How do I fix my USB ports in my car?

Having functional USB ports in your car has become an essential part of the modern driving experience. USB ports allow you to safely charge and connect your smartphone and other devices while on the go. However, like any technology, USB ports in cars can sometimes stop working properly. Troubleshooting and fixing non-functional USB ports is usually straightforward with some basic tips and tricks. Here is a comprehensive guide on how to get your car’s USB ports working again.

Check if the USB port has power

The first thing you should do when troubleshooting your car’s USB ports is to check if the ports are getting power. Take a typical smartphone charging USB cable and plug it into the questionable USB port. If your smartphone begins charging, then you know power is flowing to the port and the issue likely lies elsewhere. However, if your phone does not begin charging, there is likely an issue with the power supply to that USB port.

Start by checking the car’s fuse box, usually located under the dashboard or in the engine bay. Refer to your owner’s manual to identify the fuse(s) that supply power to your USB ports. Pull out each related fuse and examine it for any breaks or damage. If you find a blown fuse, replace it with a new fuse of the same amperage rating. Once replaced, test the USB port again to see if power has been restored.

If the fuses are all intact, there may be an issue with the wiring leading to the USB port. Inspect the wiring harness connected to the USB ports for any loose, damaged, or disconnected wires. If you are comfortable working with automotive electrical systems, you can test the wiring for voltage drops to isolate the exact location of the wiring fault.

Check for debris and damage

Another common reason USB ports stop functioning in cars is debris, dirt, and damage. Open the USB ports and inspect for any accumulated dust, dirt or foreign objects that may be obstructing the port. Carefully clean out the ports using compressed air. Be very careful not to bend or damage the delicate pins inside the USB ports while cleaning.

Check the ports for any physical damage like bent/broken pins, cracked plastic housing, or detached USB connectors. If there is damage present, the entire USB port assembly may need replacement. Consult your owner’s manual for the correct replacement part number and purchase from an automotive parts store or dealer.

Replacement of built-in USB ports can be challenging without automotive electrical experience. Consider taking your car to professional mechanic for USB port replacement if you are not comfortable performing the work yourself.

Update USB drivers and firmware

Like most computing devices, USB ports in cars rely on software drivers and firmware to function. Outdated drivers or firmware bugs can sometimes cause USB ports to malfunction. If your car’s USB ports have stopped working seemingly out of the blue, a software issue could be the culprit.

Check with your vehicle manufacturer to see if there is an updated USB driver available. Many automakers issue periodic software updates that you can download and install yourself through the infotainment system. This will ensure your car is running the newest version of the USB drivers. Follow your manufacturer’s instructions to complete the process.

In some cases, the car dealer may need to perform the software update using specialized diagnostic tools. Schedule an appointment with the service department to have them update your car’s software as a troubleshooting step.

Updating software is typically the easiest and most affordable repair option. Only pursue additional troubleshooting steps like fuse, wiring, and hardware replacements if the software update does not resolve your malfunctioning USB ports.

Test with a different cable and device

Before assuming the problem lies within the USB ports themselves, try testing them with different cables and devices. Use a cable and device that you know works properly in other USB ports. This helps isolate whether the issue is with the original cable/device combination or the car’s USB ports.

For example, swap your short smartphone charging cable for a longer USB syncing cable. Connect it to a basic USB flash drive instead of your smartphone. If the ports charge the flash drive successfully, then you know the issue was with the original cable and smartphone, not the car’s USB system.

Testing cables and devices is quick and easy to perform. It can save you time, money, and effort compared to jumping right into electrical and hardware repairs on your car’s USB ports. Always use a process of elimination approach when troubleshooting electronics issues.

Reset your car’s infotainment system

Today’s connected cars rely heavily on their infotainment systems to control and manage many vehicle features, including USB ports. Like any gadget running complex software, the infotainment system can sometimes get stuck, freeze up, or need a reboot. Before digging into the wiring or hardware, try resetting your car’s infotainment system.

