Meaning of the car engine P1718 Code is p for Powertrain Code Problem is related engine, transmission and emissions systems. 1 for MFG – Manufacturer Specific. 7 for Auxiliary Emission Controls. 1 for Low Coolant Circuit and 8 for PCM Stack Overrun. Deactivation process of cylinders of the car engine is achieved by discharging a synchronizer pin that is usually interlocks the cam rocker and follower arms. The engine P1718 code resolutions the synchronizer pin what is unconfined by using hydraulic compression which is measured by a dedicated solenoid. However, if you do not solve the car engine problem properly, any new problem may start from the car engine again.