The definition of the B2431 Code is found online but that definition is not compulsory thing for solving the car engine problem. The automobile dictionary meaning of the code may misguide you and that is why, you should not try to fix the car engine problem. The real meaning of the code is not available online. The manufacturer of the car has put the meaning in the car engine manual and meanings are different car to car and car model to model. That is why, the automobile engineers needs to know the manufacturer name and model number of the car. Read the manual of the car for getting all information.