Intake Manifold Runner Control Stuck Closed Bank 1
The Powertrain Control Module (PCM) detected that the Intake Manifold Runner Control (IMRC) actuator or flaps for Bank 1 are stuck in the closed position. This means the system cannot open the runner valves to increase airflow at higher engine speeds, restricting engine breathing.
While the vehicle is usually safe to drive, the stuck closed flaps restrict airflow at higher RPMs, leading to poor acceleration. It should be diagnosed soon to restore proper engine performance and prevent potential drivability issues.
Common symptoms
- Illuminated Check Engine Light
- Poor acceleration or lack of power at higher engine speeds
- Rough idle or hesitation during acceleration
- Decreased fuel efficiency
- Engine surging or mild misfires under load
Likely causes
- Carbon buildup or debris physically jamming the intake manifold runner flaps
- Defective Intake Manifold Runner Control (IMRC) actuator or motor
- Broken or disconnected vacuum lines (on vacuum-actuated systems)
- Damaged or disconnected wiring harness to the IMRC actuator
- Broken mechanical linkage between the actuator and the runner flaps
- Faulty Powertrain Control Module (PCM) or software issue
What to check before replacing parts
Scan for additional codes and record freeze frame data.
Look for: Check if there are related vacuum, electrical, or sensor codes that might point to a root cause rather than just the mechanical flap.
Visually inspect the IMRC linkage and actuator for Bank 1.
Look for: Look for disconnected, broken, or binding linkage rods, as well as damaged wiring or disconnected vacuum hoses.
Manually actuate the intake manifold runner linkage.
Look for: Disconnect the linkage from the actuator and move it by hand; it should move freely without binding. If it binds, carbon buildup or internal manifold damage is likely.
Test the IMRC actuator operation using a bi-directional scan tool or vacuum pump.
Look for: Command the actuator to open and close. If it does not move despite receiving the correct voltage or vacuum, the actuator itself is faulty.
Check the electrical circuit to the IMRC actuator.
Look for: Use a multimeter to verify proper power, ground, and control signals at the actuator connector. Readings outside manufacturer specifications indicate a wiring or PCM issue.
This page explains the generic P2006 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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