The Department of Justice has sought documents related to vehicle range and “personal benefits,” Tesla said.
The chief executive of Tesla testified in a federal civil trial about a 2018 plan to take the automaker private that fizzled out.
Investors are seeking billions of dollars in damages for their losses after Mr. Musk posted a proposal on Twitter that never materialized.
Tesla said it expected capital expenditures to be $6 billion to $8 billion in 2022, up from an April forecast of $5 billion to $7 billion.
The regulator questioned whether the Tesla chief executive had disclosed his stake at the right time.
Mr. Musk has been building a stake in the social media company and last week made an unsolicited offer to acquire it outright.
The electric carmaker disclosed the new legal issues in its annual report to securities regulators, which was made public on Monday.
The 2018 tweet, in which Mr. Musk claimed he had secured funding to take Tesla private, initially sent the automaker’s shares soaring. But they sank when it became clear that no such deal had been reached.
The company updated registration documents with the Securities and Exchange Commission on Monday.
The activist short-seller behind Hindenburg Research has become known for research that sends companies’ stock sinking. He says he’s not in it just to move share prices.