A few days after being accused by the Environmental Protection Agency of cheating on its emissions tests, Fiat Chrysler is now being investigated by the Justice Department for failing to disclose secret software that allegedly facilitated the fraud, according to Bloomberg.

Earlier this week, an EPA administrator said FCA’s software appeared to be in violation of the Clean Air Act and was likely contributing to “illegal pollution.” The EPA stopped short of calling the software “defeat devices,” but has sent a request to Fiat Chrysler asking them to prove otherwise. The vehicles in question include Jeep Grand Cherokees from 2014 to 2016, and Dodge Ram 1500 Trucks.

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