P0456 on Nissan: How to Diagnose & Fix
Evaporative Emission Control System Leak Detected (Very Small Leak)
2 Nissan models · 2 documented issues · $250-$900 repair
P0456 on Nissan by model: symptoms, diagnosis and fix
The check-engine light comes on with code P0456 (EVAP very small leak) because the O-ring seal where the vent control valve mounts to the charcoal canister leaks. All 2008 and newer Nissan vehicles except LEAF and Titan XD diesel, which includes the 2008-2020 Altima; the bulletin applies only once a loose fuel cap has been ruled out.
How to Fix
Per Nissan bulletin NTB17-082E, the technician first rules out a loose fuel fill cap, confirms the leak at the vent control valve-to-canister joint, then replaces the vent control valve as an assembly (the O-ring is no longer sold separately). Nissan's NTB09-020f notes that on 2007-2011 vehicles a loose fuel cap can itself cause P0442, P0455 or P0456. Normal warranty rules apply; this is not a recall or a promise of free repair.
Sources for this issue (2)
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.
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
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.
Sources for this issue (1)
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 2 models: Altima, Rogue.
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 $250 to $900 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 →Join 700+ subscribers following Au7o for vehicle insights and updates.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.