If you avoid any serious problem from the car engine, you need to check the car engine and all important parts of the car engine. The car engine P3404 Code is found in the car engine and collect the real meaning for solving the car engine. The powertrain of the car engine is faulty and you need to fix this problem from the car. However, do not think that the powertrain problem is general problem and you should not avoid the problem. Solve this car engine problem as soon as possible. Otherwise, you may face terrible problem what is not easy to fix.