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uk Transport & mobility emergencies loud grinding noise in car • scraping sound under car • sudden metal on metal noise • new grinding from wheel • scraping after hitting something • dragging noise underbody • brake grinding sound • wheel bearing noise sudden • tyre rubbing wheel arch • undertray scraping road • car making horrible scraping noise • grinding when braking • grinding when turning • noise started suddenly while driving • stopped to check car noise • worried something is falling off • possible debris stuck under car • car unsafe to drive noise

What to do if…
you hear a loud new grinding or scraping noise and you have stopped in a safe place to check

Short answer

Treat a new loud grinding/scraping noise as a potential safety fault: don’t keep driving “to see if it goes away”. Stay safe, do a quick external check from a safe position, and if you can’t clearly identify a harmless cause, arrange assistance/recovery.

Do not do these things

  • Don’t keep driving at normal speed “just to get home” if the noise is loud, new, or getting worse.
  • Don’t put any part of your body under the car at the roadside (even briefly).
  • Don’t try roadside “repairs” on a motorway or other high-speed road.
  • Don’t place a warning triangle on a motorway.
  • Don’t touch a wheel, brake area, or anything near the exhaust if you suspect overheating (burn risk).
  • Don’t stand on the traffic side of the vehicle, or step into the carriageway to look/listen.
  • Don’t accept help from an unverified/unexpected “tow” vehicle you didn’t request—keep doors locked and verify first.

What to do now

  1. Lock in safety first. Hazard lights on. If you’re not fully safe where you’ve stopped (narrow hard shoulder, partly in a live lane, poor visibility, near a bend), call 999 and say you’re stopped in a dangerous position.
  2. If you’re on a motorway/smart motorway, use the motorway-specific help route.
    • If there’s a free emergency roadside telephone nearby (where provided), use it.
    • Otherwise, call National Highways on 0300 123 5000 for advice and assistance, then contact your breakdown provider.
    • If you cannot safely exit the vehicle or are in immediate danger, call 999 and ask for the police.
  3. Take 10 seconds to scan for “stop-now” signs (from a safe spot): smoke, burning smell, visible sparks, a rapidly deflating tyre, or a fluid pouring out.
    • If you see smoke/fire risk or suspect a fuel leak, move people away from the vehicle and call 999.
  4. Do a quick “walkaround” check without going near traffic. Use your phone torch:
    • Wheels/tyres: flat tyre, shredded sidewall, something trapped near a wheel.
    • Under edges of the car: something visibly dangling/dragging (plastic undertray/splash guard, loose heat shield, hanging trim).
    • Leaks: a fresh puddle or steady drip (especially with strong smell).
  5. Only if it’s genuinely safe, consider a 30–60 second “make it non-dragging” move.
    If you can clearly see a loose plastic panel/trim scraping the ground and you can reach it without going underneath, without stepping into traffic, and without going near hot parts, you may move it up/out of the way. If it’s not immediately safe and obvious, stop and get help.
  6. Decide “drive vs don’t drive” using a safety rule of thumb:
    • Do not drive if the noise is metal-on-metal, the car pulls to one side, braking feels different, steering feels wrong, a tyre looks damaged, there’s any smoke/burning smell, or you suspect a brake/wheel issue.
    • If the noise fully stops and you found an obvious harmless cause (e.g., a small stone fell out and nothing feels different), move off gently and head to the nearest safe place for a fuller check (not high speed).
  7. Share your exact location in a way responders can use. On major roads, note the road number, direction, nearest junction, and any driver location signs/marker posts. If your car has eCall/SOS, you can use it to get help.

What can wait

  • You don’t need to diagnose the exact fault right now.
  • You don’t need to choose a garage, agree repair costs, or make insurance decisions at the roadside.
  • You don’t need to decide whether to report anything unless there’s been a collision or clear damage—safety and getting off the road come first.

Important reassurance

A sudden grinding/scraping noise is exactly the kind of thing that makes people second-guess themselves. Treating it as “serious until proven otherwise” is a sensible safety-first response.

Scope note

These are first steps to keep you safe and prevent avoidable damage. A professional may still need to inspect brakes, wheels/bearings, undertrays, or the exhaust before the vehicle is driven normally again.

Important note

This is general information, not a diagnosis. If you feel unsafe where you’re stopped or you suspect fire, a fuel leak, or a dangerous road position, treat it as an emergency and call 999.

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