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Yes, If you are landed immigrant, you are not allowed to drive the car if this car has outside Canada licence plate. You have to import your car at the time of landing. There is a $182.00 CAN processing fee for that. After that you have 30 days to register your car in Candian motor vehicles office.
I guess this will answer your question, for more info please contact your lawyer or department of motor vehicle in Canada.
All the best.