P0442 on a 2022 Volkswagen Tiguan

P0442 means the EVAP system could not hold pressure or vacuum during a leak test, but the leak is small.

Not your vehicle? See general P0442 info.

Most common causes on the 2022 Volkswagen Tiguan

Ranked from 246 NHTSA owner complaints filed for this vehicle.

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1
EVAP leak detection pump (DMTL pump) fault
Medium severity
Two owners had the leak detection pump replaced as part of EVAP-related repairs on this vehicle, directly implicating this component.
Reported in 2 NHTSA complaints
Parts:leak detection pump
2
Purge valve (N80) failure or sticking
Medium severity
One repair record specifically lists the N80 purge valve being replaced along with blown-out EVAP lines.
Reported in 1 NHTSA complaint
Parts:purge valve
3
EVAP canister contamination or crack
Medium severity
One record describes the charcoal canister being replaced due to oil contamination reaching the EVAP system from an unrelated engine fault.
Reported in 1 NHTSA complaint
Parts:charcoal canister
4
Loose, damaged, or missing gas cap
Low severity
The most common small-leak cause across all makes; check for a worn cap seal or a cap not fully seated.
Common cause
5
Cracked or disconnected EVAP hose/line
Medium severity
Small cracks in the EVAP lines running under the vehicle are a frequent small-leak source.
Common cause
6
Rusted or corroded fuel filler neck
Low severity
Corrosion at the filler neck seal can create a slow leak that only shows up as an EVAP small-leak code.
Common cause
Parts:fuel filler neck

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These causes are aggregated from NHTSA owner complaints and general repair knowledge — this is not a diagnosis. P0442 on your car still needs shop confirmation before any repair.

Common symptoms

Check engine light
Fuel smell near vehicle
Usually drives normally
Hard start after fueling in some cases

What to check before replacing parts

Tighten and inspect the gas cap

Look for: A cap that doesn't click to full tightness, has a visibly cracked or flattened seal, or is simply missing is the single most common cause of a small EVAP leak — rule it out first.

Smoke-test the EVAP system

Look for: Because this is a small leak, expect only a thin wisp of smoke or a faint hiss at one spot (a hose, seam, or valve) rather than an obvious cloud — look closely and take your time.

Check purge valve sealing

Look for: A purge valve that doesn't hold vacuum when commanded closed lets a small amount of air bleed through, which the system reads as a leak during its self-test.

Inspect hoses near the tank and engine bay

Look for: Look for small cracks, soft/collapsed spots, or a hose that has pulled loose slightly at a fitting — any of these can leak just enough to trip a small-leak code without an obvious fuel smell.

Verify vent valve operation

Look for: A vent valve that doesn't seal fully when commanded closed prevents the system from holding vacuum during its self-test, which reads as a small leak even with no physical leak in the hoses.

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Matching symptoms

Check Engine Light