Intake Manifold Runner Position Sensor/Switch Circuit Intermittent Bank 2
Diagnostic trouble code P2023 indicates that the powertrain control module (PCM) has detected an intermittent electrical signal from the intake manifold runner position sensor or switch on Bank 2. This means the sensor's voltage or resistance is fluctuating erratically or dropping out, preventing the PCM from accurately determining the position of the intake manifold runner flaps.
While not immediately dangerous, this code should be addressed soon. An inoperative intake manifold runner system can lead to reduced engine performance, poor fuel economy, and increased emissions.
Common symptoms
- Illuminated Check Engine Light
- Reduced engine power or sluggish acceleration
- Rough idle or hesitation during acceleration
- Decreased fuel efficiency
- Engine stalling at low speeds
Likely causes
- Loose, corroded, or damaged wiring and connectors in the sensor circuit
- Faulty intake manifold runner position sensor/switch on Bank 2
- Carbon buildup or mechanical binding in the intake manifold runner flaps
- Vacuum leak affecting the intake manifold runner actuator (if vacuum-operated)
- Faulty intake manifold runner actuator
- Failing Powertrain Control Module (PCM) (rare)
What to check before replacing parts
Visually inspect the wiring harness and connectors for the Bank 2 intake manifold runner position sensor.
Look for: Look for frayed wires, melted insulation, loose connections, or corrosion in the connector pins that could cause an intermittent signal.
Check the intake manifold runner linkage and flaps for mechanical binding.
Look for: Manually operate the linkage (if accessible) to ensure it moves freely without sticking. Carbon buildup can cause the flaps to bind, leading to erratic sensor readings.
Test the sensor's reference voltage and ground circuits using a digital multimeter.
Look for: With the key on, engine off, verify a steady 5-volt reference and a solid ground at the sensor connector. Wiggle the harness to check for intermittent drops in voltage.
Monitor the sensor's signal voltage with a scan tool or multimeter while operating the actuator.
Look for: The voltage should change smoothly as the runner flaps open and close. Erratic jumps or dropouts in the voltage reading indicate a faulty sensor or wiring issue.
Test the intake manifold runner actuator operation.
Look for: Apply vacuum (if vacuum-operated) or command the actuator via a bi-directional scan tool to ensure it fully opens and closes the runner flaps without hesitation.
This page explains the generic P2023 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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