Apparently "a misspelling" of concourse because it cannot be found in a dictionary; however, some automobile companies are using the term for specific car models.

You are advised to use concourse if you are referring to an assemblage; a gathering, a large open space for accommodating crowds; as in, a railroad station, a park, or an airport; an act or an instance of running or coming together; a confluence; such as, a concourse of events, etc.