Engine

P0347 — Camshaft Position Sensor A Circuit Low (Bank 2)

Severity: medium Drive with care, to a shop

What P0347 means

The engine control module is receiving too low a voltage or a weak signal from camshaft position sensor A on bank 2. The ECM uses this signal together with the crankshaft sensor to know engine phase and time fuel injection and spark. When the signal is low or missing, timing control suffers and the engine runs poorly.

Symptoms

  • Check Engine light on
  • Rough idle or misfire-like running
  • Hard or extended cranking before starting
  • Hesitation and reduced power
  • Engine stalling

Possible causes

  1. Failed bank 2 camshaft position sensor A
  2. Open, shorted or chafed wiring harness
  3. Signal wire shorted to ground
  4. Corroded or loose connector
  5. Damaged reluctor or tone ring, or incorrect cam timing
  6. ECM input circuit fault (rare)

How to diagnose

  1. Scan for codes and freeze frame data, and look for related cam or crank sensor codes
  2. Inspect the bank 2 sensor connector and harness for chafing, oil, corrosion or heat damage
  3. Check sensor power and ground with a multimeter, following the vehicle's wiring diagram
  4. Test the signal wire for opens and shorts to ground with the connector unplugged
  5. View the sensor signal on a scope while cranking
  6. Inspect the tone ring and verify cam timing marks and phasing
  7. If the sensor and wiring test good, evaluate the ECM and its circuits

Common fixes

  • Replace the bank 2 camshaft position sensor A
  • Repair or replace the damaged wiring or connector
  • Clean the connector terminals and secure the plug
  • Correct mechanical issues such as the tone ring, timing belt or chain
  • Replace or reprogram the ECM if it is confirmed faulty

Questions and answers

What does P0347 mean?

It means the signal from camshaft position sensor A on bank 2 is too low. The cause is usually the sensor itself or its wiring.

Can I drive with P0347?

Only briefly and carefully, on the way to a repair. The engine may stall or fail to restart, so don't delay the fix.

Will replacing the sensor fix it?

Not always. Check the connector and wiring for opens and shorts first, or a new sensor may set the same code.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.