Can drive — fix at your convenience.
This code means the computer detected a short circuit in the wiring or solenoid for the EVAP vent control valve. This valve seals the EVAP system and lets the charcoal canister draw in fresh air. Fixing it usually means replacing the vent valve or repairing shorted or chafed wiring and connectors, and it's typically a low-cost repair.
$100 – $280
Varies by vehicle and root cause.
Yes, in most cases. The car runs normally because this is an emissions-only fault. Still, fix it reasonably soon since a short can sometimes affect nearby wiring, and it will cause an emissions-test failure.
Typically $100 to $280. The vent valve is inexpensive, and most of the cost is labor based on its location. If the issue is just a shorted wire, the repair can be cheaper.
No, it's low-severity. It won't damage your engine or affect driving safety. The main concerns are the check engine light and failing emissions testing until it's repaired.
A short often comes from wiring that has rubbed through its insulation, a connector exposed to moisture, or a failed solenoid inside the valve. The computer detects abnormal current flow and stores P0449.