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Updated: Service and Parts Hours of Operation:

Monday – Friday 8:00AM – 5:00PM
Saturday – Sunday: Closed

Updated: Sales Hours of Operation

Dealership Showroom: Open for business! By Appointment Only

Online Sales Department: Open 24/7

How to Contact Roy Foss Thornhill

Phone: 905-886-2000
Fleet Clients:

Other Important Contact Information

General Motors Canada: 1-888-221-1687
Roadside Assistance: 1-800-268-6800

GM Financial
Phone: 1-800-465-4591

RBC: 1-800-769-2511
ScotiaBank: 1-800-4SCOTIA
TD Bank: 1-866-694-4392

Update to OnStar and Connected Vehicle Services

OnStar is empowering more than 1 million current Chevrolet, Buick, GMC and Cadillac connected vehicle owners with the helpful resources they need during these trying times.

  • For added peace of mind, we are enabling OnStar Crisis Assist services for all of our connected vehicle owners for a limited time, which includes:
    • Access to specially trained OnStar Advisors who are ready to help 24/7 during emergencies and other unexpected situations.
    • Special routing assistance, including to hospitals or clinics.
    • Connecting to family members, Emergency Medical Dispatch and First Responders.
  • To help stay connected, we are offering complimentary 3GB/3 months (whichever comes first) of in-vehicle data for all of our Wi-Fi-equipped vehicle owners. Customers can:
    • Connect to their work or classroom remotely while within 15 metres of the vehicle.
    • Stay connected with family members or others in need while traveling within the vehicle.
  • Be assured that our OnStar Advisors are ready to help with the best and latest information, thanks to our partnerships, trainings and open communications with the Canadian Public Health Services and other public safety professional associations.


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(888) 630-4944

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7200 Yonge Street • Thornhill, ON L4J 1V8

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Today's Hours:

Open Today! Sales: 9am-5am

Service: Closed

Parts: Closed

Roy Foss Thornhill

7200 Yonge Street Thornhill, ON

Phone: (888) 630-4944


Phone: (888) 823-8238

7200 Yonge Street Thornhill, ON


Phone: (888) 630-4944

7200 Yonge Street Thornhill, ON


Phone: (888) 357-0382

7200 Yonge Street Thornhill, ON
43.802789 -79.422113
Roy Foss Thornhill 43.802789, -79.422113.