P0347 — Camshaft Position Sensor A Circuit Low (Bank 2)
High severityWhat it means
P0347 is stored when the engine control unit sees a fault involving the camshaft position (CMP) sensor circuit on bank 2. The camshaft position sensor lets the control unit identify which cylinder is on its firing stroke, which is needed for sequential injection and ignition. A “low” reading means the signal is stuck near the bottom of its range, which usually points to a short to ground or an internally failed sensor.
Common symptoms
- The live reading sits abnormally low or at zero
- Hard starting or long cranking
- Stalling or misfire
- Reduced power
Likely causes
- Signal wire shorted to ground
- Internally failed sensor pulling the signal low
- Faulty camshaft position sensor
- Timing chain/belt wear or a VVT issue affecting cam timing
What to check first
- Compare the live signal against a known-good range and check for a short to ground
- Inspect the sensor connector and wiring
- Check for cam/crank correlation codes and timing noise
Can you keep driving?
May cause hard starting or stalling; if it runs poorly or makes timing noise, avoid driving until checked.
Frequently asked questions
What is the most common cause of P0347?
The most likely cause is: Signal wire shorted to ground. Several other faults can set P0347 as well, so confirm the real cause with live data and the checks above before replacing any parts.
Can I just clear P0347 and keep driving?
Clearing P0347 with an OBD2 scanner turns the warning light off, but if the underlying fault has not been repaired the code will usually come back within a few drive cycles. Fix the cause first, then clear the code to confirm the repair worked.
How serious is P0347?
P0347 is a high-severity code. Diagnose and repair it as soon as possible, because continuing to drive can cause further damage or leave you stranded.
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