DETROIT (NEWSnet/AP) — Federal prosecutors have expanded investigation into Tesla beyond the electric vehicle maker's partially automated driving system.

Prosecutors have issued subpoenas for information instead of simply requesting it, the company disclosed Monday.

In a quarterly report filed with U.S. Securities and Exchange Commission, Tesla said U.S. Department of Justice is looking into “personal benefits, related parties, vehicle range and personnel decisions.”

The additional investigation topics and subpoenas suggest prosecutors have broadened their inquiry, and they have found the need to force Tesla to disclose information, legal experts say. The filing indicates prosecutors may be investigating Tesla CEO Elon Musk, and whether the company has been candid in describing the features of its vehicles.

In January, Tesla disclosed that the Justice Department had requested documents related to its Autopilot and “Full Self-Driving” features. Both features are classified as driver-assist systems, and the company says on its website that the vehicles cannot drive themselves.

The company is disclosing a probe that is “a lot wider than just looking at Autopilot and FSD features,” said Erik Gordon, a  business and law professor at University of Michigan. “The DOJ often starts with a formal written request and escalates to administrative subpoenas if it thinks it isn't getting full cooperation,” he said.

Copyright 2023 NEWSnet and The Associated Press. All rights reserved.