Tesla Model S and Model X owners have complained about potentially dangerous flaws with suspension systems at least since 2015. On Friday, the government took action — the Chinese government.

China’s State Administration for Market Regulation ordered a recall for about 30,000 Model S and Model X cars manufactured at Tesla’s Fremont plant and exported to China. The affected cars were built between 2013 and 2017.

Model S and Model X cars sold in the U.S. and Europe were built at the same factory using the same suspension systems. More than 250,000 were sold worldwide.

The traffic safety regulator for the United States, the National Highway Traffic Safety Administration, has not yet responded to a request for comment. Tesla has dissolved its media relations department and stopped responding to media inquiries in 2019. Emails to Tesla chief executive Elon Musk and to the defunct media relations department did not receive an immediate response.

The China agency recall offered little detail. The recall does not involve the Tesla Model 3, including the made-in-China version Tesla began assembling at its new Shanghai factory late last year.

Tesla owners at the Tesla Motor Club forum have been complaining about suspension issues since at least 2015, complaints that continue to this day. Many report that a ball joint connected to a control arm comes loose.

The company has issued service bulletins in the U.S. directing Tesla employees to replace suspensions parts on cars that are brought in with relevant mechanical problems or to have the wheels aligned. The bulletins call the issue a “known non-safety-related condition.”

Given the way accident statistics are collected in the U.S., it’s difficult to determine whether the suspension issues caused highway deaths or injuries, and if so, how many. NHTSA has not released such figures. Insurance companies collect such data but keep it confidential.

In the past, Tesla has attempted to keep a lid on the suspension problems. In 2016, the auto industry news site Daily Kanban reported that Tesla was repairing suspensions outside the owner’s warranty coverage. The article quoted from a Tesla “goodwill” repair contract that required that the Tesla owner keep the agreement confidential and agree not to sue the company based on suspension issues.

After the non-disclosure requirement prompted a media stir, Tesla dropped it.

In the U.S., automakers are required to issue voluntary recalls for safety-related defects. In a 2014 tweet, since deleted, Musk declared that “the world ‘recall’ needs to be recalled.”