Boisclair entered the pleas in a Quebec City courtroom Thursday morning.
The 51-year-old was arrested last November after his car struck a lamppost.
He has also had his driver’s licence suspended for a year.
READ MORE: André Boisclair to respond to allegations
Boisclair was granted an absolute discharge, which will allow him to continue travelling back and forth to the United States.
READ MORE: André Boisclair leaves diplomatic post
The longtime provincial politician served as PQ leader between November 2005 and May 2007.