A car humming at high speeds is not normal. While highway driving can lead to louder road noise, or roads under construction can change the pitch of the ambient noise, a car consistently humming at high speeds means something is wrong.
For most drivers, a car’s hum starts low but gets louder when accelerating or going faster. This is a telltale way to know something is wrong with your car, and you need a fix. If you notice your car humming at high speeds, there are 3 common causes that can be fixed to reduce the noise and improve the safety of your drive.
If you’re worried about your car, contact Hoffmaster’s Auto Care in Silver Spring, MD for auto repairs. We can assist with diagnostics, repairs, and honest estimates. When something is going on behind the wheel, we can help.
1. Worn Wheel Bearings
Wheel bearings are what allow your tires to spin while still bearing the weight of the vehicle. For most cars and trucks, wheel bearings can last a lifetime without any issues. However, if they start to wear, they can create a low hum that sounds similar to a growl or buzzing noise.
As wheel bearings wear down from normal use, they create friction. The humming sound at high speeds will also be noticeable when turning. For most drivers, the first fix for humming at high speeds is to rotate the tires, but a worn wheel bearing will continue to cause loud noises even after this fix.
A local auto shop can remove your tires, visually inspect the wheel bearings, and confirm they need to be replaced. If you do not replace a worn wheel bearing, you can have worsening steering issues or loss of control entirely. The cost of replacing a worn wheel bearing includes the cost of the part (a couple of hundred dollars, which may vary) and shop labor. Hoffmaster’s Auto Care can offer diagnostics and an honest estimate before any work begins, to ensure we have the right cause and an affordable solution.
2. Uneven Tire Wear or Tire Pressure
The most common reason your vehicle is humming at high speeds is because your tires are wearing unevenly. Most tires wear unevenly due to the nature of more right turns vs left turns, divots on the right side of the road, and more. This is why tire rotations are encouraged as part of your annual vehicle maintenance.
If you neglect your tire rotations for too long, they will wear unevenly, so much so that they produce a noticeable humming. The noise may sound like a droning and will increase at higher speeds. Sometimes one tire is severely deflated compared to the others, and this can be the fix. Most often, however, the tires need to be rotated.
Hoffmaster’s Auto can provide a quick tire rotation plus visual inspection to ensure there is no other reason for the vehicle’s loud humming noise. A wheel alignment may also help. In severe circumstances, a tire replacement is needed because the tire wear is so uneven and poses a safety risk on the road.
3. Wheels Are Out of Alignment
Wheels go out of alignment due to uneven tire tread or rough road conditions, like potholes, minor collisions, and even road work. Once the wheels are out of alignment, they can create an increase in road noise that grows louder as you accelerate. This is because the tires are no longer stable and facing forward.
You are most often able to determine if you need a new tire alignment because your car will pull or drift to one side. In severe cases, you may be fighting the pull of the steering wheel, which can create a dangerous driving situation.
A mechanic can quickly assess whether your tires are out of alignment and offer a quick service to put everything in order. This can reduce the road noise and provide a more comfortable, safer commute while protecting the lifespan of your tires.
When Complex Repairs May Be Needed
Wheel alignments, tire rotations, and wheel bearing replacements are all easy, affordable fixes for a vehicle humming at high speeds. However, sometimes it is not the tires or the wheels and is a more complex issue. If your car is inspected and these parts aren’t the issue, your mechanic may discuss other repairs to stop the humming noise.
Differential or Drivetrain Replacements: The bearings, rings, pinions, and axles may start to wear with vehicle age. Sometimes some lubrication can fix the problem, but replacements may be needed to stop the issue from getting worse. If the humming sound increases with higher RPMs vs speed, this is a common sign you’re dealing with something other than the tires.
Wind Noise from Body Damage: You may notice a humming noise at high speed because of the wind sneaking through parts of the car it shouldn’t. This may be a whistling from damaged plastic panels or even damaged weatherproofing around the windows and doors. You can also inspect roof rack bars that may be causing a wind tunnel.
Brake Repairs: A stuck brake caliper can cause a lot of unusual noises, including humming at high speeds. As part of the wheel and tire inspection, your mechanic can check your brakes, including the calipers, to ensure everything is working properly. If brake repairs are needed, it’s a quick fix that can improve overall vehicle safety.
Suspension Replacements: If the wheels and tires check out, it may also be the suspension causing a humming noise at high speeds. Normal wear can cause parts to wear down, which can cause noises when metal is rubbing on metal. Normally, this is a persistent sound but can be more noticeable at highway speeds.
When It’s Time to Visit a Mechanic
A car humming at high speeds should not be ignored. Just because your car makes a sound only on the highway doesn’t mean it’s not a risk; in fact, it could be more dangerous if your car breaks at high speeds. The moment you notice something is different, you want to schedule repairs ASAP.
Look for other changes in your car’s performance, including vibrations, steering changes, grinding sounds, or even clunking noises. A quick inspection can determine a lot and help you budget for and plan car repairs before something breaks.
Hoffmaster’s Auto Care in Silver Spring, MD can help. Don’t ignore a car humming at high speeds – call today for an appointment and improve your commute.
Hoffmaster's Auto Care
Our mission at Hoffmaster’s Auto Care is to provide our customers with the highest level of car repair service and expertise, delivered with honesty, integrity, and a commitment to excellence. Hoffmaster’s Auto Care in Silver Spring, MD has been in business for more than 40 years. All our technicians are ASE certified. You can rely on our experience and knowledge for high-quality auto repair and maintenance services.
