How To Fix MacBook Pro USB-C Port Not Working

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Productivity often comes to a screeching halt when the USB-C Ports on your MacBook Air or pro stop working. In this article, I’ll help solve your USB-C port issue by explaining why they stop working.

First Things First

Before you read about the four reasons for your MacBook Pro USB-C port not working, you should go through this list of quick solutions first:

1. Make sure you’ve installed the latest version of macOS
2. Reboot your MacBook Pro
3. Run Apple Diagnostics test

The first two steps are straightforward and could reactivate the USB-C port. Running an Apple Diagnostics test will make it easier to identify if the error is software- or hardware-based, simplifying the troubleshooting process.

Now, let’s discover why your Mac’s USB port are acting out.

Possible Reason #1: SMC Needs A Reset

If rebooting your MacBook Pro doesn’t reactivate your USB port, resetting the SMC may do the trick. The SMC manages power-related functions such as thermal management, battery charging, and USB-C port functionality. If your MacBook Pro experiences issues with the USB-C ports, try resetting the SMC as a troubleshooting step.

Resetting the SMC is almost like a finger gymnastics exercise, but it usually reactivates your MacBook’s USB-C port. So, it’s worth giving it a try. Here’s how to reset the SMC on your MacBook Pro:

On Intel-based Macs

For Intel-based MacBook Pros, follow these steps:

1. Press and hold the Control, Option, and Shift buttons simultaneously.
2. After seven seconds, press and hold the power button too.
3. Your MacBook Pro will turn off at this point, but keep holding the keys for another seven seconds.
4. After that, wait ten seconds and press the power button again to switch on your MacBook Pro.

On Apple Silicon Macs

Resetting the SMC on Apple Silicon Macs is simpler than resetting the SMC on Intel-based Macs. Here are the steps to reset the SMC on Apple Silicon Macs:

1. Shut down your Mac.
2. Hold the power button for at least 10 seconds, then release it.
3. Wait a few seconds and press the power button again to turn on your Mac.

That’s it! After resetting the SMC, you can test the USB ports to see if they work properly.

These steps apply to MacBooks, including the Apple T2 security chip introduced in late 2017. If you have an older MacBook, read the instructions here.

Possible Reason #2: Dead External Drive

Sometimes, the drive you’re trying to connect to your Mac’s USB-C port is faulty. In that case, there’s no issue with your Mac’s USB-C port.

Plug a different device into the USB-C port to check if you have a dead drive. If it connects, the issue is with your external hard drive, not your MacBook Pro’s USB-C port. You can also try connecting the possibly faulty external drive to another computer. It is damaged if it doesn’t connect to that computer either. 

Alternatively, you can diagnose a dead external drive by following these steps:

1. Click the Apple menu in the Menu bar.

2. Holding the Option key click System Information.
3. In the left sidebar, under Hardware, open the USB section.

4. If you can see your external drive here, but it doesn’t work on your Mac, it means the drive is faulty instead of the USB ports.

5. Be sure to review the drive’s documentation for troubleshooting tips.

You can click the device for more information, like data speed, manufacturer, and current requirements. It’s also possible that the Finder preferences have been set up to hide the device you’re trying to connect to. For more info on that, read this article.

Possible Reason #3: Faulty USB Device

It’s possible that the issue isn’t with your USB-C port but the external devices or peripheral you’ve connected to. Maybe its USB C cable is worn out, overheated, or just hogging too much power. Here are a few steps you can follow to troubleshoot this issue:

1. First, disconnect all non-essential USB devices except the one you’re testing.
2. Establish a direct connection with the MacBook, excluding hubs or extension USB C cables.
3. If the device works fine, one of your other external devices is causing the problem.
4. Do it with all your USB devices to identify the faulty one.

Besides this, you can also check for a few other things, like the following:

1. If the device’s USB C cable is worn out, try a different one.
2. If you’re using a USB C hub, the data speed of both the device and the USB C hub must be aligned, like a USB 3.0 Hi-Speed device properly connected to a USB 3.0 Hi-Speed hub.
3. Install the latest software available for the device directly from the developer.

If you want more advice like this, read this article by Apple.

Possible Reason #4: Dust Buildup

If you use your MacBook Pro in a dusty space, its USB-C ports may become clogged with dirt and debris, resulting in frequent connection drops. Doing a quick cleanup can help reactivate them.

For this process, you need a wooden toothpick or a disposable floss pick (avoid using a metal needle), a can of compressed air, and a soft, dry brush or cloth. Now, follow these steps to clean your MacBook’s USB ports:

Before you clean the USB ports, shut down your MacBook Pro.

1. Place the thin nozzle of the compressed air can over one USB-C port and spray it a few times.
2. Take your toothpick or floss pick, slide it down into the USB ports, move it around the edge, and bring it back up to flick any dirt or debris. Be careful and gentle.
3. Hold your MacBook Pro with the USB ports facing the floor and blow compressed air in it again.
4. Use a dry brush or cloth to clean around the edges.
5. Repeat this process for each USB port on your MacBook Pro.

You can purchase anti-dust plugs if you don’t want to worry about dust buildup again. This one from PortPlugs comes with ten USB-C plugs, five headphone jack plugs, and a cleaning brush.

What’s Next?

If you’ve tried all the above solutions, but none has reactivated your MacBook Pro’s USB-C ports, there’s likely a more severe issue. It could be water damage, corrosion, or a faulty board. It would be best to get in touch with an Apple repair technician.

Frequently Asked Questions

Now that you know how to reactivate USB-C ports, here are some common questions that might be running around your mind.

Conclusion

The USB-C ports on your MacBook Pro suddenly becoming unresponsive can reduce productivity. 

Fortunately, many solutions get those stubborn Mac’s USB ports back in working order. From resetting SMC (system management controller) to doing a quick cleanup, you’ve got plenty of tricks to try. Hopefully, these solutions get the USB ports up and running again.

Did trying out these solutions reactivate your USB-C ports? Do you have any tips for other users facing the same issue to follow? Feel free to share in the comments!

I'm an Apple fan who's been using an iMac and a MacBook Pro for work-related tasks since 2017. I also own an iPhone 13 and several other small Apple accessories. Although I'm preparing to build my own PC soon, I still spend most of the time on my Mac.