USB C Post not working after Catalina 10.15.4 update.

Hi Anurag,

Yes those instructions will work on low battery state as long as the MacBook has enough power to boot up.

Can you follow the instructions in this article by Apple, Step by Step ➔ If your Mac does not turn on - Apple Support and see if that helps.

Axel F.

Hi Anurag,

Your MacBook Air 2019 comes with two USB-C ports as you know. Are both ports not operational? I am assuming that they are not. Is the battery dead or your MacBook Air just not turning ON?

Try and follow the instructions in this article by Apple ➔How to Reset the SMC on your MacBook. See if that helps if you are able to perform the task. If the procedure works then also ➔ Reset the NVRAM on your MacBook. Good Luck.

Axel F.

If you can turn your MacBook Air then at that time Reset the SMC as shown in my previous post. Just note that you have a MacBook Air 2019 using a T2 Chip so follow the instructions for that model.

If you feel that nothing works then take your MacBook Air back to an Apple Store or an authorized repair center while it is still covered under Apple's 1YR limited warranty. I know Apple stores are closed these days and therefore you may contact Apple Support from the link at the top right of this screen and ask what can be done.

Axel F.

I may be having a similar issue with my <2 weeks old Macbook Air (Retina, 13-inch, 2020) running Catalina 10.15.4.

When I unplug cables from the USB-C ports then plug them back in, the port toward the back stops working. The power cable will not power the battery even when directly connected, nor will any other USB-C device work through that port. I can reset the SMC to restore functionality. Sometimes it takes a couple of resets to make it work again.

The problem recurs every time I unplug the USB-C cables from the laptop.

That back port is usually occupied by a hub that has Cat-5 (ethernet), HDMI, and power. The front port has an HDMI to USB-C cable. The same problem occurs if the two are switched, and as stated before the port doesn't work even if I bypass the hub and plug in the cables directly to USB-C.

The port closer to the front of the laptop seems to work reliably.

Two of my USB C ports on my 2016 MacBook pro are out, as is the camera since installing Catalina. Yet if you call Apple support, they don't mention this as an issue. Additionally those two ports burned up (literally) 2 web cams and a headset before they went dead. They sent me to a repair store who wanted 900 for a camera replacement as its imbedded in the screen. Something is up with the customer service, and testing/QA.

Unfortunately, no. It gets worse. For the last two weeks, SMC resets don't restore functionality. One of the USB-C ports on my brand new Macbook is now totally unresponsive. Hoping you have better luck, sfmixer!

Adding to this: Mobile kangaroo, apple's support partner, offers to downgrade to high sierra for $149 which they say fixes these issues.

I am in the same scenario as Apicurious with a new 2020 Macbook. SMC reset only fixes temporarily. Did you ever find a permanent solution?