Code P3459 indicates that the engine control module has detected a voltage signal below the normal threshold in the control circuit for the cylinder 8 intake valve deactivation solenoid. This prevents the system from correctly disabling cylinder 8 to improve fuel efficiency.
An internal electrical short or failure within the cylinder 8 intake valve solenoid.
Frayed, rubbed, or shorted wires in the circuit leading to the solenoid.
Corrosion or contamination at the solenoid electrical connector causing poor contact or a voltage drop.
A blown fuse in the circuit providing power to the cylinder deactivation system.
An internal failure of the control module's driver circuit for the deactivation valve.
No, this is an electrical circuit code referring to the control system for the valves, not a mechanical failure of the cylinder itself.
The vehicle is generally drivable, but it will not be able to deactivate cylinder 8, leading to lower fuel efficiency and potentially higher emissions.
No. The PCM is the least likely cause of P3459; the fault is almost always found in the solenoid, the wiring, or the connectors.