Noises

Rattling noise from underneath the car

A rattle from beneath the vehicle is very commonly a loose heat shield around the exhaust system, though it can also come from other loose components underneath, especially over bumps or at certain speeds.

Difficulty
Easy
Time
20–40 minutes
DIY cost
$5–$40
Pro cost
$50–$200

Symptoms

  • Rattling or buzzing sound from underneath the car
  • Often worse over bumps or at idle
  • May come and go depending on speed or engine vibration
  • Sound seems to come from the exhaust area rather than the wheels

Likely causes

  • CommonLoose exhaust heat shieldThin metal heat shields commonly rust and loosen, rattling against the exhaust pipe or body.
  • PossibleLoose exhaust hanger or clampA worn rubber hanger can let the exhaust system shift and rattle against nearby parts.
  • PossibleLoose splash shield or underbody panelPlastic underbody covers can crack or lose fasteners and flap or rattle.
  • PossibleSomething caught underneath the car (debris)Sticks, plastic bags, or road debris can get lodged and rattle around.
  • Less commonLoose suspension component (less common for a simple rattle)Usually causes a clunk rather than a light rattle, but worth ruling out.

What to do

  1. Have someone gently shake or tap on visible heat shields, panels, and exhaust components (only with the engine off and cool) to see if you can recreate the rattle.
  2. Look for anything obviously dragging, cracked, or dangling underneath the car, including plastic splash shields.
  3. Check exhaust hangers (the rubber loops holding the exhaust pipe) for cracking or looseness.
  4. Drive slowly over a bump if safe to do so and note whether the rattle matches what you hear underneath.
  5. If you find a loose heat shield, sometimes it can be temporarily secured with high-temperature clamps or wire until properly repaired.
  6. Check for any debris lodged near the exhaust or underbody that could be causing the noise.
  7. Have a mechanic put the car on a lift to visually inspect the entire underside if you can't identify the source from the ground.
  8. Get a loose heat shield or exhaust hanger fixed promptly, since it's usually inexpensive and prevents the rattle from worsening or the part falling off.

Tools and parts

  • Flashlight
  • Jack and stands (for a closer look, if comfortable)
Exhaust heat shield clamp or hardwareSearch: “exhaust heat shield repair clamp”
Exhaust hangerSearch: “exhaust hanger for [year make model]”

When to call a pro

If you can't locate or reach the loose part yourself, a shop can quickly find and secure it on a lift.

Safety

Use caution

Only inspect underneath a cooled, parked vehicle, and use proper jack stands rather than relying on a jack alone if you need to look underneath.

Related guides

Operator provides AI-generated troubleshooting information. It can be wrong. For safety-critical, electrical, gas, structural, medical, automotive safety, or other high-risk problems, consult a qualified professional.