Intake Manifold Runner Position Sensor/Switch Circuit Range/Performance Bank 1
The Powertrain Control Module (PCM) detected that the intake manifold runner control (IMRC) position sensor or switch for Bank 1 is sending a signal that falls outside the expected range or performance parameters. This typically means the intake manifold flaps are not achieving the commanded position, often due to mechanical binding or a faulty sensor.
While the vehicle is usually safe to drive, prolonged driving with this code can lead to reduced fuel economy, poor engine performance, and potential carbon buildup issues. It should be diagnosed and repaired soon to restore optimal engine efficiency.
Common symptoms
- Illuminated Check Engine Light
- Rough idle or engine hesitation
- Reduced engine power, especially at lower RPMs
- Decreased fuel economy
- Poor acceleration or engine surging
Likely causes
- Carbon buildup causing the intake manifold runner flaps to bind or stick
- Faulty intake manifold runner position sensor
- Defective intake manifold runner control actuator or motor
- Damaged, corroded, or loose wiring and connectors in the sensor circuit
- Vacuum leak in the control system (if vacuum actuated)
- Mechanical failure of the intake manifold linkage
What to check before replacing parts
Scan for codes and record freeze frame data.
Look for: Verify P2015 is the primary code and check for any related IMRC or vacuum leak codes that might indicate a broader system issue.
Visually inspect the intake manifold runner linkage and actuator.
Look for: Look for disconnected, broken, or binding linkage arms, as well as damaged wiring or loose connectors at the position sensor and actuator.
Manually actuate the intake manifold runner linkage (if accessible).
Look for: The linkage should move smoothly without excessive resistance or binding; if it sticks, carbon buildup or mechanical failure inside the manifold is likely.
Test the intake manifold runner position sensor using a multimeter.
Look for: Check for a smooth, continuous change in voltage or resistance as the linkage is moved; dropouts or out-of-range readings indicate a faulty sensor.
Command the IMRC actuator using a bi-directional scan tool.
Look for: Observe if the actuator moves the linkage to the commanded positions and verify that the sensor feedback matches the commanded state.
This page explains the generic P2015 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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