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 interiors, numerous available amenities.

• Spotty build quality, cheap interior materials.

User Reviews:

Showing 1 through 4 of 4.00

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  Shoulda kept my FORD - 2003 GMC Sierra 3500
  By Bob Sutliff - February 13 - 2:00 am

  Truck looks great! Fuel mileage (non towing) is not bad for a ton dually at 13 mpg. Towing is another story. Six (6) miles per gallon is the average for this 6.0L engine. Tow mileage is terrible and the truck is at its maximum performance on the interstate at 70mph. It absolutely has no power left.

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  Great Truck - 2003 GMC Sierra 3500
  By tdorsett_1 - December 2 - 2:00 am

  Hauling hay and horses has never been so easy, power to spare, better on fuel mileage that I would have though. Pulling a small 2-horse slant load trailer with two 1200 lb. horses or a twenty-foot trailer loaded with three round bails of hay, I get an average of 18 miles per gallon. Without pulling, I get between 21 and 25 miles per Gallon. (Highway)

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  WHAT CAN YOU SAY....? - 2003 GMC Sierra 3500
  By Big Money - October 21 - 2:00 am

  Extremely Satisfied with Fllet Manager Diane Ford, Ironic working for GM with that Name. Excellent Truck! 230K MILES On the Last One and going for 430k On the Duramax/Allison Combonation.

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  Proffessional truck!!!! - 2003 GMC Sierra 3500
  By truckinisfun - November 30 - 2:00 am

  I love the tramendous performance of my sierra at a ropping 325hp and 370foot lbs. of tourque.I also love the way it steers with my camper hooeked to the back,anyone who likes trucks should deffinetly at least check it out.