The car engine P2451 Code lets you know the problem of the car engine. Here, the main problem is powertrain and you will know more information for solving the car engine. The car engine’s problem can be serious and if you want to solve the car engine problem, you need to solve the root problem from the car engine. If you do not fix the car engine’s root problem, you may get new problem in the car engine. It is a better idea if you hand over the car to an expert automobile engineer. Do not allow any inexpert automobile engineer.