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 1 through 10 of 26.00-
Bobs GMC - 2003 GMC Sierra 2500HD
By RBob - November 5 - 10:00 amDrove this GMC across the country, many mountain roads and off highway. One of the most fun vehicles I have driven and I absolutely love the Turbodiesel and Allison transmission combination. I have had zero problems with this truck, you would think it was made in Japan for the quality.
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EXHAUSTED - 2003 GMC Sierra 2500HD
By Frustrated Rancher - July 23 - 10:00 amDisappointed in the power. Tried to pull a 16 stock trailer with two bulls. It was all it could do to get over a small hill. Constant air conditioning problems. Unscrupulous dealership tells me it has been repaired. Lies. Electric window problems. Needs larger fuel tanks for a truck that gets 13mph. Wears front tires knobby. Stress cracks in the windshield. Brakes squeel. Tapping in the engine. Would I buy again. No Chance. Off to the dealership for engine noise;AC repairs again. Watch out Ford/Dodge, here I come.
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Still smiling... - 2003 GMC Sierra 2500HD
By brian0105 - June 11 - 10:00 amI researched long and hard when deciding on the $$ for the Duramax/Allison combo. Man am I pleased! It pulls my travel trailer like it wasnt even there. MPG has been better than my previous Firebird. Comfort is much better than I expected for a 3/4 ton. Looks? Man, you cant beat the Fire Red color! Dont know what it might take to wipe this smile off my face!
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GMC CrewCab 4WD SLT with 8.1L /Allison - 2003 GMC Sierra 2500HD
By Gilbert L. - March 22 - 10:00 am600 miles and drive-by-wire trottle body left me stranded. Immediately after the dealership replaced with new trottle body, the 4WD Transfer Case Control Module misteriuosly went bad (RE: Service Bullitin Rel. 02/2003). Very poor Service Dept. at dealership. I had very bad experience with unscrupulous mechanic who falsely claimed work that was not performed. Suspension springs incorrectly installed by manufacturer.
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Excellent Duramax Diesel! - 2003 GMC Sierra 2500HD
By Dave Hardin - November 14 - 2:00 amDont want to spend to much time here, but if your thinking about buying this vehicle w/ this motor, all I would say is "do it". It awesome!
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GMC 1500 HD - 2003 GMC Sierra 2500HD
By USA DAD - October 14 - 10:00 amMy truck gets about 15 miles per gallon, which is better than I thought it would. It pulls hay like it wasnt back there.
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Fuel Economy - 2003 GMC Sierra 2500HD
By Chevy Man - August 19 - 1:53 pmIve had my 2500HD for just under a year now and I LOVE it. The only problem I really have is its fuel economy. I average around 14 mpg, but where it lacks fuel economy it makes up for it in power. I haul around a skidsteer on a 14 ft open trailer. The skidsteer weighs more then my truck but still no problems pulling it. The fuel economy doesnt really change weather your hauling or not. I just purchased an SLR performance chip that should do the trick. This truck is perfect for anyone with the money to pay for gas.
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lemon - 2003 GMC Sierra 2500HD
By darlene - July 4 - 10:00 amWe have a 2003 gmc thats been a nightmare.the horn keeps blowing fuses,wont start in park,no reverse fuel light doesnt work plus the gas gage stuck on and the thin plastic bottom part of the bumper crack. Trying to get the dealer and gm to take this truck back hasnt been fun. Anyone looking to buy a new truck be careful,when you pay 45000.00 for a new truck you dont expect this.
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?? - 2003 GMC Sierra 2500HD
By Ralph gallo - May 17 - 10:00 amthis is great truck ! no question about it .
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Not Impressed - 2003 GMC Sierra 2500HD
By cynical13 - April 11 - 10:33 amI bought this truck as a replacement for my 96 1500 as I needed more muscle to tow a 5th wheel trailer. The 8.1L has plenty of punch, but I struggled with traction on anything less than dry hard surfaces. I have already experienced the typical Chevy/GMC parking light burn out on one side that they cant seem to fix and I have had numerous fuel indicator malfunctions. The fuel consumption is killing me and towing or not is not much difference. Ready to look for an older/smaller model again!
