Learn about error codes that may be displayed on your camera’s LCD when there is an error. This post includes information and next steps for codes Err 01, 02, 04, 05, 06, 10, 20,30, 40, 50, 60, 70, 80, and 99.
What you see
When there is an issue with the camera, an error message is displayed on the LCD.
Message and Next Steps
Err 01 - Communications between the camera and the lens is faulty. Clean the lens contacts on the camera and lens.
Err 02, 04, 10 – Card cannot be accessed. Reinsert/change card or format card with camera.
Err 04 – Cannot save images because card is full. Replace the card.
Err 05, 20 - The built-in flash could not be raised.
Err 06 - Sensor cleaning could not be performed.
ℹ️ Turning the sensor cleaning mode off in the menu may allow for continued use until service can be scheduled.
Err 10, 20, 30,40,50,60,70,80 or 99 – An error prevented shooting.
I have an EOS 1DMk3 that I purchased second hand many years ago. It will work fine for a while and then throw an Err99. I turn it on and off, I swap batteries, and still, it's Err99. So, I park it for like 6 months, put a newly charged battery in it and then it suddenly works. It will work perfectly for a while. Then it throws Err99 again, but if I keep trying to shoot eventually it starts working again for as long as I use it. When I turn it on again the process of Err99, continual shutter attempts makes it work again. I know the camera is no longer serviced, but I'd like to know if there is anything I'm missing that could make the camera a more reliable shooter? Regards, Tim Murphy