P0455 on a 2022 Volkswagen Tiguan

P0455 means the EVAP system failed a leak check badly enough that the computer sees a large leak or no pressure/vacuum change.

Not your vehicle? See general P0455 info.

Most common causes on the 2022 Volkswagen Tiguan

Ranked from 246 NHTSA owner complaints filed for this vehicle.

Sort by:

1
EVAP leak detection pump (DMTL pump) fault
Medium severity
Two owners had the leak detection pump replaced as part of EVAP 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 canister being replaced due to oil contamination reaching the EVAP system.
Reported in 1 NHTSA complaint
Parts:charcoal canister
4
Gas cap missing, loose, or failing to seal
Low severity
The single most common large-leak cause; a cap not fully seated or with a worn seal is enough to trip this code quickly.
Common cause
5
Disconnected or split EVAP hose/line
Medium severity
A hose popped off a fitting or split open creates the wide-open leak path this code is designed to detect.
Common cause
6
Rusted or corroded fuel filler neck
Low severity
Advanced corrosion at the filler neck can open a gap large enough to trip the large-leak monitor.
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. P0455 on your car still needs shop confirmation before any repair.

Common symptoms

Check engine light
Fuel smell
Usually no performance issue
Failed emissions readiness

What to check before replacing parts

Check the gas cap first

Look for: A loose, missing, or cross-threaded cap is by far the most common cause of a large EVAP leak code — if it doesn't click to full tightness or the seal is cracked, that's very likely the whole fault.

Inspect visible EVAP hoses

Look for: A large leak is often obvious: a hose disconnected at a fitting, split open, or chewed through (rodent damage is common) rather than a hairline crack.

Command the purge and vent valves with a scan tool

Look for: A valve that doesn't respond at all when commanded open/closed, or stays open when it should seal, prevents the system from holding pressure/vacuum and reads as a large leak.

Smoke-test the system

Look for: With a large leak, expect an obvious plume of smoke or a clearly audible hiss at the fault location — it should be easy to spot compared to a small-leak diagnosis.

Inspect the canister and filler neck

Look for: A cracked charcoal canister housing or a corroded/rusted-through filler neck (common on older vehicles) can leak enough to prevent the system from ever holding vacuum.

Rather have a pro handle it? Find a vetted local mechanic.

Matching symptoms

Check Engine Light