P0448 on Ford
Evaporative Emission Control System Vent Valve/Solenoid Circuit Open
P0448 on Ford vehicles indicates evaporative emission control system vent valve/solenoid circuit open. Au7o has documented this code across 1 Ford model — most commonly on Focus. 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. Typical repair costs on Ford range from $80 to $250, depending on the specific model and root cause.
Common Causes of P0448
- •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
P0448 on Ford by Model
Ford Focus(1 issue)
- Canister Purge Valve Failure Causing Rough Idle and Stalling2012-2018
The 2012-2018 Ford Focus with the 2.0L GDI engine experiences frequent canister purge valve (CPV) failures that cause rough idle, stalling, difficulty starting (especially after refueling), and fuel-related DTCs. The purge valve sticks open, allowing fuel vapors to flood the intake manifold at inappropriate times. This is separate from the carbon buildup issue and is one of the most commonly replaced components on the 2012-2018 Focus. Ford issued TSBs addressing the issue and released updated purge valve designs. The problem affects both manual and automatic (PowerShift) transmission models. Focus Fanatics Forum documents this as one of the top five most-replaced parts on the Mk3 Focus.
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View P0448 across all makes →Frequently Asked Questions
What does P0448 mean on Ford?▼
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. On Ford specifically, this code is documented across 1 model.
What causes P0448 on Ford vehicles?▼
Common causes on Ford: 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). Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0448 on a Ford?▼
Repair costs on Ford range from $80 to $250, depending on the specific model and root cause.
Which Ford models have P0448 documented?▼
Au7o has documented P0448 on 1 Ford model: Focus.