P0086
UniversalExhaust Valve Control Circuit High (Bank 2) indicates that the Powertrain Control Module (PCM) has detected an excessively high voltage within the control circuit of the exhaust valve for Bank 2. This usually points to an electrical fault within the variable valve timing or lift system.
Medium SeverityThe P0086 code signifies that the vehicle's computer has detected an electrical fault, specifically a high voltage signal, in the circuit controlling the exhaust valve on Bank 2. This electrical issue can prevent the variable valve timing system from adjusting the exhaust valves properly, potentially affecting engine performance and fuel efficiency.
⚠️ Before You Begin (Safety First)
Always ensure the vehicle is turned off and the battery is disconnected before performing any electrical diagnostic or repair work. Be cautious around hot engine components and moving parts. Always use appropriate personal protective equipment.
Common Symptoms
- Check Engine Light illuminated
- Rough idle
- Reduced engine performance
- Decreased fuel economy
- Engine hesitation or stalling
- Increased emissions
Common Causes
- Faulty exhaust variable valve timing (VVT) solenoid or actuator on Bank 2
- Open or short in the VVT solenoid control circuit, leading to high voltage
- Corroded, loose, or damaged electrical connectors or wiring
- Faulty Powertrain Control Module (PCM), though less common
- Low engine oil level or incorrect oil viscosity (can affect VVT operation and trigger electrical faults)
Frequently reported on: Ford F-150 (V8 models, 2011-2014), Chevrolet Silverado (V8 models, 2007-2013), Nissan Altima (V6 models, 2007-2012), Honda Pilot (V6 models, 2009-2015)
Diagnostic Steps
- Use an OBD-II scanner to confirm the P0086 code and check for any other related codes. Clear the code and test drive the vehicle to see if it returns.
- Locate the exhaust VVT solenoid on Bank 2 (the side of the engine without cylinder #1).
- Inspect the wiring harness and electrical connector for the VVT solenoid for any visible signs of damage, fraying, corrosion, or looseness.
- Check the engine oil level and condition; ensure it meets manufacturer specifications and is not dirty or low, as VVT systems rely on proper oil pressure.
- Using a multimeter, test the VVT solenoid's circuit for proper voltage and ground. Also, test the resistance of the solenoid itself to ensure it is within specified limits (consult a service manual).
- If the solenoid is suspected to be faulty and is accessible, remove and inspect it for any clogging or damage, and consider replacing it if tests confirm a fault.
👨🔧 When to Call a Professional
If the issue persists after basic checks, or if you are uncomfortable diagnosing electrical circuits, it is highly recommended to consult a certified mechanic, especially if engine performance is significantly impacted or the Check Engine Light returns immediately after clearing the code.
Commonly Asked Questions
What does 'Bank 2' mean for a P0086 code?
'Bank 2' refers to the side of the engine that does NOT contain cylinder #1. On a V6 or V8 engine, this means there are two cylinder banks, and Bank 2 is the one with the high circuit voltage issue for the exhaust valve.
Can I drive with a P0086 code?
While you might be able to drive, it's not recommended for extended periods. The engine's performance and fuel economy will likely be reduced, and prolonged driving could lead to further damage to engine components or increased emissions.
Is low engine oil related to P0086?
Yes, the Variable Valve Timing (VVT) system relies on clean engine oil at the correct pressure to operate properly. Low or dirty oil can prevent the VVT solenoid from functioning correctly, potentially triggering electrical circuit codes like P0086.
How do I locate the exhaust VVT solenoid on Bank 2?
The VVT solenoids are typically located on the cylinder head. For Bank 2, you'll need to identify the cylinder bank opposite cylinder #1 and then look for the solenoid near the exhaust camshaft. Consulting your vehicle's service manual or an online diagram is best for exact placement.
Do I need special tools to fix P0086?
A basic OBD-II scanner to read and clear codes, a multimeter for electrical checks, and standard hand tools (wrenches, sockets) are usually sufficient for diagnosis and replacement of the VVT solenoid.