Typical repair cost: $50–$8,000
Run your why is my engine knocking? jobs in Repairius.
Estimates, text approvals, invoices and payments in one place, with unlimited users. Need a shop instead? Browse local providers and call them directly.
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.
Doing it yourself? Shop our partners
We may earn a small commission from partner links — it never changes the price you pay.
Repairius keeps estimates, work orders, real-time job assignment, customer and vehicle history, inventory, and payments in one place — on desktop and in your pocket.
14-day free trial · credit card required · cancel anytime
Not a mechanic? Send Repairius to your shop — they can run estimates, jobs, and invoices in one place.
Share this page with a mechanic, a shop owner, or a friend working on the same problem.