MacBook Pro 2019 16” USB 3.1 not enabling on macOS 26 Tahoe

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Level 1

32 points

MacBook Pro 2019 16” USB 3.1 not enabling on macOS 26 Tahoe

My MacBook Pro 2019 16” is not enabling USB 3.1 on macOS 26 Tahoe, however after doing a clean install to the original macOS version (Catalina) System Report show the USB ports as it should, I try other versions up until Ventura and still OK, but after making again a clean install of Tahoe most of my USB devices go to the USB 2.0 or USB 3.0 bus, also on the T2 bus the Composite Device is display as Unnamed device only on Tahoe, up until Ventura still display it as Composite Device. I haven’t try to install Sequoia or Sonoma but before I do anything else I will like to try here to see if anyone has information about this problem or if it’s a failure on my logic board because this MacBook Pro the last year suffer from a black screen for several weeks but one day it revive on it self.

I’m uploading the screen shots from system report one from Monterey and other from Tahoe.

Any help someone?

Thanks in advance.

Posted on May 10, 2026 9:06 PM

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Answer 1

May 12, 2026 7:15 AM in response to VmBeltran

In every screenshot you posted, only the Top-level details, which generally show only the T2 Bus, are shown in detail. The T2 bus has NO external connectors -- everything on it is strictly internal.

MUCH more information is available if you would select the USB Bus you wanted to examine in more detail, OR scroll the list downward to the detailed information for that specific Bus.

Your Mac DOES show that one device, a 'Data Traveler ...' device, is on a USB-3 Bus

But another device shows as on a USB-2 HUB, and then a different USB storage device.

That looks like you plugged in a device with a Built-in Hub, and are using an actual Hub whose speed is limited to USB-2.

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Answer 2

leroydouglas

Level 10

206,288 points

May 10, 2026 9:59 PM in response to VmBeltran

VmBeltran wrote:

My MacBook Pro 2019 16” is not enabling USB 3.1 on macOS 26 Tahoe...

or if it’s a failure on my logic board because this MacBook Pro the last year suffer from a black screen for several weeks but one day it revive on it self.

Try the User Diagnostics to test your Mac for hardware issues

Use Apple Diagnostics to test your Mac - Apple Support

Run the test while plugged into power.

unplug all non-essential peripherals when testing

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Answer 3

May 12, 2026 6:49 PM in response to VmBeltran

<< But what is responsible to tell the real speed of each USB that’s plugged? >>

Your mac's Thunderbolt ports are available for a multitude of purposes. They remain that way until you plug in the first device. ThunderBolt and USB devices are self-identifying -- they report what kind of device they are, and what speeds they support. Even many cables are self-identifying.

So when you plug a USB-2 Hub into a Thunderbolt port, that port is customized for USB-2 speed transfers using USB-2 protocols, and becomes, for all practical purposes, a USB-2 Bus. Even though a moment ago, it was a fully-capable ThunderBolt Bus.

There is NO mechanism for specifying faster speeds, except plugging in faster devices. And if you did specify faster speeds, data transfers would be garbled and useless.

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Answer 4

May 11, 2026 7:46 AM in response to VmBeltran

All the USB ports on your Mac are capable of high speeds, possibly even Thunderbolt speeds, which are at least twice as fast as USB-3. .

When devices are plugged in, your Mac reports the actual speed in use. For example, If I plug in a keyboard directly, the Bus it is on will typically report as a USB-2 Bus, unless a faster hub is used.

If your cables are too long or not high enough spec to support higher speeds, or the slowest specific device(s) you connect are only capable of USB-2 speeds, the Bus will report as a USB-2 Bus. This is NOT a defect.

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Answer 5

VmBeltran Author

Level 1

32 points

May 12, 2026 2:54 AM in response to Grant Bennet-Alder

Yes, I know basically how it works, I know that there has to be a controller that send the USB to the most compatible bus, I think there is the problem, I can’t assure that of course but because assuming the hardware is fine and my cables and usb sticks supports USB 3.1 or USB 3.0 and on macOS Tahoe they show up on the USB 2.0 wile on Ventura shown on the USB 3.1 then my logical assumption is that the controller on macOS Tahoe is faulty. Maybe and this is just a the theory, because Apple is taking out support for Intel Macs, Tahoe had some issues with the firmware possible a lack of deeper review due to the hardware obsolescence. Well I think I’ll had to go to a Genius Bar to get more details. But thanks for taking the time to help me. I appreciate it! Good day.

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Answer 6

VmBeltran Author

Level 1

32 points

May 12, 2026 2:53 AM in response to leroydouglas

Thanks for the help. Sorry it took so long for answer but I just had the chance to run the diagnostics.

it report everything is ok with my Mac, then it restarted on recovery, but after selecting my country the browser stays on a blank page and do nothing until I exit and reboot. This is the screen shot from the diagnostic screen.

any other thoughts? 🥺

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Answer 7

VmBeltran Author

Level 1

32 points

May 12, 2026 2:59 AM in response to Grant Bennet-Alder

Oh and yes! This MacBook Pro has thunderbolt 3 through the 4 USB-C connectors it has. (Only 4 USB-C connectors).

But at the time, I don’t had any thunderbolt device so I haven’t use it, actually never used on this Mac. I used the FireWire 800 on 2 old Mac, a Mac mini and a MacBook Pro 2011 to connect them for service and even the discontinued FireWire is faster that USB 2.0.

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Answer 8

VmBeltran Author

Level 1

32 points

May 12, 2026 10:30 AM in response to Grant Bennet-Alder

🙈 sorry! Well I think I did that on purpose, I wanted to put in perspective with a few USB devices plug in with different speed each device, yes there is an actual usb 2.0 bus that is actually an external optical drive with some extra USB on the rear, but the data travelers are usb 3.0 and the data traveler 70 is USB 3.1 directly plug in the USB-C port. How can I print a better diagnostic to post here? I don’t know 🤷‍♂️ I don’t what to post any serial number or private info, I think there’s an app used for some here in this forums but I don’t remember the name. It prints information on the system on a secure way, but let me tell you that on the screenshots I posted, you can see that there is a “composite device” that in the other just said: “unnamed device” that’s something inside the T2 Bus right? But what is responsible to tell the real speed of each USB that’s plugged?

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