The company had sold 12,154 units in December 2015.
Sales of heavy and medium commercial vehicles also fell by 9 per cent to 8,782 units last month as against 9,703 units in the year-ago period, the company said in a statement.
Light commercial vehicle sales saw a fall of 20 per cent at 1,949 units as compared to 2,451 units in December 2015, it added.