P0456 on Nissan
Evaporative Emission Control System Leak Detected (Very Small Leak)
P0456 on Nissan vehicles indicates evaporative emission control system leak detected (very small leak). Au7o has documented this code across 2 Nissan models — most commonly on Quest, Rogue. This emissions code means the evaporative emission (EVAP) control system has detected a very small leak — even tinier than the one flagged by P0442, roughly equivalent to a 0.020-inch hole. The EVAP system traps fuel vapors from the tank and prevents them from escaping into the atmosphere, and the computer tests for leaks by sealing the system and watching for pressure or vacuum loss. Because the leak is so small, the cause is often subtle, but a loose or worn gas cap is still the most common and easiest to check. It generally indicates a minor seal, hose, or valve leak somewhere in the fuel vapor system. Typical repair costs on Nissan range from $250 to $1,500, depending on the specific model and root cause.
Common Causes of P0456
- •Loose, worn, or faulty gas cap or cap seal
- •Cracked or loose EVAP hose or line
- •Leaking vent valve or purge valve not sealing
- •Damaged O-ring or seal at the fuel filler neck
- •Small crack or leak in the charcoal canister
- •Leaking fuel tank or sending unit gasket
- •Loose or corroded EVAP component connection
P0456 on Nissan by Model
Nissan Quest(1 issue)
- Rear A/C System Failure2011-2017
The Quest rear A/C system fails prematurely due to the rear evaporator developing leaks. The rear A/C then blows warm air while the front works normally. The rear expansion valve can also stick, preventing proper refrigerant flow. Repairing the rear A/C requires significant disassembly of interior panels.
Nissan Rogue(1 issue)
- EVAP Vent Control Valve / Charcoal Canister Faults Triggering Check Engine Light and Hard Refueling2008-2013
Rogue owners commonly report EVAP system faults caused by a sticking vent control valve, contaminated canister, or related hose issues. The problem often shows up as a persistent check engine light and, in some cases, the gas pump repeatedly clicks off during refueling because the tank cannot vent properly. Nissan service literature for EVAP leak and vent valve diagnosis exists, and complaint/forum activity is consistent across this generation.
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View P0456 across all makes →Frequently Asked Questions
What does P0456 mean on Nissan?▼
P0456 stands for "Evaporative Emission Control System Leak Detected (Very Small Leak)." This emissions code means the evaporative emission (EVAP) control system has detected a very small leak — even tinier than the one flagged by P0442, roughly equivalent to a 0.020-inch hole. The EVAP system traps fuel vapors from the tank and prevents them from escaping into the atmosphere, and the computer tests for leaks by sealing the system and watching for pressure or vacuum loss. Because the leak is so small, the cause is often subtle, but a loose or worn gas cap is still the most common and easiest to check. It generally indicates a minor seal, hose, or valve leak somewhere in the fuel vapor system. On Nissan specifically, this code is documented across 2 models.
What causes P0456 on Nissan vehicles?▼
Common causes on Nissan: Loose, worn, or faulty gas cap or cap seal, Cracked or loose EVAP hose or line, Leaking vent valve or purge valve not sealing, Damaged O-ring or seal at the fuel filler neck, Small crack or leak in the charcoal canister. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0456 on a Nissan?▼
Repair costs on Nissan range from $250 to $1,500, depending on the specific model and root cause.
Which Nissan models have P0456 documented?▼
Au7o has documented P0456 on 2 Nissan models: Quest, Rogue.