Police said the incident involved a 19-year-old woman and that she did not sustain any physical injuries, but provided few other details.
Police announced a charge against the instructor on Monday.
Imran Malik, 45, of Milton has been charged with sexual assault.
Police said he is not currently employed by a driving school, though it is believed a driving school in Brampton employed him prior to the alleged offence.
Police said that the investigation remains ongoing and that they believe there may be more victims. Investigators are asking anyone with information to contact police.
