P0447low severityPowertrain
Evaporative Emission System Vent Control Circuit Open
on 2017 Audi S5 3.0L Supercharged V6 · AWD
What this code means
The PCM detected an open circuit in the EVAP vent control valve. This prevents proper sealing and venting of the fuel vapor system.
Symptoms
- Check engine light on
- Failed emissions test
- No noticeable driveability change
Common causes
- Faulty vent control valve
- Open or broken wiring
- Corroded connector
- Failed PCM driver circuit
Diagnostic steps
- Retrieve code and freeze frame
- Inspect vent valve wiring and connector
- Test vent valve resistance and operation
- Verify PCM control signal
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