The meaning of the engine C1239 Code is necessary to know and real meaning of the code is highly necessary. Do not drive the car, if the car engine problem is not solved. The car engine C1239 OBD 2 code on cars with automatically measured automatic shows, the 3-4 shift solenoid is responsible for actuating the hydraulic circuits to activate clutches or bands that change gears inside the automatic transmission. For checking and fixing the car engine, getting real meaning of the code is necessary. If you do not have all information and correct meaning of the code, it is not necessary to solve the car engine problem.