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Released in November 2020, the 13" MacBook Pro features Apple's Arm-based M1 SoC with both an 8-core CPU and 8-core GPU. (Model A2338 / EMC 3578 with two Thunderbolt 3 ports)

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I have an unreliable thunderbolt port, the second one works fine,

What could be the issue? The first one works then stops, then works then stops, I noticed some corrosion on the board while replacing the trackpad, but it's very confusing. None of them seem to even affect the tb3 controller.

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How about posting some pics so we too can see the corrosion Adding images to an existing question

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I wiped away the corrosion and it works fine now, haha! Quite interesting, there was corrosion shorting one of the very small chips on the board, almost looks like a tiny mosfet.

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You may need to replace the MacBook Pro (A1989, A1990, A2141, A2159, A2251, A2289, A2338 Mid 2018-2022) USB-C Board that will require lifting the logic board out to give you access to the screws which hold the port assembly as you can see here

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MacBook Pro (A1989, A1990, A2141, A2159, A2251, A2289, A2338 Mid 2018-2022) USB-C Board Image

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MacBook Pro (A1989, A1990, A2141, A2159, A2251, A2289, A2338 Mid 2018-2022) USB-C Board

$14.99

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Wiped away the corrosion and it works now, but Dan's answer is the one that should work for basically everyone. <3 It seems like my problem was on the main board though, not the USB port board!

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wkw030210 will be eternally grateful.
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