The B1861 Code shows that the problem of the engine seems on the body of the engine. If you want to fix the problem of the engine, the meaning of the code is important thing to know. Without getting the real meaning of the code, it is not possible to solve the problem. The dictionary meaning of the code is not real meaning but it helps you to know the problem. From the dictionary meaning, it is identified that the problem of the engine is associated with the body of the engine. You need to know the real meaning what you can know from the manufacturer and model number.