The P0086 trouble code is a diagnostic trouble code (DTC) that indicates a fault in the Exhaust Valve Control Solenoid Circuit for Bank 2. This code is part of the OBD-II system, which monitors various components of a vehicle’s engine and emissions systems. When the Engine Control Module (ECM) detects a high voltage condition in the exhaust valve control solenoid circuit, it triggers the P0086 code. This can lead to reduced engine performance, poor fuel economy, and other related issues.
| P0086 Code Meaning | P0086 Code Common Causes |
|---|---|
| Exhaust Valve Control Solenoid Circuit High (Bank 2) | Faulty exhaust valve control solenoid |
| High voltage detected in the solenoid circuit | Wiring issues (shorts or opens) |
| ECM unable to control variable valve timing | Corroded or damaged connectors |
| Potential failure of the ECM itself | Low engine oil level or pressure |
| Vehicle operating in failsafe mode | Faulty variable valve timing system components |
Symptoms of P0086 Code
Understanding the symptoms associated with the P0086 code is crucial for vehicle owners and DIY mechanics. Common symptoms include:
- Check Engine Light: The most immediate indication of a problem is the illumination of the check engine light on the dashboard.
- Poor Acceleration: Drivers may notice a significant decrease in acceleration performance, making it difficult to merge onto highways or overtake other vehicles.
- Decreased Fuel Economy: A malfunctioning exhaust valve control solenoid can lead to inefficient engine performance, resulting in lower miles per gallon.
- Engine Stalling: In severe cases, the engine may stall or have difficulty starting due to improper airflow and fuel mixture.
- Rough Idle: The vehicle may experience an uneven or rough idle when stopped.
Technical Explanation of P0086 Code
The P0086 code specifically refers to an issue with the exhaust valve control solenoid circuit on Bank 2 of the engine. In vehicles equipped with Variable Valve Timing (VVT), this solenoid plays a critical role in regulating exhaust flow and optimizing engine performance.
When the ECM detects that the voltage in this circuit is higher than expected, it triggers the P0086 code. This can occur due to several reasons:
- An open or short circuit in the wiring harness.
- A faulty exhaust valve control solenoid that fails to operate correctly.
- Corrosion or damage to electrical connectors affecting signal transmission.
- Low oil levels that prevent proper operation of VVT components.
Step-by-Step Diagnosis
Diagnosing a P0086 code involves methodical checks to identify the root cause. Follow these steps:
- Scan for Codes: Use an OBD-II scanner to confirm that P0086 is present and check for any related codes that may provide additional context.
- Inspect Wiring and Connectors: Visually inspect the wiring harness and connectors associated with the exhaust valve control solenoid for any signs of damage, corrosion, or loose connections.
- Test Voltage at Solenoid: Using a multimeter, measure the voltage at the exhaust valve control solenoid while the engine is running. Compare this reading with manufacturer specifications.
- Check Solenoid Operation: If possible, apply direct power to the solenoid to see if it activates properly. If it does not operate as expected, it may need replacement.
- Evaluate Engine Oil Level: Ensure that engine oil levels are adequate, as low oil can affect VVT operation.
- ECM Testing: If all other components check out, consider testing or replacing the ECM as a last resort.
Solution Methods
Resolving a P0086 trouble code can involve several approaches depending on what diagnosis reveals:
- Replace Faulty Solenoid: If testing shows that the exhaust valve control solenoid is defective, replacing it is often necessary.
- Repair Wiring Issues: If there are damaged wires or connectors, repairing or replacing these components should restore proper function.
- ECM Replacement/Repair: In cases where the ECM is found to be faulty after all other components have been ruled out, professional assistance may be required for replacement or reprogramming.
- Regular Maintenance Checks: Ensure regular maintenance on your vehicle’s oil levels and VVT system components to prevent future occurrences of this code.
Cost Estimates
The cost for diagnosing and repairing a P0086 code can vary widely based on location and vehicle make/model:
- Diagnostic Fee: Typically ranges from $100 to $150 at most repair shops.
- Exhaust Valve Control Solenoid Replacement: Parts can range from $50 to $200, with labor costs adding an additional $100 to $200 depending on accessibility.
- Wiring Repairs: Costs can vary significantly based on damage severity but expect anywhere from $50 to $300 depending on labor rates and parts required.
Warnings and Recommendations
When dealing with a P0086 trouble code:
- Do Not Ignore Symptoms: Ignoring warning lights and symptoms can lead to more severe engine problems down the line.
- Seek Professional Help if Needed: If you are not comfortable performing diagnostics or repairs yourself, seek assistance from a certified mechanic who has experience with your specific vehicle make and model.
- Follow Manufacturer Guidelines: Always refer to your vehicle’s service manual for specific diagnostic procedures and specifications related to your model.
Frequently Asked Questions About P0086
- What does error code P0086 mean?
P0086 indicates that there is a high voltage reading in the exhaust valve control solenoid circuit for Bank 2. - Can I drive my car with a P0086 code?
While you can drive your car, it is advisable to address this issue promptly as it can lead to decreased performance and fuel efficiency. - What are common causes of P0086?
Common causes include faulty solenoids, wiring issues, corroded connectors, and low engine oil levels. - How serious is code P0086?
This code can lead to significant performance issues if not addressed; thus, it should be diagnosed and repaired as soon as possible. - What tools do I need to diagnose P0086?
You will need an OBD-II scanner, multimeter, and basic hand tools for inspections and repairs. - Can I fix error code P0086 myself?
If you have basic automotive knowledge and tools, you may be able to diagnose and fix this issue; however, professional help is recommended if unsure. - What happens if I ignore this trouble code?
Ignoring this trouble code can lead to further engine damage and increased repair costs over time. - Is there a risk of driving with this error?
Driving with this error can result in reduced power and efficiency; caution is advised until repairs are made.
In conclusion, understanding and addressing a P0086 trouble code promptly is essential for maintaining your vehicle’s performance. By following proper diagnostic procedures and solutions outlined above, vehicle owners and DIY mechanics can effectively manage this issue while ensuring their vehicles operate efficiently.