P0455 on a 2015 Honda Cr V

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 Honda Cr V

Ranked from 668 NHTSA owner complaints filed for this vehicle.

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1
Cracked or rodent-damaged fuel/EVAP line causing a raw fuel leak
High severity
Two owners in this batch had a mechanic find rodent-chewed fuel line with visible leak points and a strong, sustained fuel odor -- consistent with a large-leak-size fault.
Reported in 2 NHTSA complaints
Parts:fuel line
2
Leaking high-pressure fuel pump/fuel rail
High severity
One owner reported a leaking HPFP with fuel smell inside the cabin; a leak of this size is well within large-leak-detection range.
Reported in 1 NHTSA complaint
Parts:fuel pump
3
Missing, loose, or badly worn gas cap
Low severity
A cap left off or badly worn is the classic quick check for a large EVAP leak.
Common cause
Parts:fuel filler cap
4
Cracked fuel tank or damaged tank seam
High severity
A split seam or stress crack in the tank itself produces a leak large enough to fail the large-leak test.
Common cause
Parts:fuel tank
5
Rusted, corroded, or split fuel filler neck
Medium severity
Under-body rust or impact damage to the filler neck is a common large-leak source on Rust Belt vehicles.
Common cause
Parts:fuel filler neck
6
Purge valve stuck open
Low severity
A purge valve that fails wide open prevents the system from holding pressure during the EVAP test.
Common cause
Parts:purge valve
7
Vent valve/canister vent solenoid stuck open
Low severity
A vent valve stuck open is one of the most common large-leak-code causes fleet-wide.
Common cause
Parts:vent valve
8
Cracked charcoal canister
Low severity
A cracked canister housing can produce a large-enough leak to fail the monitor outright.
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