GM's Summerdrive marketing initiative deals are expected to be matched by Ford Motor Co. and other automakers. Summerdrive incentives are available on 2004 vehicles delivered from July 7 through Aug. 2.
GM also is offering interest-free financing for five years to qualified buyers of 2004 model vehicles to reduce inventories. GM sales fell 12 percent in June; Ford sales were down 8 percent.
GM had a 90-day supply of unsold vehicles. Ford had an 87-day supply, the Detroit Free Press said.
"As we head into the summer selling period, our Summerdrive and Owner Loyalty programs make it a great time to purchase a new GM car or truck," said John Smith, vice president of GM North American Vehicle Sales, Service and Marketing.
The Cadillac CTS-V and XLR, Chevrolet SSR and Hummer H2 are not part of the new incentive program.