Why Is My Car Making a Knocking Noise?
- Tyler Ellis
- Sep 10
- 2 min read
Why Your Car Might Be Making a Knocking Noise
Hearing a knocking sound from your vehicle can be alarming, especially if it happens often or gets louder with time. Many drivers ask, “Why is my car making a knocking noise?”, and the answer can range from minor issues to serious engine trouble. Knowing what’s causing the noise can save you from costly repairs down the road.
At Round Rock Auto Center, we help drivers track down knocking sounds and fix them before they become major problems.
Common Causes of Knocking Sounds
Knocking noises can come from different parts of your vehicle, and each has its own meaning:
Engine detonation (spark knock) – Happens when fuel burns unevenly inside the cylinders, often caused by low-quality gas, incorrect timing, or carbon buildup.
Worn engine bearings – A deep knocking noise from the engine bottom may indicate worn crankshaft bearings, which require immediate attention.
Loose or damaged suspension parts – Knocking when going over bumps could point to bad struts, shocks, or bushings.
Worn CV joints – Clicking or knocking while turning often means CV joint wear.
Loose heat shields or exhaust components – Metal rattling or knocking under the car can come from exhaust parts vibrating.
How to Narrow Down the Noise
Pay attention to:
When it happens – During acceleration, idling, or while turning?
Where it comes from – Under the hood, near the wheels, or underneath the car?
The type of knock – Sharp metallic taps vs. deep engine thuds help identify the cause.
Why You Shouldn’t Ignore Knocking
Leaving a knocking noise unchecked can:
Lead to major engine damage if it’s bearing or detonation related.
Cause suspension failure if parts are loose or broken.
Create safety hazards if steering or drivetrain parts are the source.
How We Fix Knocking Noises at Round Rock Auto Center
When you bring your vehicle to Round Rock Auto Center, we:
Listen carefully to replicate and identify the sound.
Inspect the engine, suspension, and exhaust system.
Run diagnostic checks if engine-related.
Repair or replace worn components.
Road test to confirm the knock is gone.
Quiet Down That Knocking Noise
If you’ve been wondering why your car is making a knocking noise, don’t wait until it turns into a bigger problem. Contact Round Rock Auto Center today to schedule an inspection and let our ASE-certified team take care of it.
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