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P code powertrain Medium severity

P0085 Exhaust Valve Control Circuit Low (Bank 2)

The OBD2 code P0085 indicates a low voltage or malfunction in the exhaust valve control circuit for Bank 2, which can affect the operation of the exhaust valve actuator

Definition

The OBD2 code P0085 indicates a low voltage or malfunction in the exhaust valve control circuit for Bank 2, which can affect the operation of the exhaust valve actuator

Common causes

  • Faulty exhaust valve control solenoid
  • Wiring issues (shorts, opens, or corrosion)
  • Poor electrical connections
  • Failed engine control module (ECM)
  • Vacuum leaks
  • Faulty exhaust camshaft actuator
  • Low engine oil level or dirty oil
  • Faulty sensors related to the exhaust system

Common misdiagnoses

  • Faulty exhaust valve actuator
  • Wiring issues or shorts in the circuit
  • Faulty engine control module (ECM)
  • Vacuum leaks
  • Faulty camshaft or timing issues
  • Incorrectly installed or damaged intake manifold
  • Fuel pressure issues
  • Faulty sensors (e.g., camshaft position sensor)
  • Software issues in the ECM
  • Misinterpretation of related codes or symptoms

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 the 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. Pay special attention to the wiring harness for fraying, breaks, or shorts

  4. 4. Test the Exhaust Valve Control Solenoid

    Disconnect the solenoid connector and use a multimeter to check the resistance of the solenoid. Compare the reading to the manufacturer's specifications

  5. 5. If the resistance is out of spec, the solenoid may be faulty and should be replaced

  6. 6. Check the Power and Ground Supply

    With the ignition on (engine off), use a multimeter to check for voltage at the solenoid connector. You should see battery voltage

  7. 7. If there is no voltage, trace the wiring back to the ECM to find any breaks or shorts

  8. 8. Also, check the ground connection for the solenoid to ensure it is secure and functioning

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

    If the wiring and solenoid are in good condition, the issue may lie with the ECM itself. Check for any signs of damage or corrosion on the ECM connectors

  10. 10. If possible, test the ECM with a known good unit or have it reprogrammed or replaced if necessary

  11. 11. Check for Mechanical Issues

    Inspect the exhaust valve and related components for any mechanical issues that could prevent proper operation, such as carbon buildup or sticking valves

  12. 12. Ensure that the timing chain/belt is in good condition and properly aligned

  13. 13. Clear the Codes and Test Drive

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

  14. 14. Consult Technical Service Bulletins (TSBs)

    Check for any TSBs related to the P0085 code for your specific make and model, as there may be known issues or recalls that could provide additional guidance

  15. 15. Seek Professional Help

    If the issue persists after following these steps, it may be best to consult a professional mechanic or technician who has experience with your vehicle's specific make and model. By following these troubleshooting steps, you should be able to identify and resolve the issue associated with the P0085 code