P0449 — Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction
Category: Powertrain Severity: Low
Updated:
DTC code P0449 means: Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction. It falls under the "Powertrain" category, with an estimated severity of Low. Common causes include faulty EVAP purge valve or solenoid, faulty EVAP vent valve and faulty fuel tank pressure sensor; it's worth confirming the diagnosis before replacing parts.
Possible causes
- Faulty EVAP purge valve or solenoid
- Faulty EVAP vent valve
- Faulty fuel tank pressure sensor
- Wiring/connector issue
Symptoms
- Usually only the check engine light, no drivability symptoms
- Occasional slight fuel smell
- Possible failed emissions test
How to diagnose it step by step
- Check the vent valve connector (under the car).
- Measure resistance.
- Check the fuse.
- Replace the valve.
How to fix it
Test the purge and vent valves/solenoids for proper operation (they should click and hold vacuum when commanded); check the fuel tank pressure sensor and its wiring if the code points there. Most EVAP faults are inexpensive to fix.
Estimated repair cost
$40–150.
Frequently asked questions
What does DTC code P0449 mean?
Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction.
Is code P0449 serious?
Severity Low. Usually a minor fault; check the causes listed.
Can I keep driving with code P0449?
Yes, no risk.
Related codes
P0447 P0446 P0443 P0442 P0441 P0440 P0452 P0453 P0455 P0456
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