DETROIT — General Motors extended its employee-discount-pricing program on Wednesday to last through the end of September — but buyers of the 2009 Chevrolet Corvette are still shut out. However, the program, which was launched in late August, has been expanded to include many 2009 model-year vehicles, including all Chevrolet Silverado and pickups, the automaker said in a statement.GM said its 2009 model-year vehicles eligible for employee pricing starting September 3 include the Chevrolet Avalanche, Cobalt, Equinox, HHR, Impala, Malibu and Silverado. Other '09 models included in the discount program: the Buick Enclave and the Pontiac G5, G6, G8 Solstice, Torrent and Vibe. The 2009 GMC Acadia and all 2009 models of the GMC Sierra are included. Eligible 2009 Saturn vehicles are the Aura, Outlook and Sky, while '09 Cadillac vehicles include the CTS, DTS, SRX and STS. 2009 Hummer vehicles in the program include the H2 and H3. 'Hybrid models of listed vehicles are included in the sale,' said General Motors.GM noted that the event features employee pricing on 'nearly all 2008 vehicles.' The program is designed to help the beleaguered automaker clear out inventory and boost faltering sales.What this means to you: You have almost an entire month to take advantage of GM's employee pricing offer. — Anita Lienert, Correspondent