P0440 on a Volkswagen: Causes, Fixes & Repair Cost

🟢 Low severity · drivable

You can drive normally — this is a general emissions-system fault, not an engine failure — but fix it before your next emissions test.

What P0440 means on a Volkswagen

On a Volkswagen, P0440 means the engine computer detected a general problem in the evaporative emission (EVAP) system that captures fuel vapors from the tank. It is the catch-all EVAP code, less specific than the leak-size codes P0442, P0455, and P0456, so it often appears with other EVAP codes. The car keeps running and driving normally.

Is P0440 common on Volkswagens?

P0440 is one of the more frequent EVAP codes on Volkswagens, often traced to a loose gas cap, cracked hoses, or a worn purge valve. The rubber EVAP lines near the engine bay and the fuel filler area are common leak points as they age. It is an emissions issue, not a drivability issue.

Commonly reported on: Golf, Jetta, Passat, Tiguan.

Symptoms

Check engine light on
Possible faint fuel smell
No change in performance

Common causes

most common: Loose, missing, or failing gas cap
common: Cracked or disconnected EVAP hoses
common: Faulty purge valve
less common: Leak at the fuel filler neck or seal

How to fix it

Fix	DIY?	Typical cost
Tighten or replace the gas cap	Yes	$10–30
Replace cracked EVAP hoses	Yes	$20–80
Smoke test the EVAP system to find the leak	Mechanic	$50–150
Replace the purge valve	Yes	$60–150