The car engine P2704 Code tells about the car engine’s powertrain problem and the problem of the car engine is easy to solve. However, you must know the full meaning of the car engine code for solving the car engine. The automobile dictionary meaning of the code is p for Powertrain Code Problem is related engine, transmission and emissions systems. 2 for MFG – Manufacturer Specific. 7 for Auxiliary Emission Controls. 0 for IC Circuit High Voltage and 4 for Cruise Vehicle Speed/Set Speed Difference Too High. This car engine code’s meaning is very useful and important for solving the car engine problem.