California air regulators on Wednesday urged automakers and engine manufacturers to disclose by the end of the year any unapproved hardware or software programs that compromise a vehicle's emissions control system. The letter from the California Air Resources Board follows a string of penalties against automakers for using software to evade emissions requirements since 2015, including Volkswagen Group, Daimler AG and Fiat Chrysler Automobiles.
California noted it has other pending emissions investigations and said "voluntary disclosure will trigger a reduction in penalties; failure to do so may affect the result of future enforcement actions."
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