P0347

What it means

P0347 means the engine control unit has detected a low voltage signal in the camshaft position sensor 'A' circuit on bank 2, the side of the engine that does not contain cylinder number one. The control unit saw the sensor signal sitting at or near zero volts, or below the expected range, while the engine was cranking or running. Which camshaft (intake or exhaust) is 'A' depends on the engine and layout, so check the model-specific information.

Symptoms

• Engine management light on
• Long cranking or extended starting time
• Engine fails to start in some cases
• Rough running or misfire
• Loss of power or reduced performance, possibly limp mode
• Poor fuel economy

Possible causes

• Damaged, chafed or broken wiring in the sensor signal, supply or ground circuit (short to ground or open circuit)likely
• Faulty bank 2 camshaft position sensorlikely
• Corroded, loose or contaminated connector at the sensor or control unitlikely
• Sensor supply voltage missing or low due to a fault in the reference supply circuitpossible
• Damaged or contaminated reluctor wheel or target, or incorrect air gap or sensor fittingpossible
• Incorrect camshaft timing, such as a stretched chain or jumped beltrare
• Fault in the engine control unitrare

How to diagnose

1. Read all stored and pending codes and the freeze frame data, noting engine speed, temperature and load when the code set, and look for related crankshaft or other camshaft sensor codes.
2. Visually inspect the bank 2 camshaft sensor, its wiring and the connector for chafing, oil contamination, heat damage, corrosion and a secure fit.
3. Check the wiring routing near the cylinder head and any moving or hot components for rubbing or damage.
4. With the ignition on, measure the sensor supply and ground at the connector against the manufacturer's specification for that engine.
5. Check the signal circuit for continuity, and for shorts to ground or to other wires, with the control unit and sensor disconnected.
6. Check the live data for camshaft and crankshaft signal presence and correlation while cranking, and view the waveform with an oscilloscope if available.
7. Remove the sensor and inspect it and the reluctor wheel for damage, debris or metal build-up, and check it is seated correctly.
8. If the signal is correct but the code remains, check the cam timing against the manufacturer's procedure, and check the control unit power, grounds and software status.

How to fix

• Repair or replace damaged wiring and repair any short to ground or open circuit in the sensor circuit.
• Clean, repair or replace corroded or loose connectors and terminals.
• Replace the bank 2 camshaft position sensor if it fails testing, using the correct part for the engine.
• Correct the sensor fitting or air gap, and replace a damaged reluctor wheel or target.
• Correct the camshaft timing and replace worn timing components if the timing is found to be out.
• Repair or replace the control unit only after all other causes are ruled out and the fault is confirmed.

Can I keep driving?

Nearby codes

• P0346GenericCamshaft Position Sensor A Circuit Range/Performance Bank 2
• P0348GenericCamshaft Position Sensor A Circuit High Bank 2