Scraped Bottom of Car Now Making Noise: 12 Possible Causes

There’s that moment of sheer panic when you hear the unsettling sound of metal grazing against a hard surface as you drive over a curb. 

You cringe, your heart skips a beat, and a barrage of questions floods your mind. “What was that noise? How severe is the damage? What should I do now?” 

First and foremost, take a deep breath. 

We understand your concern and are here to help guide you through this.

Often, the causes of unwanted noise in your car after scraping it on a curb include a damaged exhaust system, a dislodged heat shield, or suspension issues. Debris might also become lodged in tight spots, or the impact might have bent a wheel rim. Whatever the cause, it’s crucial to identify it.

In this guide, we’ll provide you with possible reasons why your car is making that unsettling noise. We’ll also offer insights on addressing it and recommendations on prevention to ensure it doesn’t become a frequent occurrence.

So, unbuckle that seatbelt of yours; it’s time to get down and dirty to check what’s causing that particular issue.

Let’s get right to it.

What are the Potential Causes of Rattling Noise After Hitting a Curb?

Here are some potential causes that might result in your car producing these unsettling noises:

1. Damaged Exhaust System

One of the common reasons for a terrible noise after scraping the bottom of your car is the exhaust hitting a raised block or speed bump can lead to dents or disconnections, causing a noticeable change in sound.

The underside of most cars often houses parts of the exhaust system, which is susceptible to damage upon impact. A minor dent, a crack, or even a dislodged exhaust hanger can make the entire system rattle.

2. Damage to the Engine Mounts

Engine mounts are critical in keeping the engine stable. Hitting a speed bump or a curb too hard can damage these mounts, leading to a rattling noise that’s especially prominent near the center console.

3. Loose or Dislodged Heat Shield

Directly related to the exhaust system, the heat shield is designed to protect your car from the heat generated by the exhaust. If it becomes loose or bent because of the impact, it can produce a metallic rattling sound, especially during acceleration.

4. Suspension Damage

The car’s suspension components are in proximity to the ground, making them vulnerable when grazing a curb. Bent control arms, damaged bushings, or even a misaligned strut can create various unsettling sounds.

5. Damage to Undercarriage Covers and Shields

Many modern cars come equipped with plastic undercarriage covers to improve aerodynamics and protect against debris. If these get torn, cracked, or even partially dislodged due to the impact, they can flap or vibrate at speed, leading to a variety of noises.

6. Debris or Foreign Objects

Post-impact, it’s possible for small rocks, debris, or other foreign objects to become lodged in nooks or crannies, particularly between the brake rotor and the protective shield. This can create a consistent scraping or grinding noise.

7. Damage to Oil Pan

Though made sturdy, a direct and forceful impact can dent or even crack the oil pan. At the same time, a crack might lead to oil leaks, and a dent, particularly if close to moving parts, could produce noise.

8. Bent Wheel Rims or Damaged Wheel Hub

If the impact with the curb was on the side, it’s possible to bend the wheel rim or even damage the wheel hub, leading to noises, especially when the car is in motion.

9. Transmission Fluid Leaks

If your car starts making a ticking noise after a scrape, it could be due to transmission fluid leaks. Striking a speed bump harshly can damage the transmission system, causing fluid leaks and resulting in inadequate lubrication.

10. Compromised Cross Member

The cross member, part of the car’s frame, can get bent or damaged when hitting a curb. This damage can lead to other components of the car becoming misaligned, thus producing various noises.

11. Gravel or Debris Stuck

Sometimes, the noise might be due to something as simple as gravel stuck in the undercarriage. This is common if you’ve driven over a gravel-filled area or a poorly maintained road with lots of debris.

12. Drive Train Damage

The drive train encompasses several components that can be affected by scraping the bottom of your car. Damage here can cause a range of sounds, from grinding to rattling, indicating severe issues.

TRY CHECKING: I Struck the Curb with My Front Right Side

What To Do After You’ve Scraped The Bottom Of Your Car, And Now It’s Making Noise

Now that we understand the potential reasons why the bottom of your car is making noises after being scraped, let’s explore the steps you can take to fix it.

Assess the Damage Yourself

Before panicking or rushing to a mechanic, take a moment to inspect the damage visually. This doesn’t require any expertise. Simply find a safe spot, get down, and have a look at the underside of your car.

Check for any visible leaks or damages under the car, and look for dents, loose parts, or any foreign objects stuck. While this won’t give you a complete diagnosis, it provides a general idea of the extent of damage.

Remove Foreign Debris

Stones, twigs, or other debris stuck, especially in the wheel arches or between brake rotors, can cause noise. Ensure you remove these obstructions promptly to prevent any further damage.

Check for Loose Pieces

After a significant curb scrape, parts of your vehicle’s undercarriage or protective shields might become loose or dislodged. It’s essential to secure or replace these promptly, ensuring they don’t fall off while driving or lead to further complications.

Address Wheel and Suspension Concerns

These components might need realignment or repair if the impact was significant enough to affect the wheels or suspension. This not only addresses the noise but also ensures safe and smooth driving.

Seek Exhaust Repair if Needed

If you’ve identified or suspected damage to the exhaust system, consider visiting an exhaust-specialized repair shop. They can provide tailored solutions, whether it’s welding a cracked pipe or securing a loose heat shield.

Avoid Further Damage

Until the issue is resolved, avoid driving over speed bumps or rough terrains. Further strain could exacerbate the problem.

Visit a Trusted Repair Shop

Regardless of whether you’ve identified the cause of the noise under your car, it’s best to consult a professional about this issue. Take your vehicle to a trusted repair shop where experts can thoroughly inspect and pinpoint the exact problem, ensuring nothing is overlooked.

Conclusion

While some of these causes might seem minor, it’s essential to address any unusual sounds promptly. Ignoring them can escalate into more severe issues, both for your vehicle and your wallet. 

To safeguard your vehicle from future curb-related mishaps, consider investing in preventative measures. 

A quality curb ramp, like Smooth Curb – Driveway Curb Ramp, can significantly reduce the chances of undercarriage damage by providing a smoother transition when approaching or leaving a driveway. By incorporating such tools, you not only protect your car but also ensure peace of mind each time you navigate those tricky curbs.

If you’re interested in learning more about this topic, check out our other posts in the blog section. Our main priority is to educate you on the negative effects that curbs can have on both you and your vehicle.

So, the next time you want to avoid scraping the bottom of your car because of a curb, consider investing in Smooth Curb for a worry-free transition every single time.

FAQs

Have additional questions about why your car’s making noises after scraping the bottom? We might have answered them in our FAQs below.