To get meaning of the P20C8 Code, you should study the car engine manual and car manual. Do not make any trouble if you have no expertise for solving the car engine problem. The general or dictionary meaning of the code is not enough for solving the car engine problem but you can know the meaning of the code according to automobile dictionary. The meaning of the code is P for Powertrain Code Problem is related engine, transmission and emissions systems. 2 for MFG – Manufacturer Specific. 0 for Fuel And Air Metering. C for BBV Sensor Circuit Low Voltage and 8 for PCM Stack Overrun.