Do not apply wrong meaning of the engine P278C Code for solving the car engine. The automobile dictionary meaning of the code is not helpful for solving the car engine. You may make terrible mistake in the car engine if you use wrong meaning of the code. You should find out the real cause of the car engine problem and solve the problem. Due to the use of the wrong meaning of the code, the engine may get new problem in the car engine. Do not drive the car if the engine problem is still continuing in the car engine.