P0449 Code: Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction
🟢 Low severity · drivable
Safe to drive — this is an EVAP vent-valve fault, not an engine problem. Fix it before your next emissions test.
What P0449 means
There's an electrical fault in the EVAP vent valve circuit. This valve opens to let fresh air into the canister during a purge cycle.
Symptoms
- Check engine light is on
- Possible difficulty filling the fuel tank
- Usually no driving symptoms
Common causes
- most common: Faulty EVAP vent valve
- common: Damaged wiring or loose connector
- less common: Corroded vent valve connector
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Replace the EVAP vent valve | Yes | $30–150 |
| Repair damaged vent valve wiring | Mechanic | $50–150 |
Frequently asked questions
Can I drive with a P0449 code?
Yes. It's an emissions fault and won't affect drivability.
What is the most common cause of P0449?
A faulty EVAP vent valve.
How much does it cost to fix a P0449?
Typically $30–$150 for a new vent valve.
Related codes
P0446
P0446 Code: Evaporative Emission Control System Vent Control Circuit Malfunction
P0440P0440 Code: Evaporative Emission Control System Malfunction
P0455P0455 Code: Evaporative Emission Control System Leak Detected (Large Leak)
P0449 by vehicle brand
Causes and repair costs for P0449 differ between makes. Pick your brand for the specifics.
Toyota
P0449 on a Toyota
HondaP0449 on a Honda
FordP0449 on a Ford
ChevyP0449 on a Chevy
NissanP0449 on a Nissan
BMWP0449 on a BMW
Mercedes-BenzP0449 on a Mercedes-Benz
VolkswagenP0449 on a Volkswagen
HyundaiP0449 on a Hyundai
SubaruP0449 on a Subaru
MazdaP0449 on a Mazda
JeepP0449 on a Jeep
GMCP0449 on a GMC
LexusP0449 on a Lexus
VolvoP0449 on a Volvo
Related guide: How to Reset a Check Engine Light →
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.