P0443 minor

Evaporative Emission Control System Purge Control Valve Circuit Malfunction

What does P0443 mean?

The P0443 code means the vehicle's onboard diagnostic system has detected: Evaporative Emission Control System Purge Control Valve Circuit Malfunction. This is a minor severity code.

Common Symptoms

  • Check Engine Light on
  • Rough idle if purge valve is stuck open
  • Fuel odor from engine bay

Probable Causes (Ranked by Likelihood)

  • Failed EVAP purge solenoid (stuck open or closed) Very High
  • Open or shorted wiring to purge solenoid Moderate
  • Blown fuse for purge circuit Low

Step-by-Step Diagnostic Procedure

  1. Test purge solenoid resistance: typical spec is 14-30 ohms. Out of range means replace the solenoid.

  2. Command the solenoid open and closed with a scan tool. Listen for an audible click.

  3. Inspect the wiring harness from the PCM to the solenoid for damage.

  4. Check fuses for the EVAP/purge system circuit.

Frequently Asked Questions

Can a stuck-open purge valve cause a rough idle?

Yes. If the purge valve is stuck open, fuel vapors flow continuously into the intake at idle, creating an overly rich condition that causes rough or erratic idling, particularly on a cold start.

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