P2143EGR Vent Control Circuit/Open
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- Vacuum-operated EGR valves are often run by a pair of solenoids: one feeds vacuum to the valve diaphragm to open it, the other – the vent solenoid – lets air in to release the vacuum and close the valve. Ford's EEC engine computers had separate outputs for EGR vent and EGR control, and a Kia diesel patent maps both solenoids by duty cycle, using the vent side whenever the measured EGR value is above target. P2143 means the module found the vent solenoid circuit open or otherwise faulty. Without a working vent the valve may close slowly or stay open longer than wanted, causing rough idle; many systems simply disable EGR. No manufacturer publishes thresholds for P2143. Shorts are reported separately as P2144 and P2145.
- What you may notice
- Check engine lamp on
- Rough idle or stalling after deceleration
- EGR readiness not completed
- Likely causes
- LikelyLoose connector or broken wire at the vent solenoid
- PossibleOpen coil in the vent solenoid
- RareBlown fuse or missing supply voltage to the solenoid
- RareFaulty output stage in the engine control module
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Easy · Often possible to do yourself.Typical cost: €30 – €250
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.