P0084 – Exhaust Valve Control Solenoid Circuit Intermittent (Bank 2)

Description

The P0084 trouble code indicates that the Engine Control Module (ECM) has detected an intermittent problem in the exhaust valve control solenoid circuit on Bank 2. The exhaust VVT solenoid controls oil flow to the variable valve timing system, which adjusts exhaust valve timing for improved engine performance and efficiency.

Common Causes

• Faulty exhaust VVT control solenoid.
• Loose or damaged electrical connector.
• Broken or damaged wiring.
• Corrosion at terminals.
• Oil contamination affecting solenoid operation.
• Faulty ECM (rare).

Symptoms

• Check Engine Light ON.
• Intermittent loss of engine power.
• Rough idle.
• Poor acceleration.
• Unstable engine performance.

Electrical Wiring Diagram

              Battery (+12V)
                    |
                 Fuse / Relay
                    |
                    |
        Exhaust VVT Solenoid
              (Bank 2)
                    |
                    |
        Control Signal Wire
                    |
                    |
                 ECM / PCM


     Possible Fault Areas:
     - Connector
     - Wiring Harness
     - Solenoid Coil

OBD Spark Diagnosis

• Scan vehicle and confirm DTC P0084.
• Check freeze frame and live data.
• Inspect exhaust VVT solenoid connector.
• Test wiring continuity and intermittent faults.
• Measure solenoid resistance.
• Clear code and perform a road test.

Estimated Repair Cost

Typical repair cost ranges from $30 - $300, depending on wiring repair or exhaust VVT solenoid replacement.

Severity

Moderate. The vehicle may operate normally at times, but the fault can affect engine performance and fuel efficiency.

Recommended Fix

Repair damaged wiring or connectors, replace the exhaust VVT solenoid if faulty, check engine oil condition, clear the trouble code, and verify the repair with an OBD scanner.