Celadon Group Inc. has agreed to pay $42.2 million to settle a federal investigation into allegations that a prior management team and a subsidiary company filed false and misleading statements to investors regarding tractors and trailers leased to owner-operators.

In a joint letter to U.S. District Judge Alison Nathan, Tesla Inc.’s top executive and the securities regulator said they haven’t been able to resolve a legal dispute over how Musk posts news about his electric-car company. The judge agreed and gave them until April 25.

Elon Musk, already in hot water over his Twitter use, posted another Tesla Inc. production forecast reminiscent of the one that landed him before a federal judge earlier this month.

Volkswagen AG and its former CEO were sued by the U.S. Securities and Exchange Commission over claims they failed to disclose to investors that diesel vehicles violated emissions standards, the latest twist in a software cheating scandal that already has cost the company more than $30 billion.

Elon Musk is facing a new round of regulatory trouble for tweets about Tesla Inc., raising fresh concerns about the chief executive officer’s ability to keep his impulses in check and responsibly run a public company.

The Securities and Exchange Commission is investigating whether Nissan Motor Co. accurately disclosed its executive pay in the United States, according to several people familiar with the matter, compounding the carmaker’s woes as it grapples with the aftermath of former Chairman Carlos Ghosn’s arrest.