The 2009 GMC Sierra 2500HD is part of the vehicle's second generation. It's a heavy-duty pickup that's available with either a 6.0-liter V8 engine producing 353 horsepower or a 6.6-liter turbo-diesel V8 outputting a hefty 365 horsepower and 660 lb-ft of torque. Both engines pair with a six-speed automatic transmission. There are three trims: Work Truck, SLE, and SLT, with standard rear-wheel drive; four-wheel drive is optional. Key features include available OnStar telecommunication service, satellite radio, and optional features like a navigation system and a rear-seat entertainment system. Notable for its payload and towing capacities, the 2009 Sierra 2500HD remains a solid option in the heavy-duty segment.