Is OnStar owned by Opel/Vauxhall? No.  OnStar is a service owned and operated by OnStar Europe Limited, a General Motors company. Why is the OnStar service ending? Operation_Services In August 2017, Groupe PSA bought the Opel and Vauxhall car brands from General Motors.  OnStar Europe Limited was not part of this purchase and continues … Continue reading FAQ 2020