What does code P0440 mean on a Honda and is it safe to drive?
P0440: Evaporative Emission System Control System Malfunction. Here's what it means on your Honda, what usually causes it, what repairs typically cost, and how safe it is to keep driving.
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What this code means
A general fault in the EVAP system—could be a leak, stuck valve, or sensor issue.
Common causes for your Honda
- Gas cap loose or faulty
- Purge or vent valve stuck
- Charcoal canister or hose leak
Symptoms
- Check Engine Light
Typical fixes
- Replace gas cap
- Test purge/vent valves
- Smoke test EVAP system
Repair cost range
For a Honda, repairs for P0440 often fall between $20 and $400, depending on the cause and whether you use OEM or aftermarket parts. Labor rates vary by location.
Known issues on Honda
Honda EVAP systems are sensitive to gas cap sealing. If the cap is confirmed good, the purge valve solenoid mounted on the intake manifold is the most common P0440 cause on older Civics and Accords. It's inexpensive and straightforward to replace.
Most commonly affected models
Accord 2003–2007CR-V 2002–2006Civic 2001–2005