OBD-II diagnostic trouble code
P0440Safe to drive
Evaporative Emission Control System Malfunction
A general EVAP system fault has been detected without pinpointing the specific leak size or component — check the fuel cap first, as with most EVAP codes.
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Code names are compiled from open/standardized SAE and ISO references. Explanations, symptoms, causes and fixes are original. Covers generic (P0/C0/B0/U0) codes only — manufacturer-specific codes are planned for a future update.
Frequently asked questions
Can I drive with P0440?
In most cases, yes — P0440 is generally not an urgent safety issue and the car is usually safe to drive for a while. Still, get it checked soon, since the underlying cause can affect fuel economy or emissions the longer it's left.
How much does it cost to fix P0440?
The cost varies too much by cause and vehicle to give a single figure here — a diagnosis will narrow it down.
What causes P0440?
Reviewed by Artyom SemenovAutomotive Editor · Fact-checked by Yauheni Kapliarchuk, Editor-in-Chief