WASHINGTON (AP) — It won't be an easy job.

Whoever becomes the new chairman of Tesla Motors will face the formidable task of reining in Elon Musk, the charismatic, visionary chief executive with an impulsive streak, while also helping Musk achieve his dream of turning Tesla into a profitable, mass-market producer of environmentally-friendly electric cars.

Musk is giving up the chairman's role under a settlement announced Saturday with the Securities and Exchange Commission. Besides a new chairman, Tesla was also ordered to appoint two new, independent members to its board. A more assertive board could provide the kind of tighter oversight that many legal experts, and Tesla investors, say is overdue for a company of Tesla's market value. Shares in the company surged 15 percent in premarket trading.

The settlement stemmed from a lawsuit the SEC filed charging Musk with misleading investors in August with a tweet that said he had "funding secured" for taking the company private.

Yet a more forceful board, coupled with a domineering CEO like Musk, could create conflicts at a risky time for the company. Visionary CEOs such as Apple's Steve Jobs and Twitter's Jack Dorsey have been forced out by strong boards of directors, though both eventually returned to their companies.

Even with the settlement, Tesla faces a daunting array of challenges.