The National Highway Traffic Safety Administration (NHTSA) on Wednesday asked Tesla Inc to recall 158,000 Model S and Model X vehicles over media control unit (MCU) failures that could pose safety risks by leading to touchscreen displays not working, Reuters reports. 

The auto safety agency made the unusual request in a formal letter to Tesla after upgrading a safety probe in November, saying it had tentatively concluded the 2012-2018 Model S and 2016-2018 Model X vehicles “contain a defect related to motor vehicle safety.”

Tesla did not immediately respond to a request for comment but it must respond to NHTSA by Jan. 27. If it does not agree it must provide the agency “with a full explanation of its decision.”

It is unusual for the agency to formally demand a recall. Automakers typically voluntarily agree to a recall if sought in discussions by regulators.

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