The common meaning of the P20D7 Code is useful for knowing but not it is necessary to use for solving the car engine problem. The general 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. D for BBV Sensor Circuit Low Voltage and 7 for Cruise Inhibit Control Circuit. The engine system initiates the P20d7 code solenoid valve to control oil pressure to the engine mechanism that is connected in the valve system to change valve timing between High and Low. If the engine solenoid valve has an open circuit, a DTC is stored.