Exhaust Valve Control Circuit High (Bank 2)
The engine control computer detected the exhaust valve control circuit on Bank 2 is sending a signal that's too high, like a stuck accelerator pedal signal. This prevents proper exhaust valve timing and can harm engine performance and emissions.
The ECM monitors the voltage signal from the exhaust valve control solenoid circuit on Bank 2, expecting it to vary within a normal operating range as it controls variable valve timing. When the signal voltage remains abnormally high for extended periods, the ECM detects a circuit fault and sets the code.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Control Circuit Voltage | 0.5–4.5 volts (varies with command) | Sustained above 4.8 volts or shorted high |
| Solenoid Resistance | 6–14 ohms | Below 4 ohms or open circuit |
Code P0086 is a moderate fault. You can generally drive to a workshop, but avoid long trips or high-load driving (motorway, uphill towing) until it is diagnosed. If the code keeps returning after clearing, or if you notice the symptoms listed above worsening, do not delay professional diagnosis. Many moderate codes have multiple possible root causes — a mechanic with live OBD data can identify the exact fault more efficiently than part-by-part trial and error.
Once the fault is repaired, P0086 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.