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A report suggests the company may be preparing to drop its 'EcoDiesel' branding.

Fiat Chrysler Automobiles has reportedly resumed production of the Ram 1500 diesel after a year-long hiatus related to the government's investigation into alleged emissions violations.

Factory workers have told Automotive News the company is building only a handful of diesel-powered pickups per shift.

The company has not announced any progress in its ongoing negotiations with the Environmental Protection Agency and California Air Resources Board. As it stands, the Ram 1500's 3.0-liter turbodiesel V6 is not certified in the US and cannot be sold by dealers until regulators approve.

The company last month filed for certifications after developing new emissions software to address the alleged violations. If approved, the same software will likely be installed in 2014-2016 vehicles that were included in the EPA's notice of violation.

The latest report suggests FCA may be preparing to drop its 'EcoDiesel' branding when the vehicles return to the market.