Photo of 3.0L V-6 diesel courtesy of FCA.

Photo of 3.0L V-6 diesel courtesy of FCA.

Fiat-Chrysler has applied for certification for its diesel-powered 2017 Ram 1500 and Jeep Grand Cherokee, and intends to modify the emissions software of current models to resolve a dispute with regulators.

FCA has been unable to sell 2014 to 2016 models since January, when the EPA and California Air Resources Board issues notices of violation that the diesel 3.0L V-6 powering the vehicles emitted increased levels of nitrogen oxides.

FCA intends to install modified emissions software in the 2014 to 2016 vehicles to resolve the claims. With he updated software calibrations, FCA plans to improve the "emissions performance and does not anticipate any impact on performance or fuel efficiency."

The automaker has been in discussions with officials from the U.S. Department of Justice's Environment and Natural Resources Division.