The Lemon IndexThe system that traps fuel vapor from the gas tank has a fault.
Drive on, get it checked. You can usually keep driving. Have the code read at your next service or within a few weeks.
Loose or bad gas cap. Then: leaking EVAP hose; faulty purge or vent valve.
Owners named P0440 in 31 complaints to the U.S. government, most often on the Dodge Durango.
Cars owners report it on
Complaints that name P0440, by model. Raw counts, not a failure rate: popular models get more complaints.
Years owners report it on most: 2003 Dodge Durango · 2003 GMC Envoy · 2015 Jeep Grand Cherokee
The details
What P0440 means
The system that traps fuel vapor from the gas tank has a fault. It's an emissions problem, not usually a drivability one.
Can I drive with P0440?
Drive on, get it checked. You can usually keep driving. Have the code read at your next service or within a few weeks.
13% of the owner complaints that name P0440 also say the car fuel smell or fuel leak. A complaint can describe more than one problem, so this doesn't prove the code caused it.
Common causes of P0440
- Loose or bad gas cap
- Leaking EVAP hose
- Faulty purge or vent valve
A shop should confirm the cause with a scan and tests before replacing parts.
What owners describe
- Fuel smell or fuel leak: 13% of complaints
- Stalls or shuts off: 10% of complaints
- Warning lights and electrical faults: 6% of complaints
- Transmission slips or shifts hard: 6% of complaints
Share of complaints naming the code whose text also mentions each problem.
Model years that report P0440 most
2003 Dodge Durango (2), 2003 GMC Envoy (2), 2015 Jeep Grand Cherokee (2).
Related codes
P0441 P0442 P0443 P0445 P0446 P0448 P0449 P043F
Quick answers
What does P0440 mean?
Evaporative Emission System. The system that traps fuel vapor from the gas tank has a fault. It's an emissions problem, not usually a drivability one.
Can I drive with P0440?
Drive on, get it checked. You can usually keep driving. Have the code read at your next service or within a few weeks.
What causes P0440?
Loose or bad gas cap; Leaking EVAP hose; Faulty purge or vent valve.
Counts: NHTSA owner complaints whose text names P0440. A complaint is an owner's report, not a diagnosis. Meanings: the standard SAE J2012 definitions in our own words; manufacturer codes only where verified for that make. General information, not repair advice for your car.