EVAP System Malfunction
The evaporative emission control system has a general malfunction.
Informational only. Consult a qualified mechanic.
- Loose or damaged gas cap
- EVAP canister leak
- Purge valve failure
- Vent valve failure
Check gas cap first. Tighten or replace it and clear the code.
What does P0440 mean?
The P0440 OBD-II diagnostic trouble code (DTC) indicates: evap system malfunction. This is a low-severity powertrain code that your vehicle's onboard diagnostics system triggers when the evaporative emission control system has a general malfunction. If your check engine light is on with this code, the vehicle is generally safe to drive, but you should have it inspected soon.
Use Your Service Book to log this diagnostic trouble code to your vehicle's service history, track repairs, and get maintenance reminders — all for free.
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