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P0347 Camshaft Position Sensor B Circuit Low Input (Bank 2)

The OBD2 code P0347 indicates that the Camshaft Position Sensor B on Bank 2 is providing a low voltage signal, which may suggest a malfunction in the sensor, wiring, or related components

Definition

The OBD2 code P0347 indicates that the Camshaft Position Sensor B on Bank 2 is providing a low voltage signal, which may suggest a malfunction in the sensor, wiring, or related components

Common causes

  • Faulty camshaft position sensor
  • Damaged wiring or connectors
  • Poor electrical connection
  • Faulty engine control module (ECM)
  • Timing chain or belt issues
  • Oil contamination or low oil level
  • Faulty crankshaft position sensor
  • Mechanical engine problems (e.g., valve timing issues)

Common misdiagnoses

  • Faulty camshaft position sensor
  • Faulty crankshaft position sensor
  • Wiring issues or shorts in the sensor circuit
  • Engine control module (ECM) failure
  • Timing chain or belt issues
  • Oil flow problems affecting sensor operation
  • Incorrectly installed or damaged camshaft
  • Vacuum leaks affecting engine performance
  • Fuel delivery issues
  • Ignition system problems

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other trouble codes that may be present. This can provide additional context and help identify related issues

  2. 2. Inspect the Camshaft Position Sensor

    Visual Inspection: Check the sensor for physical damage, corrosion, or loose connections. Ensure that the wiring harness and connector are secure and free from damage

  3. 3. Sensor Location

    Confirm that you are checking the correct sensor for Bank 2, as some engines have multiple camshaft position sensors

  4. 4. Test the Sensor

    Resistance Test: Use a multimeter to measure the resistance of the camshaft position sensor. Compare the readings to the specifications in the vehicle’s service manual

  5. 5. Voltage Test

    Check the voltage supply to the sensor with the ignition on (engine off). You should see a reference voltage (usually around 5V) at the sensor connector

  6. 6. Signal Test

    With the engine running, check the output signal from the sensor. You should see a varying voltage signal as the camshaft rotates

  7. 7. Inspect Wiring and Connectors

    Wiring Inspection: Look for frayed wires, shorts, or open circuits in the wiring leading to the camshaft position sensor

  8. 8. Connector Inspection

    Ensure that the connectors are clean and free of corrosion. A poor connection can lead to low input signals

  9. 9. Check Engine Timing

    If the camshaft is out of alignment (due to a timing belt/chain issue), it can cause incorrect readings from the camshaft position sensor. Inspect the timing components for wear or damage

  10. 10. Test the Engine Control Module (ECM)

    If all other components check out, the issue may lie with the ECM itself. Ensure that the ECM is functioning properly and that it is receiving the correct signals from the sensor

  11. 11. Clear Codes and Test Drive

    After performing repairs or replacements, clear the trouble codes and take the vehicle for a test drive to see if the code returns

  12. 12. Seek Professional Help

    If you are unable to resolve the issue after these steps, it may be beneficial to consult a professional mechanic or technician who has experience with your specific vehicle make and model. By following these steps, you should be able to identify the cause of the P0347 code and take appropriate action to resolve it