This engine P0777 Code is a helping thing what you can use for solving the car engine. You may face terrible problem in the car engine if the right meaning of the code is not used. The automobile dictionary meaning of the code is p for Powertrain Code Problem is related engine, transmission and emissions systems. 0 for SAE – Generic. 7 for Auxiliary Emission Controls. 7 for Vehicle Speed Output Circuit and 7 for Cruise Inhibit Control Circuit. It is not suitable for solving the car engine at primary basis. You should relay of the automobile engineer for solving the car engine problem.