P0448: How to Diagnose & Fix — Evaporative Emission System Vent Control Circuit Shorted
2 vehicles · 1 makes · $60-$900 repair
How to diagnose and fix P0448: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
Nissan Rogue · 2008–2013
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.
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)
Nissan Altima · 2007–2020
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, NTB17-082b) addressing the diagnostic path and this component; NTB17-082b covers a P0456 leak at the vent control valve O-ring.
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. If the leak is where the vent control valve mounts to the canister, Nissan NTB17-082b says not to replace the valve but to replace its O-ring seal; a valve that is itself sticking 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.
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Sources for this issue (3)
Find P0448 by make
Browse every documented model and issue for your make.
P0448 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 P0448 mean?
P0448 stands for "Evaporative Emission System Vent Control Circuit Shorted." This emissions code means the computer detected a short in the EVAP (evaporative emission) system's canister vent valve/solenoid control circuit: abnormally low voltage, a short to ground, or abnormal current draw where it expected the commanded signal. The vent valve controls how fresh air enters the charcoal canister and is part of how the system seals itself to test for fuel-vapor leaks. It's an electrical fault in the valve or its wiring, not a fuel or driveability problem. You typically won't feel any difference in how the car runs, but it will fail an emissions test and the system may not seal for leak checks.
What are the most common causes of P0448?
The most common causes of P0448 are: Failed EVAP vent valve/solenoid (shorted winding), Vent solenoid control wire shorted to ground or to another circuit, Corroded or water-damaged vent valve connector, Chafed harness near the canister (often under the vehicle), Faulty ECM/PCM driver circuit. The specific cause varies by vehicle.
How much does it cost to fix P0448?
Repair costs for P0448 range from $60 to $900, depending on the vehicle and root cause.
Which vehicles are affected by P0448?
Au7o has documented P0448 across 2 vehicle models from 1 manufacturers: Nissan.
Join 600+ people using Au7o to better understand their vehicles.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.