P3424 code meaning
Cylinder 3 Exhaust Valve Control Circuit High
Powertrain system Generic code P34xx codes Check engine light
What P3424 means
P3424 closes the cylinder 3 block and stands for an exhaust actuator control line that is held at supply voltage. No manufacturer documents this code publicly. The L84 from GM shows how far one shared solenoid can be monitored without it: for cylinder 3 the ECM checks a low-side driver under P3417, P3419 and P3420 and a high-side driver under extra codes of its own, yet none of them is exhaust-only. A GM patent application explains why: one hydraulic switching valve per cylinder pair serves intake and exhaust, the order being set by the cam lobes. The nearest documented test is the one behind P3420, in which a supply connection of less than half an ohm, seen with the output active, is judged a short. A driver would notice only the lamp.
P3424 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 P3424
- Check engine lamp on
- Engine runs on all cylinders permanently
Common causes of P3424
- PossibleExhaust actuator wire chafed against a supply line
- PossibleShorted turns in the exhaust actuator of cylinder 3
- Less likelyEngine control module output 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 P3424 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). |
| 24 | The exact fault in that area. |
What to do next
- Note P3424 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 P3424
What does P3424 mean?
P3424 means "Cylinder 3 Exhaust Valve Control Circuit High". P3424 closes the cylinder 3 block and stands for an exhaust actuator control line that is held at supply voltage. It is a generic code, so it means the same on every make.
Is it safe to drive with P3424?
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 P3424 fail an emissions test?
Yes, it can. P3424 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 P3424 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 P3424 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.