An assist step assembly includes a linkage assembly including a first linkage member and a second linkage member, an assist step coupled to the linkage assembly and movable from a first assist step position to a second assist step position, an aerodynamic member coupled to the linkage assembly and movable from a first aerodynamic member position to a second aerodynamic member position, a movement mechanism coupled to the aerodynamic member and configured move the aerodynamic member from the first aerodynamic member position to the second aerodynamic member position, and a controller in electronic communication with the movement mechanism, the controller configured to determine an operating condition, determine a position of the assist step based on the operating condition, and generate one or more control signals to move the aerodynamic member from the first aerodynamic member position to the second aerodynamic member position.