How do I resolve persistent "Caps Lock" issue on MacBook Pro 16-inch Intel when Keyboard Viewer fails?

1Tower3Kings wrote:

ANY OTHER ADVISE?

Try any kind of wired external keyboard to see if that lets you operate normally or not.

To proceed and a way forward —

You can disable the caps lock altogether

System Settings>Keyboard>Keyboard Shortcuts>Modifier Keys>Caps Lock Key>> Caps Lock

To trouble shoot further you can:

—A SafeBoot Start up your Mac in safe mode - Apple Support will sort many anomalies

Does a quick disk repair before it fully boots up, and certain system caches get cleared and rebuilt, third party system modifications and system accelerations are disabled temporarily.

Login and test. Reboot as normal and test. Caches get rebuilt automatically.

This test will tell you if third party interference; most extensions etc are not loaded in safe boot mode.

—Test issue in another user (or guest user) account Change Users & Groups settings on Mac - Apple Support

This will tell you if it a universal issue or isolated to your user/admin account. 

***wireless keyboard with rechargeable batteries— connect the charging cable, this will make the wired keyboard successful Safe Boot your Mac.

unplug all non-essential peripherals when testing

Uninstall all third party apps that are Cleaners/Optimizers/VPN/Anti-Virus

all known to cause issues on the macOS

reinstall the macOS on top of your existing macOS if necessary

Recovery (both M1/M2/M3/M4 and Intel) — How to reinstall macOS - Apple Support

no resolve—

Call Customer Support (800) MY–APPLE (800–692–7753)

or on line https://getsupport.apple.com/

or call AppleCare Support at 1-800-APLCARE (800-275-2273)

Outside the USA—Contact Apple for support and service by phone

See a list of Apple phone numbers around the world.

Contact Apple Support - Apple Support

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verify these features did not get turned on

Fix for 789uiojkl keys or numeric keypad not working

Fix for 789uiojkl keys or numeric keypad … - Apple Community

>System Settings>Accessibility >Keyboard>Full Keyboard Access>OFF

ref:Navigate your Mac using Full Keyboard Access - Apple Support

Navigate your Mac using Full Keyboard Access - Apple Support

if it is a hardware issue take it in

In or out of warranty you can get a free over the counter 'Apple Service Diagnostics' test /assessment

Make an appointment for a "hardware issue"

Genius Bar Reservation and Apple Support Options - Apple

Outside the USA

Contact Apple Support - Apple Support

Call Customer Support (800) MY–APPLE (800–692–7753)

or on line https://getsupport.apple.com/

or call AppleCare Support at 1-800-APLCARE (800-275-2273)

Outside the USA—Contact Apple for support and service by phone

See a list of Apple phone numbers around the world.

Contact Apple Support - Apple Support