The meaning of B1239 Code may not similar to another engine of car. It is necessary to know the model and name manufacture as well as read the manual of the engine to understand well. For the model and name manufacture, the meaning of the code becomes different. Reading manual is also necessary for solving the problem as well. There are now two key kinds of cylinder deactivation used most and dependent on the sort of engine. The B1239 code for the pushrod plan which uses solenoids to change the oil weight delivered to the lifters. In their misshapen state, the lifters are incapable to raise their mate pushrods under the valve rocker arms, subsequent in valves that cannot be activated and endure shut.