P0455 on a 2013 Ford Escape

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 Escape

Ranked from 2,743 NHTSA owner complaints filed for this vehicle.

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1
Disconnected, cracked, or split EVAP vapor line/hose
Medium severity
Owners describe a leaking fuel-vacuum line to the tank and lingering gasoline odor consistent with a larger vapor-line breach rather than a pinhole leak.
Reported in 3 NHTSA complaints
Parts:EVAP hose EVAP line
2
Stuck-open EVAP purge or canister vent valve
Medium severity
Same purge-valve failure pattern documented on this generation Escape (replaced twice by one owner, 'CVP stuck' diagnosed by another) — a valve stuck open holds the system at atmospheric pressure, reading as a large leak.
Reported in 2 NHTSA complaints
Parts:EVAP purge valve EVAP vent valve
3
Fuel tank pressure/vent valve stuck, unable to bleed tank vacuum
Low severity
One owner's hissing-at-the-pump complaint with a code indicating the tank could not bleed vacuum fits a stuck vent path large enough to register as a big leak.
Reported in 1 NHTSA complaint
Parts:EVAP vent valve fuel tank pressure sensor
4
Loose, cross-threaded, or missing fuel filler cap
Low severity
The classic large-leak trigger; a cap left loose or not fully seated produces a big enough leak to fail the EVAP monitor almost immediately after a fill-up.
Common cause
Parts:fuel filler cap
5
Cracked charcoal canister or damaged canister seal
Low severity
A larger crack or a torn canister-to-line seal produces a leak big enough to set P0455 quickly during the monitor's coarse leak test.
Common cause
Parts:EVAP charcoal canister
6
Rusted-through fuel filler neck
Low severity
Severe corrosion can perforate the filler neck outright, producing an obvious, large vapor leak rather than a slow one.
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