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What causes the sound of metal scraping the ground when the car is running?

2 Answers

DelAva

07/29/25 5:02am

There are several reasons why a car may produce a sound similar to metal scraping the ground: 1. First, if the underbody cover becomes loose, the underbody guard plate may continuously scrape against the ground while driving, creating a noise resembling dragging metal. 2. Secondly, if the ceramic filter inside the catalytic converter breaks, the shattered ceramic pieces may continuously collide with the metal shell of the catalytic converter during vehicle movement, resulting in various metal knocking and dragging sounds. 3. Additionally, similar noises can be caused by loose brake discs, transmission abnormalities, or excessive wear of the half-shaft.

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Faunus

08/12/25 8:40am

I've also heard this kind of metal scraping sound while driving. At first, I didn't pay much attention, but later I found out it was the loose underbody protection panel. I remember once after driving on a muddy road after rain, the panel got deformed and detached after being hit by rocks, and then the screws loosened, causing it to drag and make noise all the time. Other common issues include displaced exhaust pipe heat shields and detached brake component casings. In such cases, it's best to stop immediately, turn on the hazard lights, find a safe spot to get down and check the underbody, using a flashlight to see if there's anything obviously hanging down. I once dealt with it myself by temporarily tightening it with a wrench, which reduced the noise, but it's not a long-term solution as it may continue to wear out, potentially leading to oil pan leaks or brake line damage, increasing the risk of accidents. It's advisable to go to a repair shop for a thorough inspection with a lift, and also to regularly clean debris from the underbody during maintenance to avoid similar troubles.

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Can someone else deduct points if I lost my driver's license?

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