The engine P015B Code should be fixed and it is neceesary to know the menaing for solving the problem. There are many codes available and all those codes are related engine as well as those codes are set by the manufacturer and model of the engine. This code has several meanings what set by the manufacturer. The common meaning of the code is not so helpful for solving the problem of the car engine. For getting the real meaning of the code, read the manual of the code. However, for the P, it means Powertrain Code – Problem is related engine, transmission and emissions systems.