The P0086 trouble code is an OBD-II diagnostic code that indicates a problem with the exhaust valve control solenoid circuit on Bank 2 of the engine. This code is triggered when the Engine Control Module (ECM) detects a high voltage reading in the exhaust valve control solenoid circuit, which can lead to various performance issues in the vehicle. The exhaust valve control solenoid plays a critical role in regulating exhaust flow and managing emissions, making it essential for optimal engine performance.
| P0086 Code Meaning | P0086 Code Common Causes |
|---|---|
| Exhaust Valve Control Solenoid Circuit High (Bank 2) | Short circuit in the solenoid wiring |
| High voltage detected in the solenoid circuit | Open circuit in the solenoid wiring |
| Failure of the exhaust valve control solenoid | Corroded or damaged connections |
| ECM malfunction | High resistance in the circuit |
| Wiring harness damage or chafing | Faulty relay (if equipped) |
Symptoms of P0086 Code
When dealing with a P0086 code, vehicle owners may experience several symptoms, including:
- Check Engine Light: The most common indication is that the check engine light will illuminate on the dashboard.
- Poor Engine Performance: Drivers may notice a decrease in acceleration and overall engine performance.
- Reduced Fuel Economy: The vehicle may consume more fuel than usual due to inefficient operation.
- Engine Stalling: In severe cases, the engine may stall or fail to start altogether.
- Limp Mode Activation: The vehicle might enter a failsafe mode to prevent further damage, limiting its performance.
Technical Explanation of P0086 Code
The P0086 code specifically refers to an issue with the exhaust valve control solenoid circuit for Bank 2. In engines with multiple banks (like V6 or V8 configurations), Bank 2 typically refers to one side of the engine. The exhaust valve control solenoid regulates exhaust flow and assists in controlling emissions. When the ECM detects that the voltage in this circuit is higher than expected, it triggers the P0086 code.
Step-by-Step Diagnosis of P0086 Code
Diagnosing a P0086 code requires a systematic approach:
- Initial Inspection: Begin with a visual inspection of wiring and connectors associated with the exhaust valve control solenoid. Look for signs of damage, corrosion, or loose connections.
- Scan Tool Usage: Connect an OBD-II scanner to retrieve trouble codes and freeze frame data. This information can provide context about when and how the code was triggered.
- Voltage and Resistance Testing: Use a multimeter to measure voltage and resistance in the exhaust valve control solenoid circuit. Compare these readings against manufacturer specifications.
- Solenoid Functionality Check: Test the operation of the exhaust valve control solenoid itself by applying direct power to see if it opens and closes as expected.
- ECM Assessment: If all components appear functional, check the ECM for faults or reprogramming needs.
Solution Methods for P0086 Code
Resolving a P0086 trouble code involves several potential fixes:
Inspect Wiring and Connections
- Symptoms: Corroded or damaged wiring can lead to incorrect voltage readings.
- Solution Steps:
- Disconnect battery power.
- Inspect wiring harness for shorts or breaks.
- Repair or replace damaged wires as necessary.
- Cost Estimate: Depending on labor rates and parts needed, repairs can range from $50 to $200.
Replace Exhaust Valve Control Solenoid
- Symptoms: If testing reveals that the solenoid is faulty, it must be replaced.
- Solution Steps:
- Disconnect battery power.
- Remove old solenoid from its mounting location.
- Install new solenoid and reconnect all wiring.
- Cost Estimate: Replacement parts typically cost between $100 and $300, including labor.
ECM Replacement or Reprogramming
- Symptoms: If no other issues are found, a malfunctioning ECM may be at fault.
- Solution Steps:
- Disconnect battery and remove ECM.
- Install new or reprogrammed ECM.
- Cost Estimate: ECM replacement can be expensive, ranging from $200 to over $1000 depending on vehicle make/model.
Warnings and Recommendations
- Always disconnect battery power before working on electrical components to avoid short circuits or shocks.
- If you are not comfortable performing these diagnostics or repairs yourself, seek professional assistance from a certified mechanic.
- Regularly check your vehicle’s maintenance schedule to prevent issues related to electrical components from arising.
Closing Paragraph
The P0086 trouble code can indicate significant issues within your vehicle’s exhaust system management. By understanding its meaning, symptoms, and potential solutions, vehicle owners and DIY mechanics can effectively diagnose and address this issue. Regular maintenance and prompt attention to warning signs can help ensure optimal performance and longevity of your vehicle’s engine system.
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. - How serious is the P0086 code?
While not immediately dangerous, it can lead to poor engine performance and reduced fuel efficiency if left unaddressed. - Can I drive my car with a P0086 code?
It is advisable not to drive your car until this issue is resolved, as it may cause further damage. - What are common causes of P0086?
Common causes include short circuits in wiring, faulty exhaust valve control solenoids, and ECM failures. - How do I fix error code P0086?
Fixing this error typically involves inspecting wiring, replacing faulty components like the solenoid or ECM. - Will clearing the code fix my car?
No, simply clearing the code will not fix underlying issues; proper diagnosis and repair are necessary. - Can I repair this myself?
If you have basic mechanical skills and tools, you can attempt repairs; otherwise, consult a professional. - What tools do I need for diagnosing P0086?
A multimeter for electrical testing and an OBD-II scanner for reading codes are essential tools for diagnosis.