Intake Manifold Runner Control Stuck Open Bank 2
The Powertrain Control Module (PCM) detected that the Intake Manifold Runner Control (IMRC) actuator or flaps for Bank 2 are stuck in the open position. This occurs when the feedback voltage from the IMRC position sensor does not match the commanded closed state from the PCM.
While the vehicle is usually safe to drive, a stuck open IMRC can cause poor low-end torque, reduced fuel economy, and increased emissions. It should be diagnosed and repaired soon to restore proper engine performance.
Common symptoms
- Illuminated Check Engine Light
- Noticeable lack of low-end engine power or torque
- Rough idle or engine hesitation during acceleration
- Decreased fuel efficiency
- Potential surge in engine RPM at higher speeds
Likely causes
- Carbon buildup or physical obstruction binding the intake manifold runner flaps
- Defective IMRC actuator or motor on Bank 2
- Disconnected, cracked, or leaking vacuum lines (on vacuum-operated systems)
- Faulty IMRC position sensor
- Damaged or corroded wiring harness and connectors in the IMRC circuit
- Broken mechanical linkage between the actuator and the runner flaps
What to check before replacing parts
Perform a visual inspection of the IMRC linkage and vacuum lines on Bank 2.
Look for: Look for disconnected or broken mechanical linkages, as well as cracked or brittle vacuum hoses that could prevent actuator operation.
Use a scan tool to perform a bi-directional control test of the IMRC system.
Look for: Command the IMRC open and closed while listening for actuator movement and watching the position sensor data to see if it changes accordingly.
Manually operate the intake manifold runner flaps.
Look for: Disconnect the actuator linkage and move the flaps by hand to check for physical binding, stiffness, or severe carbon buildup restricting movement.
Test the vacuum supply and control solenoid (if the system is vacuum-operated).
Look for: Use a vacuum gauge to ensure adequate engine vacuum is reaching the control solenoid and that the solenoid properly routes vacuum to the actuator when commanded.
Perform electrical testing of the IMRC actuator and position sensor circuits.
Look for: Verify proper power, ground, and signal voltages using a multimeter to rule out wiring faults or a dead sensor.
This page explains the generic P2005 definition and is general reference information, not a diagnosis for your specific vehicle. Actual causes, severity, and repairs vary by make, model, engine, and mileage — always confirm with a scan tool and a qualified technician before replacing parts.
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