The engine P0734 Code lets us know about the car engine problem and the car engine should be fixed by the correct meaning of the code. The automobile dictionary meaning of the code is not suitable for solving the car engine and it is found easily online. The automobile dictionary meaning of the code is p for Powertrain Code Problem is related engine, transmission and emissions systems. 0 for SAE – Generic. 7 for Auxiliary Emission Controls. 3 for Cruise Control Servo Indicates Low and 4 for Cruise Vehicle Speed/Set Speed Difference Too High. If you do not know how to fix the car engine, you must give the automobile engineer to solve the car engine.