This B203 error came up directly after I did a firmware update, which I had been ignoring for months. Now I wish I would've kept ignoring it because even after multiple tries of the ideas above, my printer is still not working and is less than 2 years old. I'm highly disappointed since this printer is not used that often so should not be having these kinds of issues after such a short period of time.
I don't tend to be a conspiracy theorist, but I can't help but wonder if that firmware update was the culprit of my printer's failure. I'm disappointed in this Canon product and will probably go back to Epson, even though the cost of ink is pricier, but the machines seem to last a lot longer.