The car P2303 engine code seems a sort of powertrain problem and the problem of car engine should be fixed. The meaning of the code helps to know the car engine problem. The meaning of this car engine P2303 Code is found from online and manual of the car engine code. There are presently 2 main kinds of cylinder deactivation used today, depends on the sort of engine. The car engine P2303 code for the pushrod design which uses solenoids to alter the oil compression delivered to the lifters. In their collapsed state, the lifters are unable to raise their companion pushrods under the valve rocker arms, ensuing in valves that cannot be activated and remain closed.