What does Error Code P0084 mean?
Moderate Issue
DTC Code P0084 indicates an issue with the Exhaust Valve Control Solenoid Circuit on Bank 2. This code is triggered when the ECM detects a malfunction in the control of the exhaust valve timing, which is adjusted by ON/OFF pulse duty signals.
What are the symptoms of Error Code P0084?
- Engine Light ON: The check engine light or service engine soon warning light illuminates, indicating an issue with the exhaust valve control solenoid circuit in bank 2.
- Poor Engine Performance: The vehicle may experience reduced power or acceleration due to improper exhaust valve timing.
- Rough Idling: The engine may idle roughly or inconsistently, which can be linked to the malfunctioning exhaust valve control solenoid.
- Increased Emissions: There may be an increase in emissions due to inefficient exhaust valve operation, potentially leading to failed emissions tests.
What causes Error Code P0084?
- The intake valve control solenoid valve may be faulty, leading to improper operation of the exhaust valve control solenoid circuit.
- An open or shorted harness in the intake valve control solenoid can disrupt the electrical flow, causing the error code.
- Poor electrical connections in the intake valve control solenoid circuit can result in intermittent or failed communication, triggering the code.
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How to fix Error Code P0084?
- Initial Inspection: Visually inspect the exhaust valve control solenoid and its wiring for any signs of damage, corrosion, or disconnection. Ensure all connectors are securely attached.
- Check Power Supply: Using a multimeter, verify that the solenoid is receiving the correct voltage from the power supply. Compare the readings with the manufacturer's specifications.
- Test Solenoid Resistance: Measure the resistance of the exhaust valve control solenoid. Ensure it falls within the specified range provided by the manufacturer. An out-of-range reading indicates a faulty solenoid.
- Inspect Control Circuit: Examine the control circuit for any open or short circuits. Use a wiring diagram to trace the circuit and ensure continuity.
- ECU Diagnostic: Check the Engine Control Unit (ECU) for any additional fault codes that may indicate a broader issue. Clear the codes and perform a test drive to see if the code reappears.
- Solenoid Replacement: If all tests indicate a faulty solenoid, replace the exhaust valve control solenoid. Re-test the system to confirm the issue is resolved.