Spain’s antitrust regulator CNC said on Wednesday it is investigating possible price fixing in the country by automakers such as Volkswagen, Renault, Peugeot, Toyota, General Motors and Ford.

The probe will examine evidence that affiliates of those automakers and more shared market-sensitive information to set prices and service contracts.

“These are considered very serious [alleged] infringements that could lead to fines of up to 10 percent of total [Spanish] annual turnover,” the CNC said in a statement.

The investigation, which targets both the companies and their Spanish distributors, was a priority “given the serious consequences for consumers,” the CNC said.

A Seat spokesman said the group was aware of an investigation at some of its showrooms, while a spokeswoman at Renault in Spain said the company had not broken any competition laws. Opel and Ford has no immediate comment.

Spanish carmakers have struggled for business against the backdrop of a five-year economic slump that, along with an unemployment rate above 25 percent, has depressed demand for consumer goods.

They have been able to draw on a government scheme to subsidize purchases of new cars, extended by 70 million euros ($92 million) in July after an initial program expired.

Under the scheme, people who scrap their old car and buy a new one get a rebate of 2,000 euros, half from the government and half from the carmaker.

But sales of new cars in the country dropped 18 percent year-on-year in August, manufacturers’ association Anfac said on Monday.

The CNC said the probe will be based on data gathered in June and July during inspections of showrooms and the headquarters of the main car brands present in Spain.

Spain’s car manufacturing sector has been helped by labor market reforms which made it easier for firms to hire and fire workers.