P0455 on a 2015 Dodge Durango

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 2015 Dodge Durango

Ranked from 502 NHTSA owner complaints filed for this vehicle.

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1
EVAP vent valve stuck open or venting path fault
Medium severity
Fuel continuing to pump/overflow at the pump on several vehicles points to a vent path that isn't sealing correctly, which shows up as an EVAP large-leak code.
Reported in 3 NHTSA complaints
Parts:EVAP vent valve
2
Fuel filler neck separation, crack, or clamp failure
High severity
Owners needed the fuel filler tube/neck replaced after separation or cracking, an opening large enough to set a P0455 gross-leak code.
Reported in 2 NHTSA complaints
Parts:fuel filler neck
3
Missing, loose, or damaged fuel filler (gas) cap
Medium severity
A large EVAP leak on this vehicle was traced directly to having no functioning gas cap — the classic trigger for a P0455 large-leak code.
Reported in 1 NHTSA complaint
Parts:fuel filler cap
4
Charcoal (EVAP) canister crack or loose media
Medium severity
An EVAP leak was diagnosed with loose charcoal noted inside the canister, a known failure that can produce a large-leak code.
Reported in 1 NHTSA complaint
Parts:charcoal canister
5
Cracked or disconnected EVAP hose/line
Medium severity
A fuel-line leak reported by the onboard computer, clearing and returning, is consistent with a larger intermittent EVAP hose breach.
Reported in 1 NHTSA complaint
Parts:EVAP hose
6
Purge valve stuck open
Low severity
A purge valve that won't seal can bleed enough vapor to register as a gross leak under some test conditions.
Common cause
Parts:EVAP purge valve
7
Rusted or corroded fuel tank or filler neck
Low severity
Rust-through large enough to be visible creates a gross vapor/fuel leak path.
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