DETROIT — In a signal moment for the turnaround of the American auto industry, General Motors is edging toward a public stock sale, and its profits are now solid enough that the demanding CEO will step aside, saying his work is done.

GM said Thursday it made $1.3 billion from April through June, its second straight quarter in the black and a complete reversal from last year, when it was forced into bankruptcy and the U.S. government took a majority stake.

CEO Ed Whitacre said he would leave his post Sept. 1. He said the GM board knew all along he would do so after the company returned to health, and industry analysts said it was an important step leading up to the stock sale.

Whitacre, who will stay on as chairman through the end of this year, will be replaced as CEO by Daniel Akerson, a 61-year-old former telecommunications executive who sits on the GM board.

While executives would not discuss the stock sale Thursday, GM was expected to file its initial paperwork with federal regulators as early as today.

"Things look good. There's a foundation in place, a good foundation," said Whitacre, who was drafted out of his first retirement by the government to fix the troubled GM. "I believe we've accomplished what we set out to do."

Last year, GM lost nearly $13 billion in the second quarter alone. In the first six months of this year, GM made $2.2 billion as cost cuts took full effect, sales in China grew and people paid more for GM's revamped vehicles in the U.S.

For example, GM's crossovers, which are similar to SUVs but built on car undercarriages, are fetching $3,000 more this year than last.