The car engine may make trouble if the car engine is not fixed. The car engine P1538 Code is important and it is necessary to solve the car engine. The automobile dictionary meaning of the code is p for Powertrain Code Problem is related engine, transmission and emissions systems. 1 for MFG – Manufacturer Specific. 5 for Computer And Auxiliary Outputs. 3 for Cruise Control Servo Indicates Low and 8 for PCM Stack Overrun. Deactivation of cylinders is achieved by releasing a synchronizer pin that normally interlocks the cam follower and rocker arms. The engine P1538 code resolutions the synchronizer pin is released using hydraulic heaviness which is measured by a devoted solenoid.