The engine P2756 Code helps to fix the car engine if you know the real meaning of the code. The meaning of the code is found from various sources but you will allow only the right meaning what will be from the automobile manufacturer. The automobile manufacturer sets the meaning of the code in engine manual. if the real meaning of the code is not found, use automobile dictionary meaning and it is p for Powertrain Code Problem is related engine, transmission and emissions systems. 2 for MFG – Manufacturer Specific. 7 for Auxiliary Emission Controls. 5 for TP Sensor Learn Not Complete and 6 for Cruise Control System – Vehicle Accel Too High.