VW Check Engine Code
P0440 on VW
Evaporative Emission Control System Malfunction
Also covers: Volkswagen, Audi, SEAT, Skoda
P0440 on VW: what makes it different
P0440 (EVAP system malfunction) is a common code on VW's TSI and TDI models, usually traced to a loose or degraded fuel cap seal, a purge valve exposed to engine bay heat, or an aging charcoal canister.
Most-affected engines
- EA113 2.0T FSI/TSI (Golf, Jetta, GTI)
- EA888 1.8T/2.0T TSI (Golf, Passat, Tiguan, Atlas)
- EA189 2.0L TDI (Jetta, Golf, Passat)
Common model years: 2006–2016
Most likely cause on VW
A fuel cap that no longer seals properly, either loose or with a worn gasket, allowing the EVAP system to lose vacuum.
Known VW engine-family issues
On several TSI-equipped VW models, the EVAP purge valve is mounted close to the intake manifold where underhood heat accelerates plastic and seal degradation over time, making it a recurring wear item compared to some other makes.
VW-specific causes (most common first)
- Worn or improperly seated fuel cap gasket
- Purge valve failure from heat exposure near the intake manifold
- Cracked or brittle EVAP hoses in the engine bay due to age
- Charcoal canister vent valve sticking open or closed
- Fuel filler neck seal deterioration allowing a small leak
- Loose or corroded EVAP line fittings under the vehicle
VW-specific diagnostic tip
Start diagnosis at the fuel cap — remove and reseat it, then use a smoke machine on the EVAP system if the code returns, checking the purge valve and canister vent valve next since these are the most heat-exposed components on VW's layout.
Symptoms drivers report
- Check engine light
- Slight fuel smell (rare)
- No drivability issue
Typical repair cost on VW
Most VW owners fix P0440 for between $50 and $350, depending on which underlying cause turns out to be at fault. Start with the most-likely cause for your vehicle — A fuel cap that no longer seals properly, either loose or with a worn gasket, allowing the EVAP system to lose vacuum. — before throwing parts at it.
VW P0440 FAQ
Is a loose gas cap really enough to trigger P0440 on a VW?
Yes, VW's EVAP system is sensitive to small vacuum losses, and a cap that isn't fully tightened or has a worn seal is one of the most common triggers.
Why does the purge valve fail more often on VW turbo engines?
Its mounting location near the intake manifold on many TSI engines exposes it to more heat cycling than on some other manufacturers' layouts, accelerating wear.
Can driving with P0440 damage my VW's engine?
No, it won't harm the engine, but it can affect emissions performance and cause a failed inspection, so it's worth addressing before it's due for testing.
Related codes
Drive a different make? See the general P0440 guide for cross-vehicle causes and symptoms.
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Most common fix for P0440:
Replacement gas capAs an Amazon Associate, AXLY earns from qualifying purchases. General P0440 guide →