It is important to fix the car engine sooner and for this reason, you need to relay on an expert automobile engineer. The automobile engineer will check the car engine and engine code comes on the engine code reader. The engine P0844 Code is found for your car engine and you need to fix the car engine by the right meaning of the code. The real 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. 4 for BBV Sensor Circuit Low Voltage and 4 for Cruise Vehicle Speed/Set Speed Difference Too High.