Cylinder 5 Above Knock/Combustion Vibration Sensor Threshold

Where it lives

For P2340, start at the sensor the description names. The description of P2340 puts it on cylinder 5.

Check these first

• Low octane fuel causing knock in cylinder 5
• Carbon buildup raising cylinder 5 compression
• A faulty knock sensor picking up false vibration
• Ignition timing too far advanced
• A loose cylinder 5 spark plug

What to do next

1. Read the knock sensor data and cylinder 5 knock counts on a scan tool
2. Check for other misfire codes
3. Fill with the recommended octane fuel
4. Inspect the cylinder 5 spark plug and ignition coil
5. Test the knock sensor circuit if the knock is not real
6. Clear the code and retest

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