Car Subwoofer Not Working [Causes & Fixes]

A properly functioning subwoofer can make all the difference, whether you’re blasting your favorite tunes on a road trip or enjoying your daily commute.

Unfortunately, subwoofers are not immune to issues, and it’s not uncommon to encounter problems with them. If you’re facing the issue of a car subwoofer not working, this guide is here to help you diagnose the issue and get your subwoofer up and running in no time.

In this guide, we’ll go over the possible causes of your subwoofer not working and provide a step-by-step troubleshooting guide to help you identify and solve the problem.

Car Subwoofer

Possible Causes of Car Subwoofer Not Working

There are several possible causes for a car subwoofer not working, and it can be frustrating when you’re not sure what’s causing the problem. Here are some of the most common reasons why your subwoofer might not be working:

1. Loose Connections or Faulty Wiring

If the wiring between the subwoofer and the amplifier is loose or damaged, the subwoofer won’t receive any signal from the amplifier, which can result in no sound output. Make sure to check all the connections and wiring to ensure they’re secure and undamaged.

2. Blown Fuses

Fuses protect the subwoofer and amplifier from electrical damage, but if they blow, the subwoofer won’t receive any power, and no sound will be produced. Check the fuses on both the subwoofer and amplifier to make sure they’re not blown.

3. Amplifier Failure

The amplifier provides power to the subwoofer, and if it’s not working correctly, the subwoofer won’t work either. A blown fuse, faulty wiring, or an internal problem with the amplifier can cause this.

4. Subwoofer Damage

Physical damage to the subwoofer, such as a tear in the cone or a damaged voice coil, can cause it to stop working. This can happen if the subwoofer is exposed to moisture or if it’s overloaded with too much power.

5. Settings or Audio Source Issues

It’s possible that the subwoofer is working fine, but the settings or audio source are not configured correctly. Check the settings on your audio system to ensure the subwoofer is enabled, and check the audio source to make sure it’s working correctly.

How to Troubleshoot Car Subwoofer Not Working

Now that we’ve identified the possible causes of a car subwoofer not working, let’s go over some step-by-step troubleshooting tips to help you identify and fix the problem.

1. Check the Connections

The first step is to check all the connections between the subwoofer and the amplifier. Make sure the wiring is secure and undamaged. If there are any loose connections or damaged wires, fix them and try again.

2. Test the Fuses

If the connections are fine, the next step is to test the fuses. Check the fuses on both the subwoofer and amplifier to see if any of them are blown. Check the fuses on both the subwoofer and amplifier and if you find a blown fuse, replace it with a new one of the same rating and test the subwoofer again.

3. Inspect the Amplifier

 If the fuses are fine, the next step is to inspect the amplifier. Check the amplifier for any visible signs of damage, such as burned components or blown capacitors. If everything looks fine, test the amplifier with a different subwoofer or speaker to make sure it’s working correctly.

4. Test the Subwoofer

If the amplifier is fine, the next step is to test the subwoofer itself. Disconnect the subwoofer from the amplifier and test it with a different audio source or amplifier. If the subwoofer still doesn’t work, it’s likely that it’s damaged and needs to be replaced.

5. Check the Settings and Audio Source

If everything else checks out, the last step is to check the settings on your audio system and the audio source. Make sure the subwoofer is enabled in the settings and check the audio source to ensure it’s working correctly.

Tips for Preventing Car Subwoofer Not Working Issues

Preventing issues with your car subwoofer is always better than having to troubleshoot and fix them. Here are some tips to help prevent problems with your car subwoofer:

1. Proper Installation

Make sure you install your subwoofer and amplifier correctly. Make sure all the wiring is done correctly and that the subwoofer and amplifier are compatible. It’s also a good idea to use high-quality wiring and connectors to ensure a solid and secure connection.

2. Keep It Dry

Subwoofers are sensitive to moisture, and exposure to water can damage them. Avoid installing subwoofers in areas of the car where they can get wet or damp, such as the trunk or floor.

3. Use Proper Power

Make sure your subwoofer is receiving the correct amount of power from the amplifier. Using too much power can damage the subwoofer, while not enough power can result in poor sound quality or no sound output.

4. Avoid Overloading

Overloading your subwoofer with too much power can cause it to stop working. Always check the specifications of your subwoofer and amplifier to ensure they’re compatible and not overloading the subwoofer.

5. Regular Maintenance

Regularly check your subwoofer and amplifier for any signs of damage or wear and tear. Also, keep them clean and free of dust and debris.

6. Avoid Overheating

Subwoofers can overheat, especially when played at high volumes for extended periods. Ensure that you keep your subwoofer properly ventilated and not blocked by any other objects or materials.

7. Keep the Car Battery Charged

A weak or dead car battery can cause issues with the subwoofer and amplifier. Make sure to keep your car battery charged, and replace it when necessary.

8. Use Quality Audio Sources

Low-quality audio sources can cause damage to your subwoofer and amplifier, as well as reduce the sound quality. Use high-quality audio sources, such as lossless audio files or CDs, to ensure the best sound quality.

9. Use a Power Surge Protector

A power surge can damage your subwoofer and amplifier. To prevent this, use a power surge protector that can protect your audio system from power surges and spikes.

10. Check Your System Regularly

Regularly check your subwoofer and amplifier for any signs of issues or damage, such as distorted sound, no sound output, or strange noises. Catching problems early can help prevent them from getting worse and causing more significant issues later on.

How Do I Know if My Subwoofer Fuse Is Blown?

To know if your subwoofer fuse is blown, turn off and unplug the subwoofer from the power outlet. Locate the fuse, which is usually near the power cord input or amplifier section of the subwoofer, and visually inspect it. Check if the metal filament inside the fuse is broken to determine if it is blown. 

Is There a Fuse in a Subwoofer?

Some subwoofers may have a fuse built-in as a safety feature to protect against electrical issues or power surges. However, not all subwoofers have fuses, and it depends on the specific model and manufacturer.

Read: Kenwood Car Stereo Troubleshooting


A car subwoofer not working can be frustrating, but it’s not an uncommon issue. Understanding the possible causes of the problem and how to troubleshoot it can help you fix it quickly and get back to enjoying your favorite music on the road.

Taking preventative measures, such as proper installation, avoiding overloading, keeping it dry, and regular maintenance, can help you avoid subwoofer not working issues altogether.