This engine P3486 Code is available in multiple car engines from different car manufacturer and you must learn the cause of the car engine problem and collect the real meaning of the code to know about the problem. The powertrain of the car engine is here the main problem and the letter P has emerged for this reason. 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. 8 for Exhaust Gas Recirculation System Valve 1 and 6 for Cruise Control System – Vehicle Accel Too High.