P3431Cylinder 4 Exhaust Valve Control Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- 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.
- What you may notice
- Check engine lamp on
- Engine stays on all cylinders
- Likely causes
- PossibleCylinder 4 exhaust actuator lead grounded on the block or a bracket
- PossibleInternal short to ground in the exhaust actuator
- RareControl module driver fault
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €60 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.