Intake Manifold Runner Position Sensor/Switch Circuit Range/Performance Bank 1
The P2015 code indicates the intake manifold runner control (IMRC) system is not operating within expected parameters on Bank 1. This system adjusts intake runner length to optimize engine performance across different RPM ranges, and when it malfunctions, the engine loses efficiency and power.
What You Might Notice
- Check Engine Light illuminated
- Reduced engine power and acceleration
- Occasional misfires or rough idle
- Poor fuel economy
- Hesitation during acceleration
Most Common Causes
- 1
Sticking or faulty IMRC valve
The intake manifold runner control valve becomes stuck in one position or fails to respond to control signals, preventing proper airflow adjustment. This is the most common cause of P2015 codes.
- 2
Faulty IMRC actuator or position sensor
The actuator that moves the IMRC valve or the sensor that monitors its position malfunctions, causing incorrect feedback to the PCM and preventing proper valve operation.
- 3
Sticking or faulty throttle body/plates
Carbon buildup or mechanical failure in the throttle body prevents smooth operation and affects the IMRC system's ability to function correctly.
- 4
Faulty Powertrain Control Module (PCM)
The engine control computer may have a software glitch or hardware failure affecting IMRC control, though this is rare and typically confirmed after other components are tested.
How to Diagnose It
- 1
Check Sticking or faulty IMRC valve — The intake manifold runner control valve becomes stuck in one position or fails to respond to control signals, preventing proper airflow adjustment. This is the most common cause of P2015 codes.
- 2
Check Faulty IMRC actuator or position sensor — The actuator that moves the IMRC valve or the sensor that monitors its position malfunctions, causing incorrect feedback to the PCM and preventing proper valve operation.
- 3
Check Sticking or faulty throttle body/plates — Carbon buildup or mechanical failure in the throttle body prevents smooth operation and affects the IMRC system's ability to function correctly.
- 4
Check Faulty Powertrain Control Module (PCM) — The engine control computer may have a software glitch or hardware failure affecting IMRC control, though this is rare and typically confirmed after other components are tested.
How to Fix It
- 1
Clean or replace IMRC valve
Remove and inspect the intake manifold runner control valve for carbon buildup or damage. Clean with appropriate solvent if possible, or replace if faulty. This often resolves the code without replacing other components.
- 2
Replace IMRC actuator
Test the IMRC actuator with a diagnostic scanner to confirm it responds to commands. If it does not move or respond, replace the actuator assembly to restore proper valve control.
- 3
Replace IMRC position sensor
Test the IMRC position sensor using a multimeter to verify it sends proper feedback signals. If resistance values are out of specification, replace the sensor to restore PCM feedback.
- 4
Clean throttle body
Remove and clean the throttle body with carburetor cleaner to remove carbon deposits that may be restricting airflow or interfering with the IMRC system operation.
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