The engine P0181 Code is really important thing for fixing the car engine problem. Do not drive the car with engine problem. It is related with the powertrain problem and this problem can be fixed easily. The automobile meaning of the code is P for Powertrain Code Problem is related engine, transmission and emissions systems. 0 for SAE – Generic. 1 for Transmission. 8 for Exhaust Gas Recirculation System Valve 1 and 1 for TFP Valve Position Switch-Drive Without Drive Ratio. Diffusion process start of cylinders is achieved by releasing a synchronizer pin that normally interlocks the cam follower and rocker arms. P0181 code tenacities the synchronizer pin is released using hydraulic compression which is maintained by a dedicated solenoid.