Choose the right meaning of the car engine P3400 Code to know the genuine cause of the car engine problem. Knowing the right meaning of the code is important for solving the car engine but if the real meaning of the code is not available, then you may depend on the general meaning. The automobile dictionary meaning or the general meaning of the code is p for Powertrain Code Problem is related engine, transmission and emissions systems. 3 for SAE – Generic. 4 for Transmission. 0 for IC Circuit High Voltage and 0 for Transmission Engaged At High Throttle Angle. Do not use any other meaning of the code for solving the car engine issue.