To provide an actuator for a change gear shaft (12) of a vehicle automatic transmission.

The actuator comprises a housing (10), an actuating shaft (14) rotatable and attached to the housing (10), electric motors (22, 26), reversible low loss reduction gears directly connecting a rotor (26) of the electric motors (22, 26) to the actuating shaft (14), a spiral spring (54) wherein a tension forming an energy storage means driving an actuating means (14) to a parking position independently on the electric motors (22, 26) is previously added, an electronic control device for driving the electric motors (22, 26) as a function of a control signal and a connecting means for connecting the actuating shaft (14) to a change gear shaft (12) of an automatic transmission.