You need to solve the car engine and in this case, the car engine code may help most. The car engine P2684 Code is found after it is tested and the car technician should check the car engine all provable ways. The meaning of the code is necessary now if the technician want to know the problem and locate the car engine problem. The meaning of the code describes the car engine problem and it is important to use the right meaning of the code. If the right meaning of the code is not available, the engineer must depend on the general meaning of the engine code.