You must test the car engine when the car engine is faulty and the engine P0809 Code lets you know about the problem and location of the problem. The automobile dictionary meaning of the code may not perfect for your car engine. When you need to solve the car engine, you must look for the real meaning of the code for fixing the car engine. The automobile dictionary meaning of the code is p for Powertrain Code Problem is related engine, transmission and emissions systems. 0 for SAE – Generic. 8 for Ignition System Or Misfire. 0 for IC Circuit High Voltage and 9 for Kick-Down Switch Failed Short.