There are presently 2 main kinds of cylinder deactivation what is used today and it depends on the kind of engine. The car engine P2256 code what is used for the pushrod design which uses solenoids to change the oil compression transported to the lifters. In their distorted state, the lifters are impotent to raise their companion pushrods under the valve rocker arms, resulting in valves what cannot be actuated and endure closed. The car engine should be fully ok before driving the car. Otherwise, the general problem may be a cause of serious car engine problem and solve the car engine as soon possible.