Hello Andyroo,
There are a few troubleshooting steps I'd like to try to resolve this issue.
- Anything you attach or install in the camera — memory cards, lens, battery, grips should be removed.
Once the lens is off let's check it using the steps below.
- Clean the lens contacts to restore connection with the body.
**Warning** - Do not clean lens contacts on either a Canon lens or the camera body with an eraser! It's incredibly easy to rub off the gold plating on these contacts, and end up with data communication problems! Our strong recommendation is to use a soft, clean, micro fiber cloth. Again, please do not use anything abrasive.
- Try using a different EF lens (we recommend to try this with a Canon-brand EF lens, doesn't have to be the same focal length as the one you were using) there can sometimes be communication error issues related to certain third-party lenses on EOS bodies and checking this with a Canon-brand lens eliminates this as a possible factor.
If the issues seem to persist the next step would be to send the equipment to Canon for service.
You may fill out an online repair request form at the following link to setup your repair using our online service.
https://www.usa.canon.com/internet/portal/us/home/support/service-repair
Did this answer your question? Please click the Accept as Solution button so that others may find the answer as well.
