P0456 on Nissan: How to Diagnose & Fix
Evaporative Emission Control System Leak Detected (Very Small Leak)
3 Nissan models · 3 documented issues · $60-$1,500 repair
P0456 on Nissan by model: symptoms, diagnosis and fix
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.
Common Symptoms
- Rear A/C blows warm air
- Front A/C works but rear does not
- Hissing noise from rear A/C area
- A/C system low on refrigerant frequently
- Moisture or ice under rear of vehicle
How to Fix
Diagnose whether the rear evaporator or expansion valve has failed. Replace rear evaporator (requires interior panel removal, $800-1,500 labor-intensive). Replace rear expansion valve if stuck. Recharge A/C system after repair.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Genuine Nissan rear evaporator core 27411-CN000
2011-2017 Quest 3.5L VQ35DE, rear auxiliary HVAC; confirm VIN and required O-rings.
- Genuine Nissan rear expansion valve 92200-1JA0A
2011-2017 Quest rear auxiliary HVAC; confirm VIN and whether the valve is included with the selected evaporator assembly.
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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.
Common Symptoms
- Check engine light on
- Gas pump shuts off repeatedly while refueling
- Small or large EVAP leak codes
- Fuel odor near rear of vehicle
- Failed emissions inspection
How to Fix
Diagnosis includes smoke-testing the EVAP system, checking vent valve operation, inspecting the canister for saturation or debris, and verifying hose integrity near the rear of the vehicle. Repair may involve replacing the EVAP vent control valve, charcoal canister, damaged hoses, or corroded connectors, then clearing codes and confirming monitor completion.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Genuine Nissan EVAP canister vent-control valve 14935-JF02C
Not the engine-bay purge valve. The 2008-2010 drain-cut 14935-AM60B branch is excluded because its inspected OE listing was unavailable; confirm VIN and production date.
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Owner tips & cautions
- TipIf replacing the vent valve, inspect the canister and nearby hoses at the same time because debris or saturation can cause repeat failures.
After a loose/failed gas cap, the most common cause of EVAP leak codes (P0455 large leak, P0456 very small leak) on the Altima is a failed EVAP canister vent control valve mounted near the charcoal canister at the rear of the vehicle. The valve seal sticks or fails to seal, so the EVAP system can't pass its self-test. It typically starts as an intermittent small leak (P0456) and worsens into a gross leak (P0455). It does not affect drivability but causes a persistent check engine light and an emissions-test failure. Nissan issued TSBs (NTB09-020F, NTB13-097J, NTB17-082a) addressing the diagnostic path and this component.
Common Symptoms
- Check engine light with no drivability change
- Failed state emissions / smog test
- Fuel odor in some cases
- Code returns after replacing only the gas cap
How to Fix
Begin with a known-good OEM gas cap (aftermarket caps often will not seal). If the code persists, smoke-test the EVAP system; a sticking/leaking vent valve is the usual culprit and is replaced as a unit. OEM vent control valve part numbers for this generation include 14935-JF00E / 14935-JF01C / 14935-JF02C (supersession family 14935-JF00A through JF02C). Valve runs roughly $60-$110; OEM gas cap $25-$40.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Genuine Nissan fuel-filler cap 17251-ZX60A
2007-2012 Nissan Altima for this card, within the page's broader 2003-2012 fitment; verify VIN and filler-neck application.
- Genuine Nissan fuel-filler cap 17251-9BD0F
2013-2018 Nissan Altima; verify VIN/current supersession and cap-seal failure before purchase.
- Genuine Nissan fuel-filler cap 17251-5RL0B
2019-2020 Nissan Altima for this card, within the page's broader 2019-2025 fitment; confirm VIN and filler-neck application.
- Genuine Nissan EVAP canister vent-control valve 14935-JF02C
2009-2020 Nissan Altima for this card, within the page's broader fitment; verify VIN/current supersession.
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Sources for this issue (3)
P0456 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0456 mean on a 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 it is documented across 3 models: Quest, Rogue, Altima.
What are the most common causes of P0456?
The most common causes of P0456 are: 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. The specific cause varies by vehicle.
How much does it cost to fix P0456 on a Nissan?
Published repair estimates on Nissan range from $60 to $1,500 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P0456 on a different make?
View P0456 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.