P1425low severityPowertrain
Tank Vent Valve Short to Ground
on 2017 Audi A8 4.0L Twin-Turbo V8 · AWD
What this code means
The ECU detected a short to ground in the tank vent valve circuit. This valve controls airflow into the EVAP canister and its malfunction affects fuel vapor management.
Symptoms
- Check Engine Light
- Fuel vapor odor
- Failed emissions test
Common causes
- Wiring shorted to ground
- Faulty tank vent valve
- Connector damage
- Water intrusion at connector
Diagnostic steps
- Test vent valve resistance
- Inspect wiring for ground shorts
- Check connector for water intrusion
- Test ECU driver output
Repair notes
Repair the wiring short to ground or replace the tank vent valve.
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