P0447 on Infiniti: How to Diagnose & Fix
Evaporative Emission System Vent Control Circuit Open
1 Infiniti model · 1 documented issue · $40-$450 repair
P0447 on Infiniti by model: symptoms, diagnosis and fix
Owners occasionally report check-engine lights caused by EVAP system leaks, often related to the gas cap, purge control valve, vent valve, or associated hoses. These faults usually do not affect drivability much, but they can prevent emissions readiness and trigger recurring warning lights.
Common Symptoms
- Check engine light on
- Loose or worn gas cap
- Failed emissions inspection
- Occasional fuel vapor smell
- No major drivability change
How to Fix
Diagnosis starts with reading EVAP-related codes, inspecting the fuel cap seal, and smoke-testing the EVAP system for leaks. Repairs may be as simple as replacing the gas cap or may require a purge/vent solenoid and hose replacement; typical cost runs from about $40 to $450 depending on the fault.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Genuine Infiniti early-production fuel filler capOEMInfiniti 17251-1NC0B
The 2010-2011 overlap with 4BA0B reflects production/supersession changes; confirm VIN and cap/filler-neck configuration rather than choosing
- Genuine Infiniti current-production fuel filler capOEMInfiniti 17251-4BA0B
Confirm VIN/build because 2010-2011 overlaps the earlier 1NC0B branch.
- Genuine Infiniti VK50VE EVAP purge-control valveOEMInfiniti 14930-JA10D
It is not the canister vent valve; confirm VIN and connector.
- Genuine Infiniti EVAP canister vent-control valveOEMInfiniti 14935-JF02C
vent-valve branch after P0447 circuit and smoke/command testing proves the valve failed Fitment/availability: Infiniti 14935-JF02C supersedes the JF00A-E family and is cataloged for the 2009-2013 FX50 EVAP vent position. Test wiring and …
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Owner tips & cautions
- TipDo a smoke test before replacing multiple EVAP parts; small hose leaks are easy to miss visually.
- TipClear the code only after tightening or replacing the cap and completing a few drive cycles.
P0447 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 P0447 mean on a Infiniti?
P0447 stands for "Evaporative Emission System Vent Control Circuit Open." This code means the engine computer detected an electrical open (broken or disconnected circuit) in the control wiring for the EVAP system's vent valve, which lets fresh air into the charcoal canister that captures fuel vapors. Because the computer can no longer command the vent valve to open or close, it cannot properly seal the fuel system to test for vapor leaks. This is an emissions and self-test issue rather than a safety or driveability problem, so the car generally runs fine but will fail an emissions test. On Infiniti it is documented across 1 model: FX50.
What are the most common causes of P0447?
The most common causes of P0447 are: Faulty EVAP vent valve/solenoid (internal electrical failure), Damaged, corroded, or disconnected wiring to the vent solenoid, Bad or loose electrical connector at the vent valve, Open circuit or chafed wire in the EVAP harness, Blown fuse feeding the vent control circuit, Vent valve clogged with dirt or debris, PCM/ECM driver fault (rare). The specific cause varies by vehicle.
How much does it cost to fix P0447 on a Infiniti?
Published repair estimates on Infiniti range from $40 to $450 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 P0447 on a different make?
View P0447 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.