P0440 — Evaporative Emission Control System Malfunction
Category: Powertrain Severity: Medium
Updated:
DTC code P0440 means: Evaporative Emission Control System Malfunction. It falls under the "Powertrain" category, with an estimated severity of Medium. Common causes include loose or faulty fuel cap, eVAP leak and faulty purge valve; it's worth confirming the diagnosis before replacing parts.
Possible causes
- Loose or faulty fuel cap
- EVAP leak
- Faulty purge valve
- Damaged charcoal canister
Symptoms
- Check engine light
- Fuel smell
- No driving symptoms
How to diagnose it step by step
- Check the cap.
- Test the purge valve.
- Test the vent valve.
- Do a smoke test.
How to fix it
Check the fuel cap and the EVAP system hoses and valves.
Estimated repair cost
$10–450.
Frequently asked questions
What does DTC code P0440 mean?
Evaporative Emission Control System Malfunction.
Is code P0440 serious?
Severity Medium. Not urgent, but worth diagnosing to avoid bigger damage.
Can I keep driving with code P0440?
Yes, no risk to the engine.
Related codes
P0441 P0442 P0443 P0446 P0447 P0449 P0431 P0430 P0452 P0453
Refine by car make
- Audi P0440: Purge valve or EVAP leak.
- BMW P0440: Purge valve or EVAP leak.
- Citroën P0440: Canister or purge valve.
- Fiat P0440: Purge valve or EVAP leak.
- Ford P0440: Purge valve or fuel cap.
- Honda P0440: Fuel cap or purge valve.
- Opel P0440: Purge valve or EVAP leak.
- Peugeot P0440: Canister or purge valve.
- Renault P0440: Canister or purge valve.
- Toyota P0440: Purge valve or EVAP leak.
- Volkswagen P0440: Purge valve or EVAP leak.
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