The car engine P2566 Code is very important thing and here the main problem is powertrain problem what is easy to fix but it is necessary to know the real reason of the problem and it is possible to know the right meaning from the car manufacturer. The automobile meaning can be fixed for solving the car engine problem and it is p for Powertrain Code Problem is related engine, transmission and emissions systems. 2 for MFG – Manufacturer Specific. 5 for Computer And Auxiliary Outputs. 6 for Control Module Throttle Actuator Position Performance and 6 for Cruise Control System – Vehicle Accel Too High.