Run your printer on service mode
Running the printer on service mode can also troubleshoot your Canon G2000 5B00 error. You can follow the given steps for running the printer on service mode:

Press the Stop button
Turn off your Canon printer
Hold and press the power button of your Canon printer
Wait for about 4-5 seconds until the blue light glows
Now press the Stop button 6 times. When you press the button, each time the color of the bulb changes. After pressing the button 6 times, the bulb glows blue.
Release the Power button
The blue light will start flashing. Wait for about 30-40 seconds until the blue light gets stable. Now your printer is running in service mode. Connect the printer to the computer and check whether your error 5B00 Canon G2000 gets fixed or not.