Intake Manifold Runner Control Circuit/Open Bank 2
Diagnostic trouble code P2011 indicates that the engine control module (ECM) has detected an open electrical circuit in the Intake Manifold Runner Control (IMRC) system for Bank 2. This means the computer cannot properly communicate with or control the actuator responsible for adjusting airflow into the engine cylinders on the side opposite of cylinder number one.
While the vehicle is usually safe to drive, the engine may experience reduced performance, poor fuel economy, and rough idling. It should be diagnosed and repaired soon to restore optimal engine efficiency and prevent potential drivability issues.
Common symptoms
- Illuminated Check Engine Light
- Rough or fluctuating engine idle
- Hesitation or stumbling during acceleration
- Noticeable decrease in engine power at low RPMs
- Reduced fuel economy
Likely causes
- Disconnected or damaged wiring harness to the Bank 2 IMRC actuator
- Corroded or loose electrical connector at the Bank 2 IMRC solenoid
- Failed Bank 2 Intake Manifold Runner Control (IMRC) actuator/solenoid
- Carbon buildup causing the runner flaps to bind (sometimes triggering circuit faults)
- Failed engine control module (PCM/ECM) (rare)
What to check before replacing parts
Inspect the wiring harness and connector leading to the Bank 2 IMRC actuator.
Look for: Disconnected plugs, frayed wires, or visible corrosion inside the connector terminals that would cause an open circuit.
Measure the internal resistance of the Bank 2 IMRC actuator using a digital multimeter.
Look for: An infinite resistance (OL) reading, which confirms the actuator solenoid has an internal open circuit and requires replacement.
Check for proper reference voltage and ground at the IMRC actuator connector with the ignition on.
Look for: A lack of voltage or ground, indicating a wiring issue between the PCM and the actuator rather than a faulty actuator itself.
Disconnect the actuator linkage and manually move the intake manifold runner flaps.
Look for: Binding, sticking, or excessive resistance caused by carbon buildup, which can sometimes overload the circuit or prevent proper operation.
Use an advanced scan tool to command the Bank 2 IMRC actuator open and closed.
Look for: No physical movement or a failure to change state on the scan tool data, confirming the circuit is open or the actuator is completely unresponsive.
This page explains the generic P2011 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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