P0390
PowertrainCrankshaft Camshaft Positionmoderate severityCamshaft Position Sensor B Circuit (Bank 2)
What P0390 Means
The PCM detects a fault in the Bank 2 camshaft position sensor B circuit. This can affect timing accuracy and fuel/spark synchronization on that bank.
Symptoms
- Hard starting
- Rough running or stalling
- Check engine light on
Common Causes
- Faulty camshaft position sensor
- Damaged sensor wiring or connector
- Bad reluctor/tone wheel
- PCM circuit fault
Diagnostic Steps
- Scan for related cam/crank codes
- Inspect sensor and connector on Bank 2
- Check sensor air gap and tone ring
- Test signal with scope, replace if faulty
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