The B2449 Code is related with the car engine and it is impossible to solve the problem without getting the accurate meaning of the code. You should not rely on the general meaning of the code. Because the general meaning of the code is not helpful at all. You should study the meaning of the manufacture for your car. Do not think to solve the car engine problem if you have no tool and experience for solving the car engine problem. The general meaning of the code is found online and you have no need to use that meaning for solving the car engine problem.