The EPA, along with the California Air Resources Board, accused FCA in January of 2017 of using eight undeclared pieces of software code in certain Fiat Chrysler diesel vehicles. That, naturally, led to "substantially" higher than allowable levels of nitrogen oxide emissions. The violation applies to about 104,000 vehicles sold between 2014 and 2016. EcoDiesel production was stopped in late 2016.
FCA says it's continuing to cooperate with the EPA and CARB. Assuming the two agencies approve the plan, the automaker will recall 2014-2016 Ram and Jeep Grand Cherokee vehicles to install the new code. We'd assume that same updated software will be used in 2018 EcoDiesels, too, again assuming they get EPA approval.