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Has anyone had the experience of one of the Thunderbolt/USB ports ceasing to function with no apparent cause?

Has anyone had the experience of one of the Thunderbolt/USB ports ceasing to function with no apparent cause? Using Big Sur 11.6, my MacBook Pro (13-inch, 2016, Four Thunderbolt 3 Ports) has one port that no longer functions. Have you found a solution to correct this beyond having to take it the the Genius Bar for service?

MacBook Pro 13″, macOS 11.5

Posted on Oct 1, 2021 9:21 AM

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Question marked as Top-ranking reply

Posted on Oct 1, 2021 10:12 AM

jackwent wrote:

Has anyone had the experience of one of the Thunderbolt/USB ports ceasing to function with no apparent cause? Using Big Sur 11.6, my MacBook Pro (13-inch, 2016, Four Thunderbolt 3 Ports) has one port that no longer functions. Have you found a solution to correct this beyond having to take it the the Genius Bar for service?



Reboot typically redefines port definition...


However you can try Try resetting NVRAM/PRAM http://support.apple.com/kb/ht1379

(get at least two-three rounds of the chimes when holding the NRAM Reset)


if no resolve—

resetting the SMC https://support.apple.com/en-us/HT201295

Try a SafeBoot https://support.apple.com/en-us/HT201262



You can try running the user Diagnostic...not as definitive as Apple's own AST2 (Apple Service Toolkit) back bench diagnostic, but may kick out an error code.


Use Apple Diagnostics to test your Mac

https://support.apple.com/en-us/HT202731




Learn how to get your Mac fixed and how much it will cost. https://support.apple.com/mac/repair/service

Get your Mac ready for service - Apple Support https://support.apple.com/en-us/HT209095



1 reply
Question marked as Top-ranking reply

Oct 1, 2021 10:12 AM in response to jackwent

jackwent wrote:

Has anyone had the experience of one of the Thunderbolt/USB ports ceasing to function with no apparent cause? Using Big Sur 11.6, my MacBook Pro (13-inch, 2016, Four Thunderbolt 3 Ports) has one port that no longer functions. Have you found a solution to correct this beyond having to take it the the Genius Bar for service?



Reboot typically redefines port definition...


However you can try Try resetting NVRAM/PRAM http://support.apple.com/kb/ht1379

(get at least two-three rounds of the chimes when holding the NRAM Reset)


if no resolve—

resetting the SMC https://support.apple.com/en-us/HT201295

Try a SafeBoot https://support.apple.com/en-us/HT201262



You can try running the user Diagnostic...not as definitive as Apple's own AST2 (Apple Service Toolkit) back bench diagnostic, but may kick out an error code.


Use Apple Diagnostics to test your Mac

https://support.apple.com/en-us/HT202731




Learn how to get your Mac fixed and how much it will cost. https://support.apple.com/mac/repair/service

Get your Mac ready for service - Apple Support https://support.apple.com/en-us/HT209095



Has anyone had the experience of one of the Thunderbolt/USB ports ceasing to function with no apparent cause?

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