P3407 code meaning
Cylinder 1 Exhaust Valve Control Circuit Low
Powertrain system Generic code P34xx codes Check engine light
What P3407 means
P3407 stands for a short to ground in the control circuit of a dedicated exhaust valve actuator on cylinder 1. No manufacturer documents this code publicly, so there are no published thresholds. As an analogy, GM's intake-side code P3403 counts an impedance under 0.5 ohm to ground, seen with the driver off, as a fault. CARB requires such output circuits to be checked for shorts. Engines with one shared solenoid per cylinder, like GM's AFM and DFM V8s, report this fault under the intake-side codes instead. An open exhaust circuit would be P3405, a short to power P3408. The car usually keeps running normally on all cylinders, with a warning lamp.
P3407 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 P3407
- Check engine lamp on
- No change to reduced-cylinder mode
Common causes of P3407
- PossibleActuator control wire shorted to ground
- PossibleInternal short in the exhaust valve actuator
- Less likelyEngine control module output stage fault
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 P3407 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). |
| 07 | The exact fault in that area. |
What to do next
- Note P3407 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 P3407
What does P3407 mean?
P3407 means "Cylinder 1 Exhaust Valve Control Circuit Low". P3407 stands for a short to ground in the control circuit of a dedicated 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 P3407?
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 P3407 fail an emissions test?
Yes, it can. P3407 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 P3407 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 P3407 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.