WOMS
P code powertrain High severity

P2018 Intake Manifold Runner Position Sensor/Switch Circuit Intermittent Bank 1

The OBD2 code P2018 indicates a problem with the intake manifold runner position sensor or switch circuit for Bank 1, specifically that the circuit is experiencing intermittent issues, which may affect the performance...

Definition

The OBD2 code P2018 indicates a problem with the intake manifold runner position sensor or switch circuit for Bank 1, specifically that the circuit is experiencing intermittent issues, which may affect the performance of the intake manifold's variable runner system

Common causes

  • Faulty intake manifold runner position sensor
  • Damaged wiring or connectors
  • Vacuum leaks
  • Faulty intake manifold
  • Malfunctioning engine control module (ECM)
  • Carbon buildup in the intake manifold
  • Poor electrical connections

Common misdiagnoses

  • Faulty intake manifold runner control valve
  • Vacuum leaks
  • Throttle body issues
  • Mass air flow sensor problems
  • Engine control module (ECM) issues
  • Wiring or connector problems
  • Faulty fuel injectors
  • EGR system malfunctions
  • Intake manifold gasket leaks
  • Sensor calibration errors

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other trouble codes that may be present. Addressing all related codes can help pinpoint the issue

  2. 2. Inspect the Wiring and Connectors

    Visual Inspection: Check the wiring harness and connectors associated with the intake manifold runner position sensor. Look for signs of damage, corrosion, or loose connections

  3. 3. Connector Condition

    Ensure that the connectors are securely attached and free of dirt or moisture

  4. 4. Test the Intake Manifold Runner Position Sensor

    Resistance Check: Use a multimeter to measure the resistance of the sensor. Compare the readings to the specifications in the vehicle’s service manual

  5. 5. Voltage Check

    With the ignition on (engine off), check the voltage at the sensor connector. Ensure it is within the specified range

  6. 6. Inspect the Intake Manifold

    Physical Inspection: Check the intake manifold for any obstructions or damage that could affect the operation of the runner control

  7. 7. Runner Operation

    If applicable, manually operate the intake manifold runner (if it has a mechanical linkage) to ensure it moves freely

  8. 8. Check for Vacuum Leaks

    Inspect the intake system for any vacuum leaks that could affect the performance of the intake manifold runner system

  9. 9. Test the Engine Control Module (ECM)

    If all other components check out, there may be an issue with the ECM. Ensure that the ECM is functioning correctly and that it is receiving the proper signals from the sensor

  10. 10. Clear Codes and Test Drive

    After performing the checks and repairs, clear the trouble codes using the OBD-II scanner. Take the vehicle for a test drive to see if the code returns

  11. 11. Consult Technical Service Bulletins (TSBs)

    Check for any TSBs related to the P2018 code for your specific vehicle make and model. Manufacturers may have issued updates or fixes for known issues

  12. 12. Professional Diagnosis

    If the issue persists after performing the above steps, consider seeking help from a professional mechanic or technician who has experience with your vehicle's make and model. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the P2018 code