P0455 on a 2019 Volkswagen Jetta

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 2019 Volkswagen Jetta

Ranked from 541 NHTSA owner complaints filed for this vehicle.

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1
Cracked or disconnected EVAP purge valve/hose assembly
Medium severity
Multiple owners had the purge valve or hose diagnosed as leaking or defective, a fault large enough to fail the leak-detection monitor.
Reported in 3 NHTSA complaints
Parts:purge valve
2
EVAP vent valve (fuel tank isolation valve) failure
High severity
VW Corporate confirmed code P00FE for a failed EVAP vent valve integrated with the fuel tank, a fault large enough to prevent normal refueling — consistent with a large-leak code.
Reported in 2 NHTSA complaints
Parts:EVAP vent valve
3
Leak-detection pump / fuel tank venting failure
High severity
Owners had the leak-detection pump and eventually the whole fuel tank replaced for chronic refueling shutoffs and spill-back; a pattern also covered by a related-model recall.
Reported in 2 NHTSA complaints
Parts:fuel tank
4
Fuel filler door actuator failure
Medium severity
A failed door actuator can prevent the sealed fuel-fill/EVAP system from sealing or venting correctly.
Reported in 1 NHTSA complaint
Parts:fuel door actuator
5
Loose, damaged, or missing gas cap
Low severity
The most frequent large-leak trigger; confirm the cap seats and clicks fully.
Common cause
Parts:fuel cap
6
Cracked or fully disconnected EVAP line
Medium severity
A split or unplugged line produces the large-leak threshold quickly during the self-test.
Common cause

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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