P3407–P3495 Cylinder 1 Exhaust Valve Control Circuit Low
The voltage on this circuit is sitting near zero. Typically a short to earth, or a sensor that has failed to its low end.
Can you drive it? This class of fault can cause real mechanical damage if you keep driving on it. A persistent misfire also destroys the catalytic converter, which is the expensive part.
Which code is which
Same fault, different cylinder or bank — diagnosed the same way. Several set together usually means one shared cause.
| Code | Definition | Severity |
|---|---|---|
P3407 | Cylinder 1 Exhaust Valve Control Circuit Low | Do not keep driving |
P3415 | Cylinder 2 Exhaust Valve Control Circuit Low | Do not keep driving |
P3423 | Cylinder 3 Exhaust Valve Control Circuit Low | Do not keep driving |
P3431 | Cylinder 4 Exhaust Valve Control Circuit Low | Do not keep driving |
P3439 | Cylinder 5 Exhaust Valve Control Circuit Low | Do not keep driving |
P3447 | Cylinder 6 Exhaust Valve Control Circuit Low | Do not keep driving |
P3455 | Cylinder 7 Exhaust Valve Control Circuit Low | Do not keep driving |
P3463 | Cylinder 8 Exhaust Valve Control Circuit Low | Do not keep driving |
P3471 | Cylinder 9 Exhaust Valve Control Circuit Low | Investigate soon |
P3479 | Cylinder 10 Exhaust Valve Control Circuit Low | Do not keep driving |
P3487 | Cylinder 11 Exhaust Valve Control Circuit Low | Do not keep driving |
P3495 | Cylinder 12 Exhaust Valve Control Circuit Low | Do not keep driving |
The definition
P3407: Cylinder 1 Exhaust Valve Control Circuit Low.
P3407 is a manufacturer-specific powertrain code (the engine or gearbox). Its meaning is set by the carmaker rather than by the SAE standard, so a generic OBD-II reader will often show it as an unknown code or misread it.
What to check first
Cheapest and fastest checks first:
- Unplug the sensor. If the reading jumps to full scale, the wiring is fine and the sensor has failed low.
- Check the sensor's 5V supply and its earth before condemning the sensor itself.
Reading the code is the easy part
A code names the circuit that complained. What tells you why is watching the sensor behind it while the engine runs — and that is where a code reader stops and a diagnostic tool starts.
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Common questions
What does P3407 mean?
P3407 means Cylinder 1 Exhaust Valve Control Circuit Low. The voltage on this circuit is sitting near zero. Typically a short to earth, or a sensor that has failed to its low end.
Can I drive with P3407?
This class of fault can cause real mechanical damage if you keep driving on it. A persistent misfire also destroys the catalytic converter, which is the expensive part.