Cylinder 4 Above Knock/Combustion Vibration Sensor Threshold

Where it lives

For P2339, the part to look at first is the sensor named here. The description of P2339 puts it on cylinder 4.

Check these first

• Low octane fuel causing ping in cylinder 4
• Carbon deposits raising cylinder 4 compression
• A failed knock sensor reporting cylinder 4 knock
• An ignition timing error on cylinder 4
• A worn cylinder 4 spark plug or coil

What to do next

1. Read the knock counts for cylinder 4 on a scan tool
2. Check the freeze frame for the conditions when it set
3. Fill with the recommended octane fuel
4. Inspect the cylinder 4 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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