"Accidental trackpad input" on a MacBook 2015 12 while typing

Hello there, malibongwe.

It sounds like you're having troubles with unexpected behavior from the trackpad on your MacBook. The following Knowledge Base article provides some great and thorough steps to try for troubleshooting:

If your pointer is jumpy when you use a trackpad, Magic Trackpad, or Magic Mouse

Check your device's power

Make sure your device's batteries aren't low. If you're using Magic Trackpad 2 or Magic Mouse 2, make sure its rechargeable battery is fully charged.

Avoid accidental multiple touches on the surface

Be sure only one part of your finger is touching the touch surface and that you're not resting your wrist on or very close to the surface. The touch surface might interpret this as your finger touching it and move the pointer in that direction

Keep touch surface dry and clean

Moisture collecting on the touch surface can also cause this issue. Wiping off the surface of the trackpad or mouse with a cloth or tissue usually fixes this.

If the issue goes away when you put a piece of paper between your finger and the touch surface, consider purchasing a Teflon applique to fit over the surface to prevent moisture from having direct contact with the touch surface. Before you install the Teflon applique, make sure the touch surface is clean and dry.

Note that oil or lotion can also cause the same issue. You can clean your device's touch surface with a lint-free cloth lightly moistened with water.

Remove jewelry

Jewelry might also cause interference when you use a device with a touch surface. Try removing rings or bracelets and see whether the jumpy or erratic behavior disappears.

Check the power adapter you're using with your Mac

This behavior might happen if you use a power adapter made by a third-party company.

If you're using one of these power adapters, unplug it and try running your Mac from battery power to see whether the pointer behaves correctly. If the device behaves normally while running from the battery, there might be an issue with your power adapter.

Avoid wireless interference

Bluetooth devices can act erratically when there's wireless interference. See Wi-Fi and Bluetooth: Potential sources of wireless interference for more information.

Start your Mac in Safe Mode

If none of the above resolves the issue, you can start in Safe Mode to rule out third-party software as a cause.

Thanks for reaching out to Apple Support Communities.

Kind Regards.

Make sure Tap-to-Click is disabled in Trackpad system preference.

Hello again, malibongwe.

Thanks for the follow-up on your issue and the further information in regard to what steps you have already taken. Some further information is provided in this article has some next steps:

How to test an issue in another user account on your Mac

If an issue happens in only one user account

If performing the same steps in a test user account doesn't result in the same unexpected behavior, you most likely don't need to reinstall any apps or OS X.

• If an issue only happens in one app, check the app's documentation or support website for instructions on troubleshooting specific preference or setting files.
• If you need help with a specific alert message or issue, search the Apple Support website for the text of the alert message you're seeing.

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After you're done

After you've finished testing, log out of the test account by choosing Log Out from the Apple menu. Then log in to your original user account.

You can remove the test user account you created when you're done. Make sure you're completely finished testing, and that you don't need any of the files or settings you created or copied there before you remove it.

Get help

If you need more help with a software or hardware issue, contact Apple Support. If you work with an Advisor, Genius, or service provider to resolve an issue, be sure to mention any steps you've already tried and the results. Also mention any alert messages you've seen as part of the issue. You can take a screenshot of any messages that appear so you can refer to them later.

Kind Regards.

Go to Systems preferences > Accessibility > Click on interacting ... and check the 'ignore built in trackpad' box. That will kill the trackpad and enable you to freely type.