P0455 on a 2013 Ford Fusion

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 2013 Ford Fusion

Ranked from 1,948 NHTSA owner complaints filed for this vehicle.

Sort by:

1
Canister purge valve (CPV) stuck open, causing a large, continuous EVAP leak
High severity
Multiple owners had the purge valve diagnosed or replaced after stalling/rough-start symptoms right after refueling, a classic purge-valve signature.
Reported in 9 NHTSA complaints
Parts:purge valve
2
P1450-type large EVAP leak from a blocked/faulty fuel-tank vent path
Medium severity
Owners reported the code P1450 ("unable to bleed up fuel tank vacuum") along with stalling and a whistling/whining noise near the fuel tank consistent with a restricted or leaking vent path.
Reported in 1 NHTSA complaint
3
Fuel vapor odor from a cracked EVAP canister or purge/vent line
Medium severity
A strong gasoline smell was traced to the evaporative system with no external leak found on inspection, consistent with a small internal EVAP crack.
Reported in 1 NHTSA complaint
Parts:EVAP canister EVAP lines
4
Loose, cross-threaded, or worn fuel filler cap
Low severity
The single most common trigger for a small EVAP leak code; check that the cap clicks fully and the seal isn't cracked before condemning any other component.
Common cause
Parts:fuel cap
5
Cracked or brittle EVAP hoses/lines
Medium severity
Heat- and age-cracked rubber EVAP lines under the vehicle are a frequent small-leak source; smoke-test the system to pinpoint.
Common cause
Parts:EVAP lines
6
Rusted or corroded fuel filler neck
Low severity
Rust-through of the filler neck creates a leak path that a smoke test will reveal; more common on high-mileage, road-salt-exposed vehicles.
Common cause

Part links go to Amazon search results for this vehicle. As an Amazon Associate, WrenchConnect earns from qualifying purchases — always confirm fitment for your exact trim and engine before ordering.

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