Powertrain, generic (extended)

P2143 EGR Vent Control Circuit/Open

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

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.

Likely causes

Loose connector or broken wire at the vent solenoid
Open coil in the vent solenoid
Blown fuse or missing supply voltage to the solenoid
Faulty output stage in the engine control module

Symptoms

  • Check engine lamp on
  • Rough idle or stalling after deceleration
  • EGR readiness not completed

Repair estimate

DifficultyEasyDIY possible
Parts and labour€30–250
Time0.3–1.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

egr vent solenoid

Related codes

P2144P2145P0403P0401

References: law.cornell.edu, patents.google.com, patents.google.com.