P0443 Code: EVAP Purge Valve Circuit — Causes & Fix
P0443 means an electrical fault in the evaporative emissions (EVAP) purge control valve circuit — the valve that lets stored fuel vapour into the intake.
- Applies to
- All OBD-II vehicles (any make or model)
- Est. repair cost
- $30 – $300
- Time to fix
- 30 minutes – 2 hours
What it means
Common causes are a failed purge valve solenoid, a loose/corroded connector, or damaged wiring. P0443 is a generic OBD-II powertrain code defined in the SAE J2012 standard, so it applies to virtually any 1996-or-newer petrol car or light truck regardless of make. Fix the underlying fault, then clear the code with an OBD-II scan tool — it will return if the problem isn't resolved.
Symptoms
- Check engine light on
- Usually no drivability effect
- Possible rough idle if the valve sticks open
How to fix it
- 1
Inspect the purge valve connector and wiring
1. Locate the EVAP purge valve near the intake. 2. Reseat the connector and check the wiring.
- 2
Test and replace the valve
1. Check the solenoid resistance/operation. 2. Replace a failed valve, then clear the code.
Frequently asked questions
Can a stuck purge valve cause a rough idle?
Yes — if it sticks open it adds vapour at idle, which can cause a rough or stalling idle. A circuit fault (P0443) often precedes that.
Last updated July 19, 2026
Guidance only — always consult a qualified professional or the official service manual before carrying out repairs.