P0397moderate severityPowertrain
Camshaft Position Sensor B Circuit (Bank 2 or Single Sensor)
on 2009 Volkswagen CC 3.6L V6 · AWD
What this code means
The PCM detects a general circuit fault in the camshaft position sensor B for Bank 2. This affects valve timing feedback and engine synchronization.
Symptoms
- Hard starting
- Rough running
- Check engine light on
Common causes
- Faulty camshaft position sensor
- Wiring or connector damage
- Damaged reluctor wheel
- PCM circuit fault
Diagnostic steps
- Scan for cam sensor codes
- Inspect sensor wiring and connector
- Verify sensor air gap and tone ring
- Replace sensor if signal is faulty
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