General Motors Co. will "move quickly" to wind down the Saturn brand after a deal to sell the line unexpectedly fell through, the company's treasurer said Thursday.

The auto maker is eager to shed the four money-losing brands - Saturn, Pontiac, Hummer and Saab - slated to go as part of GM's government-run restructuring.

GM had hoped to sell Saturn to Penske Automotive Group Inc. (PAG), but the deal collapsed on Wednesday after Penske failed to secure an agreement to have France's Renault SA (RNO.FR) supply autos for dealers once GM stops building Saturns in about two years.

Without a buyer for the brand, the Saturn dealer network will cease to exist by October 2010, but many dealerships could close before than.

"We will move quickly to wind down Saturn so we can get on with the four core brand strategy," GM Treasurer Walter Borst said, speaking at an analysts' conference in Scottsdale, Ariz.

The auto maker is "redoubling" efforts to finalize a deal to sell Hummer to China's Sichuan Tengzhong Heavy Industrial Machinery Co., and anticipates the sale will close by the end of the year, Borst said.

The Hummer deal hinges mainly on Tengzhong's ability to gain Chinese regulatory approval for the sale.

Meantime, GM is awaiting word from the Swedish government on whether it will provide funding to sell Saab Automobile AB to sportscar manufacturer Koenigsegg Group AB.

Koenigsegg said when it finalized the takeover that it needed to find around another 3 billion Swedish kronor ($413 million) in financing to satisfy its business plan, and called on the Swedish government to play a key role in raising this money.

Borst said GM is hopeful that deal also can close by the end of the year.

Pontiac, like Saturn, will wind down by next fall.

-By Sharon Terlep; 248-204-5532; sharon.terlep@dowjones.com