An actuator is a device that helps convert energy into motion or physical movement in a machinery or system. It basically makes things move or perform specific actions. Full definition
Here are my thoughts, having just rebuilt two door lock actuators in one of my vehicles: (mechanics.stackexchange.com)
Code P0720 is for the output speed sensor for the transmission, and code P2016 is for the throttle control actuator in failure mode and may be due to the transmission codes. (yourmechanic.com)
It features a combination of direct and indirect fuel injection, variable valve timing and an electric actuator for the turbocharger's wastegate in a bid to minimise turbo - lag and improve driveability. (motoring.com.au)