P0086 - Exhaust Valve Control Solenoid Circuit High (Bank 2)
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System
Powertrain (Engine & Gearbox)
Related Fault Codes
Technical Description
P0086 is an OBD-II generic code indicating that the Engine Control Module (ECM) has detected a high voltage condition in the exhaust valve control solenoid circuit for bank 2. The ECM uses Pulse Width Modulation (PWM) to control the solenoid. A 'Circuit High' signal typically means the voltage remains at source levels (B+) when the ECM attempts to ground the circuit, or that there is a short to voltage. This malfunction prevents the variable valve timing system from adjusting the exhaust camshaft position correctly, potentially causing the engine to enter a limited performance mode (Limp mode).
Possible Causes
Faulty exhaust valve control solenoid (internal short)
Short to voltage in the wiring harness
Corroded or damaged connector pins
Internal Engine Control Module (ECM) failure
Symptoms
Recommended Solution
- Visual Inspection: Check the wiring harness and connector for the Bank 2 exhaust solenoid for signs of fraying, burns, or corrosion.
- Resistance Test: Unplug the solenoid and measure internal resistance using a multimeter. Typical values are 7-15 Ohms. An 'OL' reading indicates an open circuit.
- Voltage Check: Check for short to power on the signal wire using a voltmeter with the ignition on.
- Functional Test: Use a bidirectional scan tool to manually command the solenoid ON/OFF and listen for an audible click.
- Replacement: Replace the exhaust valve control solenoid if it fails resistance or functional tests.
Mechanic's Tip
Before replacing expensive components, always double-check wiring and connections. 80% of all sensor faults are actually due to corroded contacts or broken wires.
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