P0455 on a 2010 Ford Edge

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 2010 Ford Edge

Ranked from 672 NHTSA owner complaints filed for this vehicle.

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1
Corroded or leaking fuel tank / filler neck (subject of NHTSA recall 15V712000)
High severity
By far the dominant pattern in this vehicle's complaints: repeated reports of gas odor, fuel stains under the car, and a dealer-confirmed corroded/leaking tank, tied to Ford's own fuel-tank recall for this model — large enough leaks here to soak the driveway.
Reported in 13 NHTSA complaints
Parts:fuel tank fuel filler neck
2
Fuel pump seal/connector failure allowing a large vapor path
Medium severity
One owner's fuel pump failed intermittently and overheated badly enough to melt its electrical connector, which can compromise the tank's vapor seal at the pump module.
Reported in 1 NHTSA complaint
Parts:fuel pump
3
Gas cap missing, loose, or not fully seated
Low severity
A large-leak code is most often simply a cap left loose or missing after fueling — check first.
Common cause
Parts:gas cap
4
Disconnected, split, or crushed EVAP hose
Medium severity
A fully detached or split EVAP line creates a large, unrestricted leak path.
Common cause
Parts:EVAP hose
5
EVAP vent valve stuck open
Low severity
A vent valve stuck open prevents the system from ever sealing, commonly showing up as the large-leak code.
Common cause
Parts:vent valve
6
Charcoal canister crack
Low severity
A significantly cracked canister housing can leak enough vapor to register as a large leak.
Common cause
Parts:EVAP canister

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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