Intake Manifold Runner Position Sensor/Switch Circuit Range/Performance Bank 2
The powertrain control module (PCM) monitors the intake manifold runner control (IMRC) position sensor to ensure the runner flaps are opening and closing correctly. Code P2020 is set when the PCM detects that the signal from the Bank 2 IMRC position sensor is out of its expected range or not correlating with the commanded position.
While the vehicle can usually still be driven, the engine may experience reduced power, poor fuel economy, and rough idling. It should be diagnosed soon to restore proper performance and prevent potential long-term emissions issues.
Common symptoms
- Illuminated Check Engine Light
- Poor acceleration and reduced engine power
- Rough or fluctuating engine idle
- Decreased fuel efficiency
- Engine hesitation or surging during acceleration
Likely causes
- Carbon buildup causing the Bank 2 intake manifold runner flaps to bind or stick
- Faulty Bank 2 intake manifold runner position sensor
- Damaged, corroded, or loose wiring and connectors in the sensor circuit
- Failed intake manifold runner control actuator or vacuum solenoid
- Vacuum leaks in the IMRC control system (if vacuum-actuated)
What to check before replacing parts
Visually inspect the wiring harness and connectors for the Bank 2 IMRC sensor and actuator.
Look for: Look for frayed wires, melted insulation, or corroded pins that could cause high resistance or an open circuit.
Manually actuate the Bank 2 intake manifold runner linkage.
Look for: Feel for binding, sticking, or excessive looseness in the linkage, which indicates carbon buildup or mechanical failure of the flaps.
Use a scan tool to monitor the Bank 2 IMRC position sensor data PID while commanding the actuator.
Look for: The sensor voltage or percentage should change smoothly in response to the commanded position without dropping out or spiking.
Test the IMRC position sensor reference voltage and ground circuits with a digital multimeter.
Look for: Verify there is a steady 5-volt reference and a solid ground at the sensor connector; missing voltage indicates a wiring or PCM issue.
Inspect and test the IMRC actuator and associated vacuum lines (if vacuum-operated).
Look for: Apply vacuum with a hand pump to see if the actuator holds vacuum and moves the linkage fully, indicating the actuator is not ruptured.
This page explains the generic P2020 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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