P0455 on a 2013 Nissan Sentra

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 Nissan Sentra

Ranked from 638 NHTSA owner complaints filed for this vehicle.

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1
Loose, damaged, or improperly seated gas cap
Low severity
A gas cap that won't seal lets the EVAP system bleed off vacuum/pressure, the most common trigger for this code. On this vehicle an owner had the cap replaced for this exact fault code with the light returning, showing how persistent a bad seal or filler-neck thread can be.
Reported in 1 NHTSA complaint
Parts:gas cap
2
Small leak in the EVAP system (line, seal, or canister) beyond the gas cap
Medium severity
This vehicle's owner was specifically told the code returned due to a small leak in the evaporative system even after the gas cap was replaced, pointing to a downstream line/seal leak.
Reported in 1 NHTSA complaint
3
Cracked or disconnected EVAP hose/line
Medium severity
Rubber and plastic EVAP lines between the tank, canister, and purge/vent valves harden and crack with age/heat, or come loose at a connector, creating a leak path. A smoke test pinpoints the break.
Common cause
4
Purge valve stuck open or leaking
Medium severity
A leaking purge valve lets outside air into the EVAP system when it should be sealed, which the monitor reads as a leak. Test with a scan tool bidirectional command or vacuum gauge.
Common cause
Parts:purge valve
5
Vent valve/solenoid stuck open or failed
Medium severity
The canister vent valve normally seals during the leak-check monitor; if it's stuck open or the solenoid fails, the system can't hold vacuum/pressure and sets a leak code.
Common cause
Parts:EVAP vent valve
6
Cracked charcoal (EVAP) canister
Medium severity
The plastic canister housing can crack from age, road debris, or heat, creating an unsealable leak path in the EVAP system.
Common cause
Parts:EVAP canister
7
Rusted or corroded fuel filler neck
Medium severity
On older vehicles the filler neck can rust through (commonly near the cap seat), causing a leak the system can't overcome regardless of gas cap condition.
Common cause
Parts:fuel filler neck
8
Large leak from a disconnected or split fuel tank/vapor line
Medium severity
P0455 specifically flags a gross leak; a fully disconnected hose or split line at the tank or canister will set this large-leak code rather than the small-leak P0442.
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