The P3464 code indicates that the engine control module has detected a voltage signal higher than the normal operating range in the exhaust valve control circuit for cylinder 8. This typically points to an open circuit or a short to power within the actuator circuit.
The solenoid or actuator for cylinder 8 has failed internally, creating an open circuit.
Frayed, burnt, or broken wires in the circuit leading to cylinder 8, causing a loss of connection.
Poor electrical contact at the actuator plug due to corrosion or a loose fit, resulting in high resistance.
A break or high resistance in the grounding circuit associated with the exhaust valve control.
An internal fault in the engine control module's driver circuit for cylinder 8.
Not necessarily. P3464 is an electrical circuit code, meaning the computer cannot communicate correctly with the actuator; the valve itself may still be moving or it may be stuck due to the lack of electrical signal.
No. It is very rare for the PCM to be the cause of this code. Most cases are resolved by replacing the actuator or repairing the wiring harness.
The vehicle is usually drivable, but it may operate in a degraded performance mode, leading to poor fuel economy and increased emissions.