The intake manifold has internal fins, which when in operation create turbulence that produces a swirl effect. With this effect, the pulses are canceled, as the valves open and close, giving way to a better air/fuel mixture inside the engine. The position and operation of the flaps are determined by the ECM (Engine Control Module) via an Intake Manifold Runner Control (IMRC) solenoid.
If the Engine Control Module sets the P2011 OBDII diagnostic code, it is because it cannot determine the position of the flaps due to a problem in the electrical connections in the Intake Manifold Runner Control bank 2 circuit.