Tata Motors reported on Tuesday a loss for the three months through June, hurt by higher raw material costs.
The automaker said it made a net loss of Rs 1,902 crore ($277 million), compared with a profit of Rs 3,182 crore in the same quarter a year ago.
Changes to the way JLR's pension payments are calculated had resulted in a one-time gain of Rs 3,609 crore last year.
Total expenses during April-June rose about 17 per cent to Rs 69,890 crore.
Shares in Tata Motors closed 1.46 per cent lower at Rs 263.60 apiece on the NSE, ahead of the release of quarterly earnings.
($1 = Rs 68.5825)