P0086
Exhaust Valve Control Circuit High (Bank 2)
Powertrain Emission Controls Variable Valve Timing 🟡 Moderate — Fix within a week
💬
What This Actually Means
In plain language — no jargon

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.

⚡
Symptoms You May Notice
3 known symptoms for this code
Check Engine Light illuminated
Rough idle or hesitation during acceleration
Reduced fuel economy and possible power loss
🔬
Embedded Systems Insight
What the ECU/ECM is actually computing

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.

Voltage & Parameter Thresholds

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
🔧
Diagnostic & DIY Fix Guide
Check these in order — from cheapest to most complex
1
Wiring harness and connectors
Inspect Bank 2 exhaust valve control wiring for corrosion, damage, or loose connectors and repair or replace as needed.
2
Exhaust valve control solenoid
Test solenoid resistance with a multimeter; replace if reading is out of spec or wire is shorted to power.
3
Engine control module (ECM) software or hardware
After ruling out solenoid and wiring, have the ECM reprogrammed or replaced by a dealer if internal fault is confirmed.