What does it mean?
P3405 is a Powertrain (engine, transmission, fuel system) fault code. It indicates: Cylinder 1 Exhaust Valve Control Circuit/Open . This is a standardised OBD-II code. The technical definition is the same regardless of the make or model of vehicle, although specific causes and symptoms can vary between vehicles.
Symptoms
- Malfunction indicator lamp on with the variable valve or deactivation function disabled
- Ticking or tapping from the valvetrain on the affected cylinder
- Misfire and rough running, most noticeable when the system tries to switch modes
- Loss of power and a coarse idle
- Fuel economy worse than usual on steady driving
- Fault may set only when the engine bay is hot
Likely causes
- Open conductor in the solenoid control or supply wire
- Solenoid coil failed open internally
- Corroded, oil-contaminated or loose connector at the solenoid
- Terminal backed out of the connector body from vibration and heat
- Harness damage where it runs close to the exhaust side of the engine
- Poor ground path for the solenoid circuit
- Failed output driver in the PCM
How to fix it
- Check engine oil level and condition, since these valve control systems depend on oil pressure
- Read all codes and note whether misfire codes for the same cylinder are present
- Inspect the solenoid connector for oil, corrosion and terminals that have backed out
- Measure the solenoid winding resistance and compare it with specification
- Check continuity from the PCM connector to the solenoid and inspect the harness where it passes near hot components
- Wiggle-test the harness with the engine running while watching for the code to reset
- Repair the open circuit or replace the solenoid; inspect the mechanical actuator if the circuit tests good