Typical repair cost: $50–$8,000
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Low-octane fuel, carbon buildup, or advanced timing — heard under load. Triggers knock-sensor codes like P0325.
Bottom-end bearing failure. Deep, rhythmic — every other RPM. Engine teardown territory.
Cold-start knock that quiets as the piston warms and expands. Often livable.
Common on GM 5.3L V8s — collapsed lifter from active fuel management.
Slap against guide — usually accompanied by P0008/P0016.
Bottom-end knock means stop driving. Pinging under load can be temporarily fixed with higher octane until diagnosed.
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