The penalty is the largest ever issued by the regulatory agency. “Today’s action holds Fiat Chrysler accountable for its past failures, pushes them to get unsafe vehicles repaired or off the roads and takes concrete steps to keep Americans safer going forward,” U.S. Transportation Secretary Anthony Foxx said in a statement. The automaker could be required to pay another $15 million if an independent monitor discovers additional violations. The order requires FCA to offer to buy back more than half a million vehicles with defective suspension parts that could cause the vehicle to lose control. Fiat Chrsyler will have to repair and then resell the vehicles. Fiat Chrysler also announced Saturday it would recall 667,406 Ram trucks in North America to prevent the inadvertent deployment of side-curtain air-bags.