Diagnostic code P0020 OBD2 refers to the Variable Distribution System (VVT) components as well as the Powertrain Control Module (PCM). The engine use the VVT (Variable Valve Timing), and this allows it to have more power at different points of operation.
The Variable Valve Timing system consists of the OCV (Oil Control Valve) and its other components. Basically, when this DTC code is established, it means that the voltage in the circuit has fallen and is below the programmed limit for a specific time; it should be noted that there is the variation of limit and time according to each brand. When bank number 2 is mentioned, it refers to the side of the engine that does not have cylinder number 1.