DTC P2009 OBDII indicates that the Intake Manifold Control (IMRC) solenoid or actuator has a low voltage condition.
The purpose of the intake manifold runner is to increase or decrease the speed at which the intake air flows through the inlet manifold. These adjustments are accomplished through an actuator. It is considered the engine speed, throttle position, throttle plate movement speed, and environmental factors.
If the Powertrain Control Module (PCM) discovers that the circuit controlling the IMRC solenoid has excessive low voltage, the Check Engine light will illuminate next to this code.