The automobile dictionary meaning of the engine P0816 Code is important thing and for solving the car engine, you need to know the meaning of the code. The automobile dictionary meaning of the engine code is p for Powertrain Code Problem is related engine, transmission and emissions systems. 0 for SAE – Generic. 8 for Ignition System Or Misfire. 1 for Low Coolant Circuit and 6 for Cruise Control System – Vehicle Accel Too High. Without the real meaning of the code, it is difficult to solve the car engine problem. Do not drive the car if the car engine is unfixed.