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P0440 P0xxx · 동력계 (P) 심각도 낮음
Evaporative Emission Control System Malfunction
The EVAP system failed its overall integrity check. Fuel vapour is escaping somewhere between the tank and the charcoal canister.
심각도 안내: 낮음 — 주행성에 영향이 거의 없으며 다음 정비 시 처리하세요
확인할 수 있는 증상
- Fuel smell around the vehicle
- Check-engine light
- Failed emissions test
- Occasional rough idle after refuelling
주요 원인
가능성이 높은 순서로 정렬되어 있습니다. 위부터 확인하세요.
- 1 Loose, missing or damaged fuel cap
- 2 Cracked vapour hose
- 3 Failed purge or vent solenoid
- 4 Leaking charcoal canister or tank seal
점검 방법
비용이 적고 침습적이지 않은 항목부터 — 대부분의 코드는 부품 문제가 아닙니다.
- ✓ Check the fuel cap first — it is the single most common cause and costs nothing.
- ✓ Smoke-test the EVAP system at the service port; leaks show up in seconds.
- ✓ Command the purge and vent solenoids with a scan tool and confirm they hold vacuum.
- ✓ Inspect the filler neck and tank seam for rust.
수리 방법
- Replace the fuel cap
- Repair the leaking hose or seal
- Replace the vent or purge solenoid
P0440 — 자주 묻는 질문
Is it dangerous to drive? +
Generally not, but a large leak is a fire risk and will fail inspection. Fix it reasonably soon.
Why does it come back after refuelling? +
A cap that does not seal or a damaged filler neck — the system detects the leak right after the tank is opened.