Find out the right meaning of the car engine code and know the meaning of this code for solving the car engine. The meaning of the code can be found only by the machine test and the car engine P2787 Code is found from the car engine and general meaning of this code is p for Powertrain Code Problem is related engine, transmission and emissions systems. 2 for MFG – Manufacturer Specific. 7 for Auxiliary Emission Controls. 8 is Exhaust Gas Recirculation System Valve 1 and 7 for Cruise Inhibit Control Circuit. The general meaning of the code helps most for solving the car engine but you need to look for the actual meaning of the code first.