P0448: Evaporative Emission Control System Vent Valve/Solenoid Circuit Open
2 vehicles · 2 makes · $80-$900 repair
Most Reported On
P0448 is an OBD-II diagnostic trouble code meaning “Evaporative Emission Control System Vent Valve/Solenoid Circuit Open.” This emissions code indicates the EVAP (evaporative emission) system's vent valve/solenoid circuit is reading as electrically open. 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. When the computer commands the vent solenoid but its circuit stays open (no continuity), this code sets — 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 may not seal for leak checks. This code is most commonly reported on 2012-2018 Ford Focus, and 2008-2013 Nissan Rogue, with repair costs ranging from $80 to $900.
Common Causes
Typical Repair Cost
Based on 2 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose P0448, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
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FAQ
What does P0448 mean?
P0448 stands for "Evaporative Emission Control System Vent Valve/Solenoid Circuit Open." This emissions code indicates the EVAP (evaporative emission) system's vent valve/solenoid circuit is reading as electrically open. 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. When the computer commands the vent solenoid but its circuit stays open (no continuity), this code sets — 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 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 (open winding), Open or broken wiring in the vent solenoid circuit, Corroded or disconnected vent valve connector, Poor power or ground feed to the solenoid, Damaged harness near the canister (often under the vehicle), Blown fuse supplying the EVAP solenoid, 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 $80 to $900, depending on the vehicle and root cause.
Which vehicles are affected by P0448?
Au7o has documented P0448 across 2 vehicle models from 2 manufacturers: Ford, Nissan.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.