The federal agency has filed an application with the Competition Tribunal seeking $30 million in administrative penalties and refunds for consumers from Aviscar, Budgetcar and Avis Budget Group Inc.
The bureau alleges Avis and Budget advertise prices that are not attainable due to additional fees imposed during the rental.
It also says the fees are characterized as taxes, surcharges and fees that governments and agencies require Avis and Budget to collect.
"In fact, Avis and Budget impose these charges to recoup part of their own cost of doing business," the bureau said.
"As a result, consumers end up paying higher prices or receiving lower discounts than advertised."
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