P2143 moderate

Exhaust Gas Recirculation Vent Control Circuit Open

The P2143 code means the vehicle's onboard diagnostic system has detected: Exhaust Gas Recirculation Vent Control Circuit Open. This is a moderate severity code.

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Keep driving?: Yes, but fix soon
DIY difficulty: moderate
Estimated cost: $80 - $300 (parts and labor)

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Common Symptoms

Increased NOx emissions
Possible rough idle
Reduced fuel economy
EGR system inoperative
Check engine light on

Probable Causes (Ranked by Likelihood)

Open circuit in EGR vent control solenoid wiring Very High
Faulty EGR vent control solenoid High
Disconnected solenoid connector High
Corroded connector pins Moderate
PCM driver circuit failure for EGR vent Low

Step-by-Step Diagnostic Procedure

Locate EGR vent control solenoid and verify connector is plugged in
Measure solenoid coil resistance -- typical spec is 20-40 ohms
Check for open circuits in wiring from PCM to EGR vent solenoid
Test solenoid operation by applying 12V directly -- should click and actuate
Replace EGR vent solenoid if coil resistance is infinite (open)

Frequently Asked Questions

Can I drive with code P2143?

Yes, the vehicle is safe to drive. The EGR vent control being open means the EGR system cannot properly regulate exhaust gas recirculation. You may notice slightly rougher idle and the vehicle will produce more NOx emissions.

What is the EGR vent control solenoid?

The EGR vent control solenoid is a vacuum or electrically operated valve that helps control the EGR valve position by venting vacuum or pressure from the EGR actuator. It works in conjunction with other EGR components to regulate exhaust gas flow.

Will this affect my emissions test?

Yes. A non-functioning EGR system typically causes higher NOx emissions, which will likely result in an emissions test failure. Additionally, the check engine light being on will cause an automatic failure in OBD-II emissions testing states.