P0448 Code: EVAP System Vent Control Circuit Shorted
🟠 Moderate severity · drivable
Drivable, but a stuck-closed vent valve can make the fuel tank hard to fill and may cause a fuel smell.
What P0448 means
The vent valve circuit has a short, drawing too much current. The valve may be stuck closed, which can create pressure in the fuel tank and make filling up harder.
Symptoms
- Check engine light is on
- Fuel tank hard to fill
- Possible fuel smell
- Usually no driving symptoms
Common causes
- most common: Short in the vent valve wiring
- common: Faulty vent valve
- less common: Damaged PCM driver circuit
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Inspect the wiring for shorts and repair as needed | Yes | $20–100 |
| Replace the vent valve | Yes | $30–120 |
| Have the PCM checked if wiring and valve are fine | Mechanic | $100–200 |
Frequently asked questions
Can I drive with a P0448 code?
Yes, but a stuck-closed vent valve can make the fuel tank hard to fill. Get it fixed before it causes more problems.
What does P0448 mean?
The vent valve circuit has a short, drawing too much current. The valve may be stuck closed, which can pressurize the fuel tank.
How much does it cost to fix P0448?
$30–120 for a new vent valve, or $20–100 for wiring repairs plus labor.
Related codes
P0447
P0447 Code: EVAP System Vent Control Circuit Open
P0446P0446 Code: Evaporative Emission Control System Vent Control Circuit Malfunction
P0455P0455 Code: Evaporative Emission Control System Leak Detected (Large Leak)
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.