Reduced Engine Performance message 2012 Volvo C70

What is your question?

After having rear brakes replace I got an error message "Reduced Engine Performance" Is there a connection here? What else could be wrong.

What makes this problem better or worse?

I stopped driving it as soon as the message came on

How long has your 2012 Volvo C70 had this problem?

It just happened today after having a rear brake job.