P0440Low severity
Evaporative Emission Control System (EVAP) Malfunction
A general fault was detected in the evaporative emission (EVAP) system that controls fuel vapors.
Common causes
- Loose or faulty fuel cap
- Cracked EVAP hose
- Faulty purge or vent valve
- Leaking charcoal canister
Possible symptoms
- Check Engine Light on
- Fuel smell
- Slightly reduced fuel economy
Code breakdown
P — System
Powertrain (engine, transmission, fuel & emissions)
0 — Type
Generic (SAE standard, common to all manufacturers)
4 — Subsystem
Auxiliary emission controls