Check your owner’s manual for the proper reset procedure for your car’s specific infotainment system brand and model. In general, the steps involve:

  1. Turning the car completely off and removing the key from the ignition.
  2. Waiting 5-10 minutes for systems to fully power down.
  3. Restarting the car and infotainment system.

This forces all systems to reboot and clears any software glitches that could be causing issues. Try testing the USB ports again after the infotainment reset to see if operation has been restored.

Contact vehicle manufacturer support

If you have tried all other basic troubleshooting steps like testing fuses, wires, and software, it may be time to bring in expert help. Most automakers have dedicated technical support lines and personnel to help diagnose issues like malfunctioning USB ports.

Gather all relevant information like make/model/year of your car, which USB ports are affected, and steps you have already tried. Then contact your automaker’s support line and explain the situation.

Manufacturers have access to advanced diagnostic capabilities and engineering resources that can pinpoint elusive electrical gremlins. They can also provide direct assistance with downloading software updates and submitting warranty claims if needed.

Technical support can save you from needing complex electrical diagnostics or part replacements. Use all available self-help resources first before taking your car to the dealer or mechanic.

Inspect charging system voltage

While issues with USB ports themselves are most common, in some cases the problem can be caused by low system voltage from the charging system. If the alternator and battery are not properly maintaining between 13-14 volts, USB power can be affected.

Use a multimeter to test voltage directly at the battery posts and alternator charging wire. If voltage is low, inspect the belt condition, alternator wiring, and battery terminals. Recharge or replace components as needed to restore proper charging system voltage.

This is an advanced troubleshooting step best performed by knowledgeable mechanics. However, it can identify root causes like worn charging components that could continue causing USB and other electrical issues.

Replace USB port assembly

If you have exhausted all other troubleshooting options, replacement of the USB port assembly itself may be required. Assemblies can fail due to everyday wear and tear over time. Internal component failures can prevent proper functioning.

Purchase an OEM USB port assembly from the dealer parts department or online retailers. Carefully remove the trim panel surrounding the USB port and disconnect the wiring harness. Transfer any working components like the connector or circuit board to the new housing if possible. Install the fresh USB port assembly and test operation.

Replacing USB ports requires expertise to properly remove panels and disconnect wiring. Consider having a professional mechanic complete the work if you lack experience. Always consult repair manuals.


Troubleshooting car USB ports starts with simple solutions like checking fuses, wires, and software. Try different cables and devices to isolate the issue. If basic steps don’t restore functionality, manufacturer support and electrical testing may be required. While replacing USB hardware is an option, only do so after systematic troubleshooting. With patience and diligence, you can get your car’s USB ports working again.

Troubleshooting Step Details
Check for power Inspect fuses, wiring condition, and voltage
Check for debris and damage Clean ports, replace damaged parts
Update USB drivers and firmware Get latest software from manufacturer
Test with different cables and devices Isolate issue to cable/device or car USB system
Reset infotainment system Reboot central computer controlling USB ports
Contact manufacturer support Access diagnostics and direct technical help
Inspect charging system voltage Alternator and battery must supply 13-14 volts
Replace USB port assembly Install new USB hardware if needed

Additional USB Port Troubleshooting Tips

Here are some additional helpful tips for diagnosing and fixing USB issues in cars:

  • Check if USB ports work properly in safe/accessory mode – Points to ignition/battery power issues if they do.
  • Inspect USB ports for bending/damage from inserting devices at an angle
  • Test voltage drop along USB wires back to source pinpoint connectivity faults
  • Update computer operating system/firmware as older versions can cause USB glitches
  • Try a USB-C to USB-A adapter to test if USB-C port itself has failed
  • Replace loose, corroded or damaged USB wiring harness connectors
  • Check ground wires and connections from USB ports back to vehicle chassis

Following a logical diagnostics process and leveraging all available resources will help get your car’s USB ports functioning again. Be methodical and patient, and you can resolve most USB issues with basic troubleshooting.