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P0077 Intake Valve Control Circuit High (Bank 2)

The OBD2 code P0077 indicates a problem with the intake valve control circuit for Bank 2, specifically that the circuit is reading a high voltage or signal, which may suggest a malfunction in the valve control system

Definition

The OBD2 code P0077 indicates a problem with the intake valve control circuit for Bank 2, specifically that the circuit is reading a high voltage or signal, which may suggest a malfunction in the valve control system

Common causes

  • Faulty intake valve control solenoid
  • Wiring issues (shorts or open circuits)
  • Poor electrical connections
  • Faulty engine control module (ECM)
  • Vacuum leaks
  • Faulty intake manifold runner control (IMRC) system
  • Blocked or restricted intake passages
  • Malfunctioning sensors (e.g., throttle position sensor)

Common misdiagnoses

  • Faulty intake valve timing actuator
  • Wiring issues or short circuits
  • Faulty engine control module (ECM)
  • Vacuum leaks
  • Faulty camshaft or timing chain/belt
  • Faulty VVT (Variable Valve Timing) solenoid
  • Incorrectly installed or damaged intake manifold
  • Faulty sensors (e.g., camshaft position sensor)
  • Fuel delivery issues
  • Exhaust system restrictions

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 intake valve control solenoid for Bank 2. Look for 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 Intake 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 out of spec, it may need to 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. Ensure that the solenoid is receiving the correct voltage

  7. 7. Check the ground connection for the solenoid to ensure it is solid and free of corrosion

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

    If the wiring and solenoid are in good condition, the issue may lie with the ECM. Check for any software updates or known issues with the ECM related to the VVT system

  9. 9. Check for Mechanical Issues

    Inspect the timing chain/belt and related components to ensure they are functioning correctly. A stretched or damaged timing chain can affect valve timing

  10. 10. Check for any obstructions or issues with the intake manifold that could affect airflow and valve operation

  11. 11. Clear Codes and Test Drive

    After performing repairs or replacements, clear the trouble codes and take the vehicle for a test drive to see if the code returns

  12. 12. Consult Technical Service Bulletins (TSBs)

    Look for any TSBs related to the P0077 code for your specific make and model. Manufacturers may have issued guidance on common issues and fixes

  13. 13. Professional Diagnosis

    If the issue persists after performing the above steps, consider seeking help from a professional mechanic who has experience with your vehicle's make and model. By following these troubleshooting steps, you can systematically identify and resolve the issue associated with the P0077 code