P3408–P3496 Cylinder 1 Exhaust Valve Control Circuit High
The voltage on this circuit is sitting near battery voltage. Typically a short to a positive feed, or a disconnected sensor floating high.
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 |
|---|---|---|
P3408 | Cylinder 1 Exhaust Valve Control Circuit High | Do not keep driving |
P3416 | Cylinder 2 Exhaust Valve Control Circuit High | Do not keep driving |
P3424 | Cylinder 3 Exhaust Valve Control Circuit High | Do not keep driving |
P3432 | Cylinder 4 Exhaust Valve Control Circuit High | Do not keep driving |
P3440 | Cylinder 5 Exhaust Valve Control Circuit High | Do not keep driving |
P3448 | Cylinder 6 Exhaust Valve Control Circuit High | Do not keep driving |
P3456 | Cylinder 7 Exhaust Valve Control Circuit High | Do not keep driving |
P3464 | Cylinder 8 Exhaust Valve Control Circuit High | Do not keep driving |
P3472 | Cylinder 9 Exhaust Valve Control Circuit High | Investigate soon |
P3480 | Cylinder 10 Exhaust Valve Control Circuit High | Do not keep driving |
P3488 | Cylinder 11 Exhaust Valve Control Circuit High | Do not keep driving |
P3496 | Cylinder 12 Exhaust Valve Control Circuit High | Do not keep driving |
The definition
P3408: Cylinder 1 Exhaust Valve Control Circuit High.
P3408 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 and check whether the signal falls. If it stays high, suspect the wiring rather than the sensor.
- Check the earth path - a missing earth makes a sensor read high.
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.
VAGPULSE reads your engine ECU's fault codes and the live measuring blocks behind them, and clears the codes once you have fixed the fault. On the engine it also does what a generic OBD reader cannot on a VAG: coding, adaptations, and Stage 1–3 flashing on Bosch ME7 petrol ECUs, with a backup saved every time it reads your ECU.
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Common questions
What does P3408 mean?
P3408 means Cylinder 1 Exhaust Valve Control Circuit High. The voltage on this circuit is sitting near battery voltage. Typically a short to a positive feed, or a disconnected sensor floating high.
Can I drive with P3408?
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.