Stocks in two best carmakers tumbled when they warned that adjustments to industry insurance policies had been hurting performance.
General Motors mentioned it expected a hit of approximately $1bn (£760m) due in large part to higher steel and aluminium costs resulting from new US metals price lists.
Stocks dropped by way of more than 7% after the firm revised its outlook.
Fiat-Chrysler shares have been approximately 15% decrease, after it stated gross sales in China had fallen as consumers postponed purchases in anticipation of lower price lists.
The warnings give an insight into how transferring business policies are affecting carmakers and different producers.
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The forecasts got here amid disappointing quarterly results.
Fiat Chrysler earnings larger FOUR% within the quarter to just about $29bn, but earnings tumbled by means of 35%.
It noticed sales, particularly of Maseratis, hunch 35% as shoppers in China waited for decrease price lists on international automobiles to come back into effect.
The firm expects the ones to rebound, but will be grappling with the country’s new emissions rules.
Sales and earnings at GM were about $36.8bn, down almost 1% in the 3 months to the tip of June, in comparison with the same duration final yr.
The firm mentioned profit was approximately $2.4bn, down about 2.8% 12 months-on-yr.
The effects came despite profits within the US, the place the selection of vehicles offered to dealerships higher through 4.6% amid larger demand for pickup trucks.