P1440 Code: Evaporative Emission Purge Valve Stuck Open
🟠 Moderate severity · drivable
Driving is usually safe, but a stuck-open valve can cause rough idle and a strong fuel smell, so fix it soon.
What P1440 means
The purge valve in the evaporative emission (EVAP) system is stuck open. The valve is supposed to open only when the computer commands it to let stored fuel vapors into the engine; stuck open, it lets vapors flow all the time and can upset the air-fuel mixture, so the computer stores P1440.
Symptoms
- Check engine light is on
- Rough or fluctuating idle
- Strong fuel smell
- Poor fuel economy
Common causes
- most common: Purge valve stuck open from debris or wear
- common: Faulty purge valve solenoid
- common: Wiring or connector problem in the purge circuit
- less common: Carbon or dirt holding the valve open
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Replace the purge valve | Yes | $40–160 |
| Test the purge valve circuit and repair wiring | Yes | $20–100 |
| Have the EVAP system smoke-tested for related leaks | Mechanic | $50–150 |
Frequently asked questions
Can I drive with a P1440 code?
Yes, usually. The car will run, but a purge valve stuck open can cause rough idle and a fuel smell, so don't put off the repair.
What does a purge valve stuck open mean?
The valve lets fuel vapors flow into the engine constantly instead of only when the computer opens it, which upsets how the engine runs and can fail an emissions test.
How much does it cost to fix a P1440?
A replacement purge valve typically costs $40–$160 in parts, plus a little labor if you have a shop do it.
Related codes
P0441
P0441 Code: Evaporative Emission Control System Incorrect Purge Flow
P0446P0446 Code: Evaporative Emission Control System Vent Control Circuit Malfunction
P0455P0455 Code: Evaporative Emission Control System Leak Detected (Large Leak)
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.