Trying to diagnose multiple errors

I have a 2017 Mazda 6 which recently starting throwing a 3 errors. The errors are:

1) Battery management system malfunction
2) Smart brake system malfunction
3) Front Radar Sensor system malfunction

First thing I thought of when seeing those 3 errors was must be a failing battery. A quick google search seemed to confirm thats probably the issue. I took out my multimeter and got a reading with the car off which came back at 12.4V and when I started it up it jumped up to 14.0V. Those numbers seem to indicate the battery and/or alternator isn't the issue as I shouldn't have problems at those levels (someone correct me if I'm wrong).

The car is running great, zero start up issues or other mechanical or electrical issues. I'm not really sure what could be causing these 3 errors and was wondering if anyone else has delt with these issues before and if they were able to determine what the root cause of them were.

Any help or advice would be greatly appreciated.
 
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