Electric-vehicle startup Lordstown Motors Corp. said Wednesday it is on track to start limited truck production in late September and is in talks with multiple partners about deals that could potentially lead to cash infusions.

The company, in releasing second-quarter financial results, said that it plans to begin commercial deliveries of its first electric truck, the Endurance, to customers in the second quarter next year. Lordstown plans to complete the necessary validation and regulatory approvals in December and early 2022.

To generate additional revenue, company executives said they are in talks to offer unused space in the 6.2 million square-foot factory acquired from General Motors Co. two years ago to companies that need ready-to-go manufacturing facilities.

“This is a critical strategic pivot for us,” said executive chairwoman Angela Strand on the company’s earnings call.

Interim Chief Financial Officer Becky Roof later in the call said she felt the book value of the assembly factory at $45.5 million was significantly undervalued and will be reappraised with third-party evaluators.

Lordstown, which posted a $108 million loss in the April-to-June period, revised its financial outlook for a second consecutive quarter, saying it plans to again increase capital expenditures and costs related to R&D and general administration.

The Ohio-based manufacturer, which booked no net sales revenue for the quarter, ended the period with $366 million in cash. The company expects to finish the third quarter with more than $225 million on hand, barring any additional capital raise. Lordstown had said in May it could run low on cash by the year’s end, closing 2021 with $50 million to $75 million.

The company’s stock was up 5% in after-hours trading.

Lordstown Motors’ performance has been under scrutiny, following a warning in June that without additional funding it couldn’t scale commercial truck production and had serious doubts about whether it could survive another 12 months.

The two-year-old company is one of several electric-vehicle startups that went public last year in well-received listings but has more recently struggled to execute on plans.

Lordstown Motors, which took over the former GM plant in Ohio with aims of converting it to build electric pickup trucks, had a challenging second quarter with the departure of several top executives in June. They included the founder and chief executive, Steve Burns, and the chief financial and operating officers.

In May, Ford Motor Co. said it would bring a battery-powered version of its bestselling F-150 pickup to market next year, with plans to price it more than $10,000 lower than Lordstown Motors’ $52,500 debut truck.

Short seller Hindenburg Research LLC took aim at the company earlier this year, releasing a report in March that claimed Lordstown Motors was misleading investors and overstating the demand for the Endurance. A special board committee, formed to investigate the short seller’s allegations, found some company statements around its truck preorders were inaccurate but rejected the report as false and misleading in significant respects.

The startup in recent months has additionally disclosed that both the Securities and Exchange Commission and the Justice Department are investigating aspects of its business. Matters under scrutiny include the SPAC merger deal last fall that took Lordstown public and its representations to investors about truck preorders.

In a sign that its legal challenges continue to weigh on results, the company reported spending more than $15 million on lawyers and consultants, primarily stemming from the special committee and SEC investigations.

Write to Ben Foldy at Ben.Foldy@wsj.com