New Delhi, May 12 -- Tata Group chairman Natarajan Chandresekaran has reasons to worry about the flagship automotive business. For Tata Motors, the country's third-largest passenger vehicle player, the battle on all business fronts is getting tougher.

The company's passenger and commercial vehicle sales are falling, and its British crown jewel, Jaguar Land Rover, is facing the threat of increased tariffs from the US.

What was its fiefdom even a couple of years back is now being challenged by increasing competition in electric vehicle space from companies such as JSW MG Motor India Private Ltd, Mahindra and Mahindra Ltd, and Hyundai Motor India Ltd.

The market share of Tata Motors in the electric car segment declined from 73.5% in March...