P3431 code meaning
Cylinder 4 Exhaust Valve Control Circuit Low
Powertrain system Generic code P34xx codes Check engine light
What P3431 means
P3431 reports a cylinder 4 exhaust actuator line shorted to ground. No manufacturer documents this code publicly. Cylinder 4 is switched off by Chrysler's MDS Hemi as well as by GM's V8s with AFM or DFM, but each of them runs a single solenoid per cylinder, so their bulletins and tables only list intake-side circuit codes: Ram's 2025 software bulletin 18-002-25 names P3425 next to P3401, P3441 and P3449, and for GM's 2019 L84, P3427 handles a grounded line of under half an ohm, checked while the output rests and confirmed 20 times in 25 (Type B). That is the closest documented test; CARB would demand the same kind of short detection for a separate exhaust output. Drivers would see the lamp, and cylinder shutdown would cease.
P3431 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 P3431
- Check engine lamp on
- Engine stays on all cylinders
Common causes of P3431
- PossibleCylinder 4 exhaust actuator lead grounded on the block or a bracket
- PossibleInternal short to ground in the exhaust actuator
- Less likelyControl module driver 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 P3431 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). |
| 31 | The exact fault in that area. |
What to do next
- Note P3431 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 P3431
What does P3431 mean?
P3431 means "Cylinder 4 Exhaust Valve Control Circuit Low". P3431 reports a cylinder 4 exhaust actuator line shorted to ground. It is a generic code, so it means the same on every make.
Is it safe to drive with P3431?
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 P3431 fail an emissions test?
Yes, it can. P3431 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 P3431 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 P3431 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.