GM says the promotion will run from Aug. 20 through Sept. 2.
Employee discounts generally are 10 percent below the invoice price but vary by model. GM in the past has used incentives across most of its model lineup to clear out inventory to make way for new models.
The 2009 models will make their way to showrooms in late summer and early fall.
GM shares fell 31 cents, or 3 percent, to $10.05 in morning trading.
