Brexit-related worries and a global shift away from diesel cars both in Europe and North America along with the impact of China-US trade tariffs is also hurting the maker of Land Rover Discovery and Evoque sport-utility vehicles and Jaguar XE and XF cars.
Tata Motors risks sinking deeper into junk as its earnings wane. Sales rose by a fifth year on year in the quarter in the USA and by 18% in the UK.
The group disclosed that the automotive industry is "facing significant market, technological, and regulatory headwinds".
Last month Jaguar Land Rover joined Honda and Toyota in announcing a post-Brexit temporary plant shutdown, which will affect all three of its United Kingdom auto factories, as well as its engine plant in Wolverhampton.
The step raises questions on whether it could affect Tata Motors' credit rating that has already been revised downward in the recent past.
"In JLR, the market conditions continue to be challenging particularly in China".
Italy denies it will ban Huawei from 5G rollout
And German media reports that that country's government is also not keen to implement a full ban. Germany has said it wants high data security standards for its 5G network.
Name of UK-built Mars rover revealed
Rosalind Franklin was a London-born biologist, physicist, chemist and X-ray crystallographer . Franklin herself was excluded, even though her work was key to the discovery.
Hazard and Higuain share footballing language, says Sarri
The midfield maestro is now firmly established as one of the best players in the world. "But I'm not at all selfish. In an interview with French radio station RMC, he stated: "I know what I am going to do".
"Tata Motors has bitten the bullet", Ajay Bodke, the Mumbai-based head of investment strategy at Prabhudas Lilladher Pvt Ltd said by phone. It has also streamlined its commercial policies to help compensate for retailers' losses, and is launching extensive on-site training programmes to improve the customer experience as well as operations.
Tata Motors said it wrote down its JLR investment due to hard market conditions and expanding debt.
The parent's net loss was 270 billion rupees (S$5.1 billion) in the three months to end-December, exceeding the deficit reported by Indian Oil Corp in 2012.
The share price of Indian conglomerate Tata Motors fell 17 per cent today after it posted the biggest-ever quarterly loss in Indian corporate history of about £3.1bn.
The company said that JLR announced its plans in January to achieve 2.5 billion pounds of investment, working capital and profit improvements by March 2020. Despite the muted growth, Tata Motors has delivered strong results, registered an impressive profitable growth this year on the back of exciting products, renewed brand positioning and aggressive cost reduction.