Maximum time this error will activated due to miss allignes ink cartridge . Before apply any major steps for [https://printerfaq.com/canon-error-b203-working/|printer error B203] . You should check your ink cartridge.
some time it indicates the empty ink cartridge. Maximum printer is running on two different kinds of ink cartridges. then it might possible that one of them is empty and that is causing error. Refill the cartridge to resolve the error.
Try to reconnect the printer.
If not then update the printer driver.