Exhibit 99.1

For Release: Monday, Oct. 3, 2011, 10 a.m. EDT

GM’s U.S. Sales Up 20 Percent in September

Higher sales at all four brands deliver eighth monthly share increase of 2011

DETROIT – General Motors Co. (NYSE: GM) today reported total sales of 207,145 vehicles in September, a 20-percent increase compared with September 2010.

Retail deliveries were up 19 percent compared with the same month a year ago and accounted for 74 percent of GM sales. Deliveries to fleet customers increased 22 percent.

“For GM, all of the factors that say this is a good time to buy a new vehicle outweigh the bad news that appears to be slowing down the broader economic recovery,” said Don Johnson, vice president, U.S. Sales Operations. “We’re well positioned going forward because we have momentum and another wave of fuel-efficient passenger cars launching over the next several months at Chevrolet, Buick and Cadillac.”

In September, year-over-year passenger car sales increased 12 percent, crossover sales increased 7 percent and truck sales, which include full-size pickups and SUVs, increased 34 percent.

Month-end dealer inventory in the United States was 558,157 units. GM’s full-size truck inventory was 208,650 full-size pickup trucks, which equates to an 88-days supply. GM is on track to meet its target of ending 2011 with a full-size pickup inventory of about 200,000 units.

GM continues to expect that the full-year U.S. vehicle sales will be in the low end of our 13.0 million – 13.5 million unit range, given seasonally strong sales and the fact that some of the company’s domestic and Japanese competitors have largely resolved their production issues.

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About General Motors – General Motors (NYSE: GM, TSX: GMM), one of the world’s largest automakers, traces its roots back to 1908. With its global headquarters in Detroit, GM employs 208,000 people in every major region of the world and does business in more than 120 countries. GM and its strategic partners produce cars and trucks in 30 countries, and sell and service these vehicles through the following brands: Baojun, Buick, Cadillac, Chevrolet, GMC, Daewoo, Holden, Isuzu, Jiefang, Opel, Vauxhall, and Wuling. The global Chevrolet brand is celebrating its 100^th anniversary in 2011. GM’s largest national market is China, followed by the United States, Brazil, the United Kingdom, Germany, Canada, and Italy. GM’s OnStar subsidiary is the industry leader in vehicle safety, security and information services. More information on the new General Motors can be found at www.gm.com.

CONTACT:

Jim Cain

GM Communications

Cell: 313-407-2843

james.cain@gm.com

Forward-Looking Statements

In this press release and in related comments by our management, our use of the words “expect,” “anticipate,” “possible,” “potential,” “target,” “believe,” “commit,” “intend,” “continue,” “may,” “would,” “could,” “should,” “project,” “projected,” “positioned” or similar expressions is intended to identify forward-looking statements that represent our current judgment about possible future events. We believe these judgments are reasonable, but these statements are not guarantees of any events or financial results, and our actual results may differ materially due to a variety of important factors. Among other items, such factors might include: our ability to realize production efficiencies and to achieve reductions in costs as a result of our restructuring initiatives and labor modifications; our ability to maintain quality control over our vehicles and avoid material vehicle recalls; our ability to maintain adequate liquidity and financing sources and an appropriate level of debt, including as required to fund our planned significant investment in new technology; the ability of our suppliers to timely deliver parts, components and systems; our ability to realize successful vehicle applications of new technology; and our ability to continue to attract new customers, particularly for our new products. GM’s most recent annual report on Form 10-K and quarterly reports on Form 10-Q provides information about these and other factors, which we may revise or supplement in future reports to the SEC.

GM U.S. Deliveries for September 2011 - Divisional Brand Level

GM U.S. Deliveries for September 2011 by Model