P0417low severityPowertrain
Secondary Air Injection System Switching Valve B Circuit Shorted
on 2009 Volkswagen CC 3.6L V6 · AWD
What this code means
The PCM detected a short in the secondary air injection switching valve B circuit. This affects air routing into the exhaust system.
Symptoms
- Check engine light on
- Failed emissions test
- Poor cold-start performance
Common causes
- Shorted valve B
- Grounded or chafed wiring
- Faulty valve solenoid
- Faulty PCM driver
Diagnostic steps
- Scan and confirm P0417
- Inspect wiring for shorts
- Measure valve resistance
- Verify PCM circuit
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