OBD-II Code · Emissions
P0443
EVAP Purge Control Valve Circuit
Severity
low
Lowest on our scale. Fix it when convenient.
Can you drive it
Only if running normally
A short trip to a shop may be reasonable if the light is steady and the car runs normally. Stop safely for a flashing light, severe shaking, overheating, loss of power, or another urgent warning. The code alone cannot confirm safety.
Indicative cost (USD)
$100–$300
Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
Purge control valve circuit fault.
How a shop works this
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed.
Note every code that is set, not just this one.
Codes that appear together usually narrow the cause faster than any one of them read alone.
Read the freeze frame — the conditions the fault was recorded under.
Cold or warm, idle or load, road speed and engine speed. A fault that only appears cold is a different fault from one that only appears under load, even with the same code on the scanner.
Confirm the fault is current rather than history.
Clear the code and see whether it returns under those same conditions. A code that does not come back may have been logged during a repair, a flat battery, or a bad connection that has since been disturbed.
Then work the likely-causes list in the order shown.
That order is what a shop checks first for this code — wiring and connections before the component they run to, because a connector costs nothing to inspect and is a common answer.
If the code comes back after a repair, the underlying fault is still there. That is the point to bring in a scanner with live data and freeze-frame, or a shop that has one.
Common symptoms
- Check engine light
- Minor fuel smell
Likely causes
- Failed purge valveMost common
- Wiring
Read the full diagnostic procedureP0443 is an electrical-circuit code, not a leak code — the ECU is reporting that the purge solenoid's control circuit is open, shorted, or otherwise…
P0443 is an electrical-circuit code, not a leak code — the ECU is reporting that the purge solenoid's control circuit is open, shorted, or otherwise outside the expected resistance/voltage range. This is the one EVAP code where smoke testing isn't the first move; the first move is a multimeter on the solenoid connector. Key-on, engine-off, you should see battery voltage on the power-side pin (the ECU supplies B+ to the solenoid and switches the ground); resistance across the solenoid itself should be in the 20-40 ohm range on most platforms.
Common causes in order of frequency
- corroded or backed-out connector pins at the purge solenoid (the connector sits in a hot, vibration-prone area), chafed wiring between the ECU and the solenoid, a failed solenoid coil (open winding), or rarely, a failed driver inside the ECU itself.
- The fuel cap is not the cause of P0443 — this is a wiring or component fault, full stop.
Vehicle-specific patterns2005-2015 Toyota/Lexus rarely throws P0443 unless a rodent has been chewing under the hood; when it does, it's usually a chafed wire where the harnes…
- 2005-2015Toyota/Lexus rarely throws P0443 unless a rodent has been chewing under the hood; when it does, it's usually a chafed wire where the harness passes a sharp bracket near the intake.
- 2003-2010Ford 4.6L applications throw P0443 alongside P0441 fairly often because the same heat-cycling that cracks the purge valve diaphragm also degrades the connector pins and pigtail wiring; many shops replace the purge solenoid AND its pigtail as a matched repair on this platform.
- 2007-2014GM full-size trucks see P0443 from connector corrosion when the truck has lived in road-salt states.
- 2008-2015VW/Audi can throw P0443 on the N80 purge valve circuit, often after another repair that disturbed the harness routing.
- 2012+Hyundai/Kia P0443 occurrences are most commonly bad connectors, sometimes a failed solenoid coil. Repair range: $0-20 for connector cleanup with dielectric grease, $80-200 for solenoid + harness pigtail, $400+ if internal ECU driver has failed.
Look up another code
P0443 — frequently asked
What does a P0443 code mean?
Purge control valve circuit fault.
What causes a P0443 code?
Common causes: Failed purge valve; Wiring.
What are the symptoms of a P0443 code?
Typical symptoms: Check engine light; Minor fuel smell.
Is it safe to drive with a P0443 code?
Only if running normally. A short trip to a shop may be reasonable if the light is steady and the car runs normally. Stop safely for a flashing light, severe shaking, overheating, loss of power, or another urgent warning. The code alone cannot confirm safety. Estimated repair: $100-$300.
How do I diagnose a P0443 code?
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed. 1. Note every code that is set, not just this one. 2. Read the freeze frame — the conditions the fault was recorded under. 3. Confirm the fault is current rather than history. 4. Then work the likely-causes list in the order shown.
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