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The 2003 Sierra 2500 is a 2- or 4-door, up to 6-passenger full size pickup, available in 5 trims, ranging from the Work Truck Regular Cab 2WD to the SLE Extended Cab 4WD. The 2003 Sierra 2500's closest competitors include the Chevrolet Avalanche, the Dodge Ram 2500 Regular Cab 4X4, and the Ford F-250 SD SuperCab 4x4.
Upon introduction, both trims are equipped with a standard 6.0-liter, V8, 300-horsepower engine. A 5-speed manual transmission with overdrive is standard on the Work Truck Regular Cab 2WD, and a 4-speed automatic transmission with overdrive is optional. A 4-speed automatic transmission with overdrive is standard on the SLE Extended Cab 4WD.
The 2003 Sierra 2500 is freshened for 2003.