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 the timing of the exhaust valves to optimize engine performance and emissions. A high voltage reading suggests a short to power, open circuit, or faulty solenoid, leading to improper valve timing and potential drivability issues.
1. Most Common Causes
- Short to voltage in the exhaust valve control solenoid wiring
- Faulty exhaust valve control solenoid with internal resistance out of range
- Solenoid electrical connector with corroded, bent, or loose terminals
- Open circuit or poor ground connection in the wiring
- Internal engine control module (ECM) failure
2. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine performance and power
- Rough idle or engine misfire
- Poor fuel economy
3. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect the solenoid and wiring for damage or corrosion.
Step 3: Test the solenoid resistance with a multimeter (specs vary by vehicle).
Step 4: Check for voltage at the solenoid connector with key on (should be battery voltage).
Step 5: If voltage is present and solenoid tests bad, replace solenoid; if no voltage, trace wiring for shorts or opens.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can cause reduced performance and potential engine damage. Immediate diagnosis is advised.
How much does it cost to fix?▼
The cost typically ranges from $150 to $400, including parts and labor, depending on the vehicle and shop rates.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.