P0086 — Exhaust Valve Control Solenoid Bank 2 – Circuit High #

Note: The code description may vary depending on the vehicle manufacturer.

• Exhaust Valve Control Solenoid Circuit High (Ford)
• Exhaust Valve Control Solenoid Bank 2 – High Voltage (GM, Chevrolet)
• Exhaust Valve Timing Control Solenoid Circuit High (Nissan, Infiniti)
• Exhaust Valve Control Solenoid Circuit High, Bank 2 (Toyota, Lexus)

Summary of DTC P0086 #

The P0086 diagnostic trouble code indicates that the Exhaust Valve Control Solenoid on Bank 2 is experiencing a high voltage condition in its control circuit. This solenoid is responsible for adjusting the timing of the exhaust valves, which is critical for optimizing engine performance and emissions. When the Engine Control Module (ECM) or Powertrain Control Module (PCM) detects an abnormally high electrical signal from this component, it triggers the code. Such a situation can compromise engine efficiency and, in some cases, lead to increased emissions or drivability issues. It’s a code that should not be ignored, as it often points to an electrical or mechanical issue within the valve timing system.

Common Symptoms for DTC P0086 #

When P0086 is present, you may notice several changes in your vehicle’s behavior. Because the exhaust valve timing is affected, performance and fuel economy can suffer. Here are some of the typical symptoms:

• Illuminated Check Engine Light
• Rough or unstable idle
• Engine hesitation or stalling, especially at low speeds
• Reduced engine performance or sluggish acceleration
• Decreased fuel efficiency
• Possible increase in exhaust emissions

Most Likely Causes for DTC P0086 #

The root causes of a P0086 code tend to be electrical, but mechanical faults are also possible. The most common reasons, ranked from most to least frequent, include:

1. Faulty exhaust valve control solenoid (Bank 2)
2. Wiring issues (short to voltage, open circuit, damaged connectors)
3. Corroded or loose electrical connections in the solenoid circuit
4. PCM/ECM malfunction (rare)
5. Mechanical blockage inside the solenoid or oil sludge restricting movement
6. Incorrect oil viscosity or low oil pressure (affecting solenoid operation)

Step-by-Step Diagnostic Process for P0086 #

Proper diagnosis is crucial to avoid unnecessary parts replacement. Here’s how a master technician would approach this code:

1. Scan for additional trouble codes to check if other related faults are present.
2. Visually inspect the exhaust valve control solenoid and its wiring harness on Bank 2 for visible damage, oil contamination, or loose connections.
3. Measure the voltage at the solenoid connector with the ignition ON; check if it matches OEM specifications.
4. Test circuit continuity and resistance using a multimeter (look for shorts to voltage or open circuits).
5. Activate the solenoid with a scan tool or directly, if possible, to confirm its function.
6. Check oil level and quality to rule out lubrication issues affecting solenoid operation.
7. If all else checks out, consider PCM/ECM testing or reprogramming as a last resort.

Possible Repairs for P0086 #

Once the cause is identified, repairs can be targeted and efficient. Here are fixes commonly linked to each cause:

• Replace the faulty exhaust valve control solenoid (Bank 2) if it fails bench or circuit testing.
• Repair or replace damaged wiring and connectors as needed.
• Clean corroded terminals and ensure tight connections.
• Flush and replace engine oil with the correct grade if oil sludge or incorrect viscosity is present.
• Update or reprogram the PCM/ECM if an internal fault is confirmed (rare).
• Clear the code and road test the vehicle to confirm the fix.

Is It Safe to Drive with Code P0086? #

Limited. While your vehicle may still run with code P0086, it’s not advisable to continue driving for extended periods. The engine may operate with reduced performance, increased emissions, or even risk internal damage if the timing system malfunctions. Prompt diagnosis and repair are recommended to prevent further issues.

Vehicles Most Commonly Affected by P0086 #

This code appears most frequently in vehicles utilizing variable valve timing and exhaust cam solenoid technology. While it can affect many makes, these models are commonly reported:

• GM (Chevrolet, GMC, Buick, Cadillac) V6 and V8 engines
• Ford and Lincoln Ecoboost, Duratec engines
• Nissan and Infiniti VQ, VK series engines
• Toyota and Lexus VVT-i equipped engines
• Some Hyundai and Kia models with Dual CVVT

Common Mistakes & Best Practices with P0086 #

Misdiagnosis is frequent with this code, especially when skipping basic electrical checks. To ensure accuracy and save time, keep in mind:

• Don’t replace the solenoid without checking the wiring first. Electrical faults are often to blame.
• Always verify oil level and quality before assuming a hardware fault.
• Use genuine or high-quality OEM parts for replacements.
• Clear codes and retest after repairs to confirm resolution.
• Refer to your vehicle’s OEM service manual for specific test values.

Quick FAQs for DTC P0086 #

Still have questions? Here are quick answers to the most common concerns:

• Q: Can a bad exhaust valve control solenoid cause long-term engine damage?
  A: Yes, if ignored, improper valve timing can cause poor performance, higher emissions, and potential internal engine issues.
• Q: Do I need special tools to diagnose P0086?
  A: A standard scan tool, digital multimeter, and basic hand tools are usually sufficient. OEM-specific data can speed up diagnosis.