The engine P0031 Code is important thing to understand and if this meaning of the code is not known, it will be very difficult for solving the car engine problem. The P0031 OBD 2 code on automobiles with automatically measured automatic broadcasts, the 3-4 shift solenoid is accountable for activating the hydraulic circuits to start clutches or bands that alteration gears inside the automatic show. Solving the car engine is very easy for an automobile engineer. That is why, getting the real meaning of the code is necessary to use. The general meaning of the code is not appropriate for solving the engine problem.