The Environmental Protection Agency says Fiat Chrysler didn't disclose software features in a control system.
Nicholle Torrez left her home in Denver for a short trip and vanished in 2006.
Police in Northglenn are investigating after a body was discovered amid an apartment fire Friday morning.
The EPA said Dodge Rams and Jeep Grand Cherokees had software that allowed them to increase emissions.
The actor died Sunday when his car rolled and trapped him against a security gate and a brick mailbox.