P0347 critical

Camshaft Position Sensor A Circuit Low (Bank 2)

The P0347 code means the vehicle's onboard diagnostic system has detected: Camshaft Position Sensor A Circuit Low (Bank 2). This is a critical severity code.

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Keep driving?: Short distances only
DIY difficulty: moderate
Estimated cost: $80 - $350 (parts and labor)

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Common Symptoms

Engine cranks with extended start time
Engine stalls or runs rough
Check Engine Light illuminated
Misfires on bank 2 cylinders
Reduced power from bank 2

Probable Causes (Ranked by Likelihood)

Short to ground in bank 2 CMP sensor wiring Very High
Faulty camshaft position sensor on bank 2 High
Corroded or oil-contaminated sensor connector High
Damaged wiring near valve cover or timing cover Moderate
PCM input circuit fault Low

Step-by-Step Diagnostic Procedure

Check bank 2 CMP sensor signal voltage -- consistently low readings confirm a circuit fault
Test for shorts to ground in the signal wire with sensor disconnected
Inspect the connector for oil contamination from valve cover gasket leaks
Check the 5V reference voltage at the sensor connector
Replace the sensor if output tests low after wiring checks pass

Frequently Asked Questions

Can I drive with code P0347?

You can drive short distances. The engine may run on bank 1 CMP data with bank 2 defaulting to batch-fire injection, causing rough running on bank 2 cylinders.

Can a valve cover gasket leak affect the bank 2 CMP sensor?

Yes. Oil from a leaking valve cover gasket can travel along the wiring and into the CMP sensor connector, shorting the signal to ground.

Is the bank 2 CMP sensor the same part as bank 1?

In many cases, yes. The same sensor part number may be used on both banks. However, always verify with your vehicle's parts catalog as some engines use different sensors per bank.