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I have heard some people complain that they receive an error code #99 when operating their Canon Eos DSLR cameras. The Error code 99 is a general error, that could indicate a number of problems, most often related to the contact points between lens and camera, or between your storage medium and the camera.

I got the following advice from a Canon helpdesk in India when I had similar problems. Please try them first before starting to panic.

A. You receive an Error 99

1. Turn off your camera.
2. Remove the lens, any batteries, and your SD/CF card.
3. Allow the camera to sit without power for approximately 15 minutes.
4. Insert a fully charged battery, and turn on the camera. Do NOT insert your memory card.

5. Depress the shutter button as you would to take a picture.

Does the “ERR 99″ message appear? If it does, then the camera should be
serviced. Bring it in to the closest Canon dealer or the shop where you bought it.  If it does not, then please proceed to the next set of steps:

1. Turn off the camera.
2. Insert the SD/CF card.
3. Turn on the camera.
4. Format the SD/CF card in the camera. Make sure you made a backup of all the pictures on the card.
5. Depress the shutter button as you would to take a picture.

Does the “ERR 99″ message appear? If so, then the CF card is the most
likely source of the issue. Try using a different card.

If the message does not appear, please complete the following steps:

1. Turn off the camera.
2. Clean the lens contacts by gently rubbing them with a pencil eraser
or soft cloth. Be careful that you do not let any debris fall into the
camera body.
3. Reattach your lens.
4. Turn on the camera.
5. Depress the shutter button as you would to take a picture.

If the “ERR 99″ message only appears when one particular lens is
attached, then that lens should be examined by a service technician.

If you see the “ERR 99″ with a different Canon lens attached, then the
camera should be serviced.