P3405 signals that the engine control module has detected an open circuit in the exhaust valve control circuit for cylinder 1. This prevents the module from commanding the exhaust valve actuator, which can affect valve timing and engine performance.
A break, chafing, or corrosion in the wiring between the control module and the exhaust valve actuator creates an open circuit.
Internal failure of the solenoid or actuator prevents the circuit from completing, even if wiring is intact.
Oxidation, moisture, or a poorly seated connector at the actuator or module interrupts continuity.
Rarely, the output driver inside the engine control module for this cylinder may be defective, causing an apparent open.
In most cases the fault is in the wiring, connector, or the exhaust valve actuator itself; a control module failure is uncommon and should be considered only after those items are ruled out.
Driving is possible but may result in rough idle, loss of power, higher emissions, and potential catalytic converter damage if the condition persists.
Yes, the exhaust valve control solenoid is a type of VVT solenoid that specifically manages exhaust valve timing for the indicated cylinder.
Use a scan tool to erase the code after the repair is completed, then run the engine to confirm the code does not return.