There are several meanings of the car engine P3468 Code found but the right meaning of the code is very important. The real meaning of the code is found from the car manufacturer. The automobile dictionary meaning of the code is p for Powertrain Code Problem is related engine, transmission and emissions systems. 3 for SAE – Generic. 4 for Transmission. 6 for Control Module Throttle Actuator Position Performance and 8 for PCM Stack Overrun. The P3468 code had an elaborate diagnostics procedure, including showing engine trouble codes on the air conditioning show. However, the system was troublesome and a rash of random failures controlled to the technology being rapidly discharged.