P3462 indicates that the powertrain control module has detected a performance problem in the exhaust valve control circuit for cylinder 8, typically the solenoid or actuator that manages cylinder deactivation or variable valve operation on that cylinder. The PCM compares the commanded state against feedback and sets the code when the exhaust valve control side does not perform as expected.
The solenoid or deactivation lifter oil manifold (VLOM) component for cylinder 8 can stick, leak, or fail electrically, so the exhaust valve mechanism does not respond correctly to PCM commands.
Open, short-to-ground, short-to-power, or high-resistance conditions in the harness and connectors between the solenoid and PCM can cause a performance or circuit fault.
Many exhaust valve control systems rely on engine oil pressure; low level, incorrect viscosity, sludge, or poor oil condition can prevent proper solenoid/lifter operation.
A stuck, collapsed, or failed deactivation lifter or related valvetrain hardware on cylinder 8 can produce the same performance fault because valve motion does not match the expected feedback.
A failed control output inside the PCM is possible but uncommon; it should only be considered after the solenoid, wiring, oil system, and mechanical components are verified good.
It can be. It may cause a misfire, rough running, and potential catalyst damage if ignored, though the vehicle is often still drivable cautiously until diagnosed.
Usually no. PCM failure is an uncommon cause of this code. Most repairs involve the solenoid, wiring, oil condition/pressure, or mechanical valvetrain parts. Replace the PCM only after those are verified.
Yes. Low oil pressure or degraded, sludged oil can prevent the exhaust valve control solenoid and related lifter from operating correctly.
Bank assignment for cylinder 8 depends on the specific engine design; consult the manufacturer’s service information for cylinder numbering and bank layout.