P0086

The P0086 diagnostic trouble code indicates a exhaust valve control solenoid circuit high (bank 2) condition. This code relates to the variable valve timing (VVT) system, which adjusts camshaft timing for optimal performance across the engine's RPM range. VVT issues often stem from oil quality or flow problems and can cause rough idle, poor performance, and decreased fuel economy. This guide covers everything you need to know about this topic, including common causes, step-by-step solutions, and answers to frequently asked questions.

Here are the key things to understand: Reduced engine performance. Engine stalling at idle. Rough or unstable idle. Engine rattling noise on startup. Understanding these fundamentals will help you diagnose and resolve this issue more effectively.

The most common reasons this occurs include: Clogged oil passages to VVT system. Worn timing chain or stretched chain. Faulty VVT solenoid/actuator (oil control valve). Wiring issues in VVT solenoid circuit. Identifying the root cause is the first step toward finding the right solution.

To resolve this, follow these recommended steps: Connect an OBD-II scanner and read all stored trouble codes and freeze frame data. Check engine oil level and condition; change oil if dirty or incorrect viscosity. Test the VVT solenoid (oil control valve) with a multimeter. Inspect the VVT solenoid screen/filter for debris or sludge. Monitor camshaft position sensor data using scan tool live data. If these steps do not resolve the issue, consider consulting additional resources or a qualified professional.

This article is part of our Powertrain (P) collection on OBD Codes. We provide comprehensive, up-to-date information to help you find solutions quickly.