GENERAL Motors Corp, aiming to boost sagging sales, rolled out a major promotion for United States dealers on Monday that includes employee-level discounts on almost all the Chevrolet cars and trucks in its showrooms.

The discount offer takes effect today and marks GM's return to a strategy it had abandoned in the last two years in an effort to make its pricing more transparent and to wean American consumers from fire-sale blowout deals.

But the downturn in US auto sales has hit GM hard. Sales through July were down almost 18 percent and the auto maker has faced pressure to cut costs amid signs that industrywide sales would remain slack in August despite lower gasoline prices.

"Desperate times call for desperate measures, and that's what we're seeing from GM," said Jesse Toprak, an analyst who tracks incentives for automotive Website Edmunds.

Earlier, auto dealers briefed on the promotion had told Reuters about the new incentive plan. GM spokesman John McDonald confirmed the auto maker would offer the employee pricing and said more details were to be revealed yesterday.

GM will offer employee discounts on all 2008 model-year Chevrolets in addition to cash-back offers on slower-selling models such as the Chevrolet Silverado pickup truck, according to a dealer briefed by GM on the plan.

The offer also will include employee pricing on some 2009 model-year vehicles, including the Cobalt sedan and HHR compact wagon, two of the more fuel-efficient Chevy models, according to the dealer, who was not authorized to discuss the plan.

GM shares closed down 7.3 percent on Monday, hitting their low for the day just after the incentive announcement.

GM briefed dealers for all of its US brands - including Cadillac, Saab, Buick, GMC and Saturn - on the new discount offer on Monday.

The top-selling US auto maker, which has faced pressure to cut costs and shore up its cash position in the face of the sharp US sales downturn, has had some success with targeted incentive programs in recent months.

Buyers for the Chevy Silverado will get US$5,000 back in addition to the US$3,000 employee discount, while incentives total US$10,000 for the Chevy Tahoe SUV.