"Liquid in USB-C Port" Error message

Savitri.for.me wrote:

Thank you - I didn't realize that the "Thunderbolt" ports were technically USB-C also.

FYI, "USB-C" is the type of connector. That is all.

For USB-C types of connections, the following are possible:

• USB data transfers
• Thunderbolt data transfers
• Power/Charging Only
• Combination of any or all of the above

Both the cable and the devices connected to those cables will determine which of those four options apply.

Thunderbolt cables are required to be marked. Usually they will have a lightning bolt icon on them, but some of the newer ones may also have other identifiers to specify which Thunderbolt generation of protocols it supports such as 3 or 4, etc.

USB cables should also be marked, but the organization behind the USB standard has made a huge mess of things and it does not help that some manufacturer's don't even bother marking their cables. However, USB data cables should also have some type of USB marking & identification. Keep in mind a Thunderbolt marked USB-C cable also supports USB protocols.

USB-C ports on a device should ideally be clearly marked, but Apple doesn't believe in providing unsightly markings (at least on their laptops these days).

Usually if a USB-C port or cable is not marked with the standard/protocol it supports, then assume the worst and it only supports USB data protocols or perhaps is only a charging cable/port (generally charging ports on devices will show a power symbol of some sort).

Thing is, the MacBook Air [15" 2024] has never been near anything liquid - other than the high humidity we've been having these past two days! Can that do it?

As for the ports - I am a light user, and haven't plugged anything into these ports for days, so no liquid from that potential source either.

Keep in mind that any dirt/dust which builds up between the contacts on the USB-C port itself, or even on the Logic Board connector (and its solder joints) could trigger a condition. Also, whatever method Apple is using to determine a potential electrical short may be too sensitive and could be giving false positives. I'm sure it is tricky striking the right combination to alert the user.

Plus if anything was already on the contacts or internal connectors & circuits, perhaps it wasn't enough to initially cause a problem, but corrosion can build up over time and any dirt can accumulate more dirt & mixed with high humidity could cause an alert.

This new Apple feature can both be a good & bad thing. I can tell you from personal experience supporting my organization's Mac......the USB-C ports seem to attract liquid and it only takes a small drop that my splash into the port to cause a problem. I've encountered so many damaged USB-C ports that I always examine them even when the user is not reporting an issue with the ports.

Unfortunately we have no idea whether your laptop is actually experience a potential electrical short on a USB-C port/circuit, or if it is just a too sensitive Apple configuration for the alert and it is just a false positive. If you continue to receive this alert, then you will need to have Apple or an Apple Authorized Service Provider examine your laptop to see if there is any issue with those ports or their internal connectors & circuits. You should definitely provide them a copy of the Apple article since I'm sure they are not aware of this new change to macOS alerting users to potential liquid damage to the USB-C ports.

You can always provide Apple with product feedback here:

https://www.apple.com/feedback/macos/

If your MacBook Air is of a model and year that can run macOS Tahoe 26, it most certainly does have USB-C ports.

Thunderbolt/USB-C ports in fact.

MacBook Air (15-inch, M2, 2023) - Tech Specs - Apple Support

Savitri.for.me wrote:

I keep getting error message "Liquid has been found in the USB-C Port" on my MacBook Air - which doesn't have a USB-C Port! What's going on?

You have liquid damage. See this article for next steps:

If you see a liquid-detection alert on your MacBook Neo, MacBook Air, or MacBook Pro - Apple Support

HWTech wrote:

Learned something new! I was not aware macOS had added such alerts or could detect possible liquid.

Thanks for the link.

According to Apple, it is relatively recent, since Sequoia, and only for Silicon Macs:

"In macOS Sequoia or later, when you connect a USB-C cable or accessory, your MacBook Neo, MacBook Air with M3, M4, or M5 chip, or MacBook Pro with M3 Pro, M3 Max, M4, M4 Pro, M4 Max, M5, M5 Pro, or M5 Max chip can warn you if there's liquid in the port."

If you move your device from a cool, air-conditioned environment into warm, muggy, humid air …

… condensation WILL form on the device’s parts until they warm up at-least to the air’s dew point temperature.

Depending on the severity, it might indeed be sufficient to trigger a moisture detection alert … or worse, actually damage the hardware.

steve626 wrote:

You have liquid damage. See this article for next steps:

If you see a liquid-detection alert on your MacBook Neo, MacBook Air, or MacBook Pro - Apple Support

Learned something new! I was not aware macOS had added such alerts or could detect possible liquid.

Thanks for the link.

Fortunately, your MBA is likely less susceptible to internal condensation damage that the “air breathing” devices.