P3405 code meaning
Cylinder 1 Exhaust Valve Control Circuit/Open
Powertrain system Generic code P34xx codes Check engine light
What P3405 means
J2012 reserves P3405 for an open control circuit of a separate exhaust valve actuator on cylinder 1. No manufacturer documents this code publicly. The common systems do not need it: in GM's Dynamic Fuel Management one solenoid per cylinder feeds oil to both intake and exhaust lifters, and Ford's VDE only lists intake codes for cylinder 1. A GM patent application uses one shared hydraulic valve and only sets the order, with the exhaust valves switched off and back on before the intake valves; a Ford patent watches the exhaust valve via exhaust pressure. A separate exhaust actuator would fall under CARB's output component rule, which asks for continuity checks. If used, an open coil or wire would set P3405, while P3401 covers the intake side and P3406-P3408 the other exhaust faults.
P3405 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P3405
- Check engine lamp on
- Cylinder deactivation or valve switching disabled
Common causes of P3405
- PossibleBroken wire or loose terminal to the exhaust valve actuator
- PossibleOpen coil in the cylinder 1 exhaust valve actuator
- Less likelyOutput driver fault in the engine control module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Cylinder deactivation solenoidWiring harnessECM
What each part of P3405 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 3 | Mixed range: generic and manufacturer-specific codes. |
| 4 | Area: auxiliary emission controls (catalytic converter, EGR, EVAP). |
| 05 | The exact fault in that area. |
What to do next
- Note P3405 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P3405
What does P3405 mean?
P3405 means "Cylinder 1 Exhaust Valve Control Circuit/Open". J2012 reserves P3405 for an open control circuit of a separate exhaust valve actuator on cylinder 1. It is a generic code, so it means the same on every make.
Is it safe to drive with P3405?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P3405 fail an emissions test?
Yes, it can. P3405 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P3405 to fix?
Difficulty: medium. A typical repair takes 0.5 to 4 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P3405 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.