Haptic feedback on MacBook Pro stopped working after MacOS 13.4 upgrade

I am having the same issue on 2018 mac book pro after upgrading to sonoma. I cannot boot into safe mode. The "safe mode" login screen appears briefly intermittently, cannot log in.

I managed to enter safe boot also did resetting NVRAM, SMC, etc. The Apple Diagnostic kept telling me there is no issue with hardware. But the haptic is still not working. I solved this issue by replacing the trackpad. Works like charm.

Hello steve_vi,

We would like to see how we can help you with your trackpad. Simply using safe mode may resolve this issue. What we need to do is see if the problem persists during safe mode. Here are the steps we’ll need to take to do so: How to use safe mode on your Mac - Apple Support

"Apple silicon

1. Shut down your Mac.
2. Turn on your Mac and continue to press and hold the power button until you see the startup options window.
3. Select your startup disk, then press and hold the Shift key while clicking “Continue in Safe Mode.”
4. Log in to your Mac. You might be asked to log in again.

Intel processor

1. Turn on or restart your Mac, then immediately press and hold the Shift key as your Mac starts up.
2. Release the key when you see the login window, then log in to your Mac. 
3. You might be asked to log in again. On either the first or second login window, you should see ”Safe Boot” in the upper-right corner of the window."

After the device boots into safe mode, try to reproduce the problem. Knowing whether or not the problem persists in safe mode will provide valuable insight as to how deep the problem may be rooted.

If safe mode does not work, or the restart after a successful boot into safe mode does not work, please contact us back with the results so we can troubleshoot further.

Cheers!

my Haptic feedback Is also not working.

I have tried Safe Boot, restoring factory settings, cleaning and replacing the part. what else can I try?

I rebooted the my device (macbook pro 13 inch 2019 with touchbar) in safe mode and the haptic feedback worked for 5 mins and then stopped working. Now I booted the mac in normal mode and the trackpad haptic feedback still doesnt work. Really appreciate if we can get a quick fix for this since its clearly affecting alot of users.

I am having similar issue on Macbook Air 2020. Suddenly this morning the haptic not working. Tried getting into Safe Mode. At the login page, it shows "Safe Boot". But I cannot login. Evertime enter password, it goes back to the "Safe Boot" login page.

I fixed it!! It required me replacing the ribbon cable.