What does code P0440 mean and is it safe to drive?
P0440: Evaporative Emission System Control System Malfunction. Here’s what it means, what usually causes it, what repairs typically cost, and how urgent it is to keep driving.
PowertrainGenerally safe to drive
Repair cost
$20–$400
System
Powertrain
Urgency
low
What this code means
A general fault in the EVAP system—could be a leak, stuck valve, or sensor issue.
Common causes
- 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
Repairs for P0440 often fall between $20 and $400, depending on the cause and your vehicle.