The trouble P0149 Code is found in the car engine and this code tells about the car engine problem. This problem of the car engine can be a reason of Fuel pump/fuel injection pump. By the proper diagnosis, the real car engine problem can be identified. There are some symptoms of the problem in the car engine. One of the symptom of the car engine problem is the ECM may light. The limp-home mode is another symptom of the car engine problem. By the diagnosis of the engine, it is easy to know the problem and follow the right way to fix the car engine.