How to fox a P2004 Code: Intake Manifold Runner Control Solenoid Stuck Open Bank 1
An intake manifold runner control (IMRC) opens and closes flaps inside variable intake manifolds, which optimizes airflow into the engine.
Depending on the vehicle, the solenoid can be electric or a combination of electric and vacuum controlled. It receives its signal from the computer (ECM/PCM).
Each manufacturer has a unique IMRC system design.

Possible Causes of a P2004 Code
No Vacuum (Bad or Clogged Hose)
Wring (Open/Short)
Bad Solenoid or Actuator
Runner Flaps/Butterfly Broken or Stuck

By using this information user assumes all risk of use.