P0347
UniversalCamshaft Position Sensor A Circuit Low Input (Bank 2)
The engine controller monitors the electrical signal from camshaft position sensor A on Bank 2. This code means the signal is lower than expected; it does not prove the sensor itself has failed. Because camshaft position information helps the controller coordinate engine operation, the fault may affect starting, running, or power.
⚠️ Before You Begin (Safety First)
If the engine stalls, runs very roughly, loses power significantly, or the check-engine light flashes, stop driving when safe and arrange diagnosis. Otherwise, drive cautiously and have the fault checked soon, especially if symptoms develop.
Common Symptoms
- The check-engine light may be on, with no noticeable change in how the vehicle runs.
- The engine may take longer to start or may not start if the controller cannot use a reliable camshaft position signal.
- Rough running, hesitation, or reduced power may occur if engine control is affected.
- Stalling or misfires may occur in some cases, but these symptoms can have other causes.
Common Causes
- A faulty camshaft position sensor A on Bank 2 may produce an abnormally low signal.
- Damaged wiring or a poor connection in the sensor circuit may reduce or interrupt the signal.
- A circuit short to ground, or a problem with the circuit's power or ground where applicable, may cause a low input.
- A problem with the camshaft sensing target or engine timing may affect the signal and should be considered if circuit checks do not explain the code.
- A related connector, wiring, or engine-control issue may be responsible; the code alone does not identify the failed part.
Diagnostic Steps
- Record the code and any other stored codes before clearing anything; related codes can help direct diagnosis.
- Note whether starting, idle, power, or stalling symptoms are present, and avoid driving if the engine is unsafe or unreliable.
- With the engine off, visually inspect accessible sensor wiring and connectors for looseness, corrosion, chafing, or visible damage. Do not pull on wires or work near hot or moving parts.
- Check the owner's manual for any model-specific guidance and arrange professional testing if the code returns or wiring damage is not obvious.
- Do not replace the sensor based only on this code; confirm the cause with vehicle-specific circuit tests.
When to Call a Professional
A technician can review related codes and scan data, then use the vehicle-specific wiring diagram to check the sensor circuit, including its power, ground, and signal as applicable. If the electrical checks do not identify the cause, further signal analysis and inspection of the camshaft sensing target or engine timing may be needed. Test procedures vary by model, year, and engine.
Compare component listings
Confirm diagnosis and vehicle fitment before buying. A listing does not prove that a part needs replacement. We may earn a commission from qualifying purchases.
Commonly Asked Questions
Does P0347 prove the camshaft position sensor needs replacement?
No. It reports a low input in the Bank 2 sensor A circuit. Wiring, connections, power or ground issues, and other signal-related problems can also cause the condition.
What does Bank 2 identify?
It identifies the engine bank designated Bank 2. The exact sensor location depends on the vehicle's engine layout, so use model-, year-, and engine-specific service information.
Can I keep driving with P0347?
It depends on how the engine runs. If it stalls, runs very roughly, loses substantial power, or the check-engine light flashes, stop when safe and arrange diagnosis. If there are no symptoms, have it checked soon and watch for changes.
How is a low-input circuit fault diagnosed?
A technician checks related codes and scan data, then tests the sensor circuit using vehicle-specific information. Further signal or mechanical checks may be needed if the circuit tests do not reveal the cause.
Browse Available Code Guides
Previous and next available guides in database record order, across makes. Adjacent entries may share a code number and do not necessarily describe related faults.