Lordstown Motors, the electric vehicle start-up fighting for survival, announced on Monday the resignation of its chief executive, Steve Burns, and chief financial officer, Julio Rodriguez, after the results of a board investigation into an investor’s report questioning the company’s viability and statements about customer interest in its electric trucks.

The resignations are effective immediately, and Lordstown has hired an executive search firm to find their replacements.

The company released the results of an investigation by a committee of its board into a March report by Hindenburg Research, a bearish investor, which took aim at Lordstown shortly after it went public last October.

The committee found the report was “false and misleading” as it pertained to the viability of Lordstown’s technology and its timeline for rolling out vehicles. Still, the company’s report, led by the law firm Sullivan & Cromwell, acknowledged “issues regarding the accuracy of certain statements regarding the company’s pre-orders.”

Lordstown warned last week it did not have enough cash to start commercial production of its electric pickup truck and might have to close its doors. The company has been the subject of an investigation by the Securities and Exchange Commission focusing in part on its merger with a special purpose acquisition company, or SPAC, last October. Sullivan & Cromwell served as an adviser on the merger.

The S.E.C. has sent at least two subpoenas to Lordstown seeking information related to its statements about customer orders for trucks.

The resignations comes just a week before Lordstown was scheduled to host an event at its factory for investors, analysts, customers and partners. The company intended to showcase work on its Endurance electric truck.

Mr. Burns was the driving force behind Lordstown — founding the company just months after he stepped down as chief executive at Workhorse, another electric vehicle company. The company was born shortly after General Motors announced it was shuttering the Ohio factory and struck a deal to finance the sale of the factory to Lordstown.

Lordstown was one of the first big mergers of a start-up with no profits and a SPAC, a holding company that raises money from investors in the hopes of finding a merger partner. Lordstown’s deal with the SPAC, Diamond Peak Holdings, was announced in August and closed just a few months later. The company raised $675 million as part of the merger.

The company said on Monday that it had appointed its lead independent director, Angela Strand, as executive chairwoman while it looks for a permanent chief executive. Becky Roof will serve as interim chief financial officer.

One of the members of the board committee that ordered the law firm’s report was David T. Hamamoto, a sponsor of the Diamond Peak SPAC.

Lordstown, in announcing last week it may not have enough money to survive, also said it had found material weaknesses in it financial reporting system.

Shares of Lordstown plummeted about 15 percent in premarket trading after the news was announced.