P0447 — Evaporative Emission Control System Vent Control Circuit Open
Category: Powertrain Severity: Low
Updated:
DTC code P0447 means: Evaporative Emission Control System Vent Control Circuit Open. 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
- Locate the vent valve.
- Check it's open when unpowered.
- Check whether the filter is clogged.
- 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 P0447 mean?
Evaporative Emission Control System Vent Control Circuit Open.
Is code P0447 serious?
Severity Low. Usually a minor fault; check the causes listed.
Can I keep driving with code P0447?
Yes, no risk; refueling may be difficult.
Related codes
P0446 P0449 P0443 P0442 P0441 P0440 P0452 P0453 P0455 P0456
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