Battery light turned on with code P0622

Almost a week ago my battery light started coming on occasionally. Turning on the the car 3 times in a row gives me the error P0622.

On day 2 I believe my battery discharged enough that the automatic shifting was failing and when I pulled over I could not start the car. I got a boost, drove home, and hopped on the motorcycle.

First I replaced the battery as existing was already 6 years old. The last 3 days my battery light is on when I start my day and drive to work. Running errands after work, the light goes out.

When the battery light is on my multimeter reads the regular 12+V range for the battery - so battery is not receiving a charge.

When there is no error light my multimeter reads a charge, I think it was just over 14.

I plan to test the pulley on the alternator after work today.

I'm wondering if it could be a computer/voltage regulating issue based on the error code. What else should I check for? Cleaning connections? Replacing fuses?

Any advice would be very welcome. Thanks!