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P0086 Exhaust Valve Control Circuit High (Bank 2)

The OBD2 code P0086 indicates a problem with the exhaust valve control circuit for Bank 2, specifically that the circuit is reading a high voltage or signal, which may suggest a malfunction in the exhaust valve actuator...

Definition

The OBD2 code P0086 indicates a problem with the exhaust valve control circuit for Bank 2, specifically that the circuit is reading a high voltage or signal, which may suggest a malfunction in the exhaust valve actuator or related wiring

Common causes

  • Faulty exhaust valve control solenoid
  • Wiring issues (shorts, open circuits, or damaged connectors)
  • Faulty engine control module (ECM)
  • Vacuum leaks
  • Faulty exhaust camshaft or timing issues
  • Blocked or restricted exhaust system
  • Faulty sensors (e.g., camshaft position sensor)

Common misdiagnoses

  • Faulty camshaft position sensor
  • Faulty crankshaft position sensor
  • Vacuum leaks
  • Fuel pressure issues
  • Ignition system problems
  • Wiring or connector issues
  • Faulty engine control module (ECM)
  • Timing chain or belt problems
  • Exhaust system blockages
  • Other valve timing issues

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other trouble codes that may be present. This can provide more context and help identify related issues

  2. 2. Inspect Wiring and Connectors

    Visually inspect the wiring and connectors associated with the exhaust valve control solenoid for any signs of damage, corrosion, or loose connections

  3. 3. Ensure that the connectors are securely attached and that there are no broken wires

  4. 4. Test the Exhaust Valve Control Solenoid

    Disconnect the solenoid and test its resistance with a multimeter. Compare the reading to the manufacturer's specifications

  5. 5. If the solenoid is faulty, it may need to be replaced

  6. 6. Check Power and Ground

    With the ignition on (engine off), use a multimeter to check for power at the solenoid connector. Ensure that the voltage is within the specified range

  7. 7. Check for a good ground connection as well. If there is no power or ground, trace the circuit back to the PCM (Powertrain Control Module) to identify the issue

  8. 8. Inspect the PCM

    If the wiring and solenoid are in good condition, the issue may lie with the PCM. Check for any software updates or recalls related to the PCM

  9. 9. In some cases, reprogramming or replacing the PCM may be necessary

  10. 10. Check for Mechanical Issues

    Inspect the VVT system for any mechanical issues, such as a stuck or malfunctioning exhaust valve or timing chain/belt problems

  11. 11. Ensure that the oil supply to the VVT system is adequate, as low oil pressure can affect its operation

  12. 12. Clear Codes and Test Drive

    After performing repairs or replacements, clear the trouble codes using the OBD-II scanner

  13. 13. Take the vehicle for a test drive to see if the code returns. Monitor the engine performance and any related symptoms

  14. 14. Consult Repair Manual

    Refer to the vehicle's service manual for specific diagnostic procedures, wiring diagrams, and specifications related to the exhaust valve control circuit

  15. 15. Seek Professional Help

    If the issue persists after following these steps, consider seeking assistance from a qualified mechanic or technician who has experience with your specific vehicle make and model. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the P0086 code