P0455 on a 2013 Honda Accord

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 Honda Accord

Ranked from 1,418 NHTSA owner complaints filed for this vehicle.

Sort by:

1
Fuel tank or fuel line leak (recall-era fuel system defect)
High severity
Multiple owners report a fuel odor and confirmed dealer-diagnosed fuel tank/line leaks on 2013 Accords tied to NHTSA recall 13V-297, large enough to be a big-leak source on this exact model year.
Reported in 4 NHTSA complaints
Parts:fuel tank fuel line
2
Missing, loose, or damaged gas cap
Medium severity
Several owners saw 'check fuel cap' warnings and had the cap replaced, though the light returned for some — worth ruling out first even though it often points back to the tank/line leak above on this model.
Reported in 3 NHTSA complaints
Parts:gas cap
3
Vent valve stuck open
Medium severity
A vent valve stuck open prevents the EVAP system from sealing at all, which reads as a large leak.
Common cause
Parts:vent valve
4
Purge valve stuck open
Medium severity
A purge valve that fails open lets continuous outside air into the system, mimicking a large leak.
Common cause
Parts:purge valve
5
Disconnected or cracked large EVAP hose/line
Medium severity
A fully detached or badly cracked line is a common large-leak source.
Common cause
6
Cracked charcoal canister
Medium severity
A significantly cracked canister housing opens enough of a leak path to fail the large-leak test.
Common cause
Parts:charcoal 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