OBD
P0447
EVAP System Vent Control Circuit Open
What it means
P0447 means EVAP System Vent Control Circuit Open.
Check these first
- An open in the EVAP vent control circuit
- A failed canister vent valve
- Corrosion at the vent valve connector
- A blown vent valve fuse
- A clogged vent filter
What to do next
- Check the vent valve fuse first
- Test the vent valve winding resistance
- Check the vent circuit for an open
- Inspect the vent valve connector for corrosion
- Replace the vent valve or clear the vent filter
- Clear the code and retest
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Updated
Generic SAE J2012 definition. Last updated 2026-10-10.