor and an engine. The system executes the following processes. The first process is determining whether a situation which the vehicle is currently facing is a situation in which high accuracy is required for control of driving of the vehicle or not. The second process is selecting only an EV mode under a situation in which high accuracy is required for the control. The third process is selecting an engine activation mode only under a situation in which high accuracy is not required for the control. The EV mode is a mode in which the engine is stopped and the vehicle is driven by the motor. The engine activation mode is a mode in which the engine is activated for at least one of power generation for charging a battery and driving the vehicle.