P0086: Exhaust Valve Control Solenoid Circuit High (Bank 2)
The P0086 code indicates that the Engine Control Module (ECM) has detected a high voltage condition in the exhaust valve control solenoid circuit for Bank 2. This solenoid is part of the variable valve timing (VVT) system, which adjusts exhaust valve timing to optimize engine performance and emissions. A high voltage signal suggests a short to power, open circuit, or faulty solenoid, potentially causing drivability issues and increased emissions.
01. Most Common Causes
- Faulty exhaust valve control solenoid (Bank 2)
- Short to power in the solenoid circuit wiring
- Open or high resistance in the solenoid circuit
- Corroded or damaged connector at the solenoid
- Failed ECM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Rough idle or engine misfire
- Reduced engine power or hesitation
- Poor fuel economy
- Failed emissions test
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data. Clear codes and test drive to see if P0086 returns.
Step 2: Visually inspect the exhaust valve control solenoid connector and wiring for damage, corrosion, or shorts.
Step 3: Use a multimeter to check the solenoid resistance (typically 6-12 ohms). Compare to manufacturer specs.
Step 4: Check for voltage at the solenoid connector with key on engine off. Should be battery voltage on one pin; if not, check fuses and relay.
Step 5: If wiring and solenoid test OK, suspect a faulty ECM. Perform ECM tests or consult a professional.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances. The issue can cause poor engine performance, increased emissions, and potential damage to the VVT system. Have it diagnosed promptly.
How much does it cost to fix?▼
Repair costs vary. Replacing the solenoid typically costs $150-$300 including parts and labor. Wiring repairs may be $100-$200. ECM replacement is more expensive, up to $1000.