Car Stereo Produce High-Pitched Sound When Using Bluetooth?

When you use Bluetooth to connect your phone to your car stereo, sometimes you’ll hear a high-pitched sound.

This is caused by the way the two devices communicate with each other.

car making noise when using bluetooth

In most cases, there’s nothing wrong and the sound will stop once the connection is established.

However, if the sound continues even after the connection is made, there may be a problem either with your stereo or your phone.

Let’s understand and solve the issue-

Why Does it Happen?

The high-pitched sound is caused by electromagnetic interference.

When your phone and car stereo are trying to establish a Bluetooth connection, they emit electromagnetic waves.

These waves can interfere with each other, causing a high-pitched sound.

This is perfectly normal and there’s nothing to worry about.

However, if the sound doesn’t go away after a few seconds, there may be an issue with your devices.

Hearing the High-pitched Noise Only When Using Handsfree Function

If you experience the noise only when you are using the handsfree function, then it must be the two microphones taking your voice and messing them up.

If both microphones get your sound and provide feedback at the same time, the sound will echo. Will discuss the solution for this in the next section.

How to Solve It?

If you’re experiencing this problem, the first thing you should do is restart your phone and car stereo.

This will often solve the issue.

If that doesn’t work, try connecting your phone to another Bluetooth device.

If the sound is still there, the problem is most likely with your phone. It may have some app that’s interfering with the stereo system. Try to find out any app you have installed recently before the problem started. Try removing that app and test if the problem persists or not.

If that doesn’t work, you may need to factory reset your phone. Make sure to back up your data before doing this.

If the problem is with your car stereo, you can try to update its firmware. Most times, a simple restart or firmware upgrade is what you need to solve this kind of issue.

Solving Echo Issue When Using Handsfree Mode

The echo issue can be solved by tweaking the sound settings.

First check if there is any way in your stereo system to turn off one of the microphones, either the stereo or the external one.

If that’s not possible, try lowering the speaker volume to see if the echo goes away.

If the problem still persists, you may need to adjust the Mic gain in your system.

Sometimes, none of these works. In such cases, you should find and install an app to disable your phone’s microphone temporarily.

The Other Way to Solve It

If you’re still having trouble, there’s another way to solve it.

You can use an Aux cable to connect your phone to the car stereo. This will completely eliminate the Bluetooth connection and any electromagnetic interference.

An aux cord is a much simpler way to connect your phone to the car stereo and doesn’t require any special setup.

It’s also a good idea to have an aux cord with you in case you run into this problem again.


If your car stereo is producing a high-pitched sound when using Bluetooth, don’t worry. It’s most likely due to electromagnetic interference and will go away on its own.

However, if the sound doesn’t go away, there may be an issue with your devices. You can try restarting your phone and car stereo or updating the firmware of your car stereo.

If that doesn’t work, you can use an aux cord to connect your phone to the car stereo.

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