OBD-II code · Powertrain (generic)
P0447 Evaporative Emission System Vent Control Circuit Open
The ECU detected an open circuit on the EVAP vent valve control. The vent valve is needed to seal the system for leak diagnostics; with the circuit open the leak test cannot complete.
Is it safe to drive with P0447?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyVent valve circuit open
- PossibleWiring or connector fault
- Less likelyPin pushed back out of connector body
Symptoms
- Check engine light on
- Possible smell of fuel near tank or engine bay
- Failed emissions inspection
- Loose-cap warning may appear
Repair at a glance
- Difficulty
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.3–1.5 h
- Emissions test
- Likely to fail
- Parts involved
- Evap Vent Valve, Vent Valve Wiring
Related codes
- P0444Evaporative Emission Purge Control Valve Circuit Open
- P0445Evaporative Emission System Purge Control Valve Circuit Shorted
- P0446Evaporative Emission Vent Control Circuit Malfunction
- P0448EVAP System Vent Control Circuit Shorted
- P0449Evaporative Emission System Vent Valve/Solenoid Circuit Malfunction
- P044AEGR Sensor C Circuit
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.