The engine P1264 Code has many meanings and right meaning of code is important thing but the automobile dictionary meaning of the code can be found from online and it is p for Powertrain Code Problem is related engine, transmission and emissions systems. 1 for MFG – Manufacturer Specific. 2 for Accelerator Pedal Position (APP) Sensor 1 Performance. 6 for Control Module Throttle Actuator Position Performance and 4 for Cruise Vehicle Speed/Set Speed Difference Too High. If you do not how to use the right meaning and how to fix the car engine, you should read the car engine manual.