Cylinder 12 Above Knock/Combustion Vibration Sensor Threshold

Where it lives

For P2347, the part to look at first is the sensor named here. The description of P2347 puts it on cylinder 12.

Check these first

• Low octane fuel knocking in cylinder 12
• Carbon buildup raising cylinder 12 compression
• A faulty knock sensor misreporting cylinder 12
• Over-advanced ignition timing
• A fouled cylinder 12 spark plug

What to do next

1. Read the knock sensor data on a scan tool
2. Look for accompanying misfire codes
3. Fill with the recommended octane fuel
4. Inspect the cylinder 12 spark plug and ignition coil
5. Test the knock sensor and wiring if no knock is present
6. Clear the code and retest

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