The evaporative emission control system has a general malfunction.
Informational only. Consult a qualified mechanic.
Check gas cap first. Tighten or replace it and clear the code.
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.
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