What does code P0440 mean?
A general malfunction is detected in the EVAP system, preventing proper control of fuel vapors.
OBD-II Code
P0440 — Evaporative Emission Control System Malfunction
A general malfunction is detected in the EVAP system, preventing proper control of fuel vapors.
Common symptoms
- Fuel odor
- check engine light with minimal drivability symptoms
Possible causes
- Loose or faulty fuel cap
- EVAP leaks
- defective purge solenoid
Initial recommendation
Ensure fuel cap is properly secured, inspect EVAP lines for leaks and test purge valve.
Safety notice
This information is for guidance only and does not replace a physical vehicle inspection or diagnosis by a qualified mechanic. If the vehicle has severe power loss, smoke, a fuel odor, overheating, brake or steering problems, or any unsafe behavior, avoid driving it and seek professional inspection.
Analyze this code with MecaOBD
Use the app to combine code P0440 with your vehicle's actual symptoms for more complete diagnostic guidance.
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