P0390 — Camshaft sensor circuit problem on bank 2
The engine's computer detected an issue with the camshaft position sensor circuit on bank 2. This sensor helps the engine time fuel injection and ignition properly. The code appears when the sensor signal is missing, erratic, or out of expected range, often due to wiring or sensor faults.
Common causes
The cause is almost always one of a few things. Here they are — P0390 rarely comes from anything outside this list:
- Faulty camshaft position sensor on bank 2
- Damaged or corroded wiring/connectors in sensor circuit
- Timing chain or belt issues affecting sensor signal
- Engine control module (ECM) malfunction
- Oil contamination on sensor causing poor signal
Where to start
In the order a sensible mechanic would work — the cheap checks first, the expensive replacements only after:
- Inspect and clean sensor wiring and connectors
- Test sensor output and replace if faulty
- Check engine timing components for wear or damage
- Replace camshaft position sensor if needed
- Diagnose ECM only if all else checks out
That is what holds for P0390 in general. From here it depends on your engine — tell me which car it is and what it does, and I will give you the steps for it: real procedures, torque figures and diagrams instead of general advice.
Why TorqFix for your car?
Above is what the code means and why it appears. TorqFix goes further — it gives you specific procedures, torque values, wiring diagrams and pinouts for your exact engine, not generic steps for every car. Real workshop data (127,000+ diagrams, 10,000+ procedures), interpreted by AI in your language.
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Code breakdown
🔧 Related repair procedures
- AUDI: Removing timing chain from camshafts
- VW: Removing and installing timing chain and drive chain for oil pump
- AUDI: Removing camshaft timing chain from camshaft timing chain sprockets
- VW: Checking timing chain
- VW: Adjusting valve timing (installing timing chains)
- AUDI: Removing and installing camshaft timing chain - engine codes CAMA, CAMB, CCLA, CCWA, CCWB, CGKA, CGKB
- VW: Removing and installing camshaft timing chain and intermediate shaft drive chain
- AUDI: Checking timing chain
- AUDI: Removing timing chain (left-side) from camshafts
- VW: Installing camshaft adjuster with timing chain for camshaft drive
Who makes these pages, and how
TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.
The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.
The same code can mean different things on different makes. Match the meaning to your make before acting on it.
Seen a figure that does not match your manual? Write to us — we correct it and note when. support@torqfix.com
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