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P code powertrain High severity

P201C Intake Manifold Runner Position Sensor/Switch Range/Performance Problem (Bank 1)

The OBD2 code P201C indicates a problem with the intake manifold runner position sensor or switch on Bank 1, specifically related to its range or performance, suggesting that the sensor is not functioning correctly or...

Definition

The OBD2 code P201C indicates a problem with the intake manifold runner position sensor or switch on Bank 1, specifically related to its range or performance, suggesting that the sensor is not functioning correctly or is out of the expected range

Common causes

  • Faulty intake manifold runner position sensor
  • Damaged or frayed wiring or connectors
  • Malfunctioning intake manifold runner control valve
  • Vacuum leaks in the intake system
  • Carbon buildup in the intake manifold
  • Faulty engine control module (ECM)
  • Incorrectly installed or damaged intake manifold
  • Issues with the throttle body or its position sensor

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
  • Fuel delivery issues
  • Ignition system faults
  • Exhaust gas recirculation (EGR) system problems
  • Other sensor malfunctions (e.g., camshaft or crankshaft position sensors)

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other trouble codes that may be present. Sometimes, multiple codes can provide more context for the issue

  2. 2. Inspect the Intake Manifold Runner System

    Visual Inspection: Check the intake manifold and associated components for any visible damage, wear, or disconnections

  3. 3. Runner Operation

    If the vehicle has a variable intake manifold, ensure that the runners are operating correctly. You may need to manually actuate the runners to see if they move freely

  4. 4. Examine the Position Sensor

    Wiring and Connectors: Inspect the wiring and connectors associated with the intake manifold runner position sensor for any signs of damage, corrosion, or loose connections

  5. 5. Sensor Functionality

    Test the sensor using a multimeter to ensure it is functioning within the manufacturer's specifications. Check for proper voltage and resistance readings

  6. 6. Check for Vacuum Leaks

    Inspect the intake manifold and surrounding hoses for any vacuum leaks that could affect the performance of the intake system

  7. 7. Inspect the Throttle Body

    Ensure that the throttle body is clean and functioning properly. A dirty or malfunctioning throttle body can affect air intake and performance

  8. 8. Check for Mechanical Issues

    Look for any mechanical issues within the engine that could affect the intake manifold runner operation, such as a stuck or broken runner

  9. 9. Clear Codes and Test Drive

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

  10. 10. Consult Technical Service Bulletins (TSBs)

    Check for any TSBs related to the P201C code for your specific vehicle make and model. Manufacturers may have known issues or recommended fixes

  11. 11. 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.Additional Notes: - Always refer to the vehicle's service manual for specific diagnostic procedures and specifications. - Safety first: Ensure the vehicle is in a safe condition to work on, and take necessary precautions when dealing with electrical components. By following these steps, you should be able to identify the cause of the P201C code and take appropriate action to resolve the issue