Overview & Reviews
The Sierra gets a revised look this year that includes a new front fascia, revised side moldings and optional multifunction, fold-away mirrors. On the inside, GMC has added new seats, a more comprehensive driver information center, a redesigned instrument panel and optional dual-zone climate control and satellite steering wheel controls. On the hardware side, the standard 6.0-liter V8 gets electronic throttle control as well as the ability to run exclusively on Compressed Natural Gas (CNG) or a mix of CNG and gasoline. Other upgrades include an improved Insta-Trac part-time four-wheel drive system for reduced service costs, a more efficient starter for the 8.1-liter V8 and a revised headlight switch that allows drivers to turn off the daytime running lamps.
- Powerful drivetrains, roomy interior, numerous available amenities.
- Spotty build quality, cheap interior materials.
User Reviews:
Showing 21 through 26 of 26.00-
Go GMC!! - 2003 GMC Sierra 2500HD
By GeorgeStrait - November 16 - 10:00 amGreat Power and Transmission, Had a Service 4WD Problem recently 5/2003 with 4000 miles on truck. Went into 4WD low w/o input from driver. Part not available, waited 3 weeks and a tow truck ride later!! YES I would buy another.
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Not so happy with my 2500HD - 2003 GMC Sierra 2500HD
By Tim - October 15 - 2:00 amI had a dent on the hood when I purchased the truck. The push button 4 wheel drive went out (defective switch). The passenger side door module went bad (havent got it fixed yet, they cant get the part). The truck has 1300 miles. These trucks arent cheap and so far Im not impressed. GMC needs to clean up there act!
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Truck of the Year - 2003 GMC Sierra 2500HD
By Seth - May 3 - 2:00 pmFuel milage is great, 15-18 mpg.Steering column has presented a few small issues allong with sticky power mirror on the drivers side - replaced once.
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What A Truck - Diesel/Allison Combo - 2003 GMC Sierra 2500HD
By Happy GMC Owner - April 5 - 10:00 amBought this last May, love the Duramax/Allison Combo - pulls my 10000 pound 5th wheel like it wasnt there. 12 MPG @ 65 MPH - nooo problem. Very stable on the road.
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GMC Sierra - 2003 GMC Sierra 2500HD
By myoder - March 1 - 5:03 amBest pickup I have ever owned, plenty of power and is very comfortable
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Power Plus - 2003 GMC Sierra 2500HD
By jamminjay - February 28 - 10:00 am2003 Sierra with 8.1 liter 345 HP and Alison Auto. Plenty of power for towing. A little hestitant on take off when cold. 20,000 miles in 6 months and it runs like day 1. Fuel mileage is absolutely HORRENDOUS!!!! Towing an enclosed race car trailer x-country avg. mileage = 7.95. Driving enmpty no load at all avg. mileage = 12.98.
