P0440Low urgency
Evaporative Emission Control System Malfunction
Emission · EVAP System
✅ Safe to drive — check gas cap first.
What this means
A general EVAP system fault. Often cleared by tightening the gas cap. If it returns, the charcoal canister or purge valve may be faulty.
Likely causes
- Loose or faulty gas capMost common
- Cracked EVAP hoseCommon
- Failed purge valveCommon
Estimated repair cost
Gas cap replacement$10 – $30
EVAP purge valve$75 – $200
Charcoal canister$150 – $400
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Frequently asked questions
What does P0440 mean?
A general EVAP system fault. Often cleared by tightening the gas cap. If it returns, the charcoal canister or purge valve may be faulty.
Is P0440 serious?
Safe to drive — check gas cap first.
How much does it cost to fix P0440?
Repair costs for P0440 range from $10 – $30 depending on the root cause and your vehicle.
Can I drive with P0440?
Yes, the vehicle is safe to drive. Schedule a repair at your convenience.