Used 2003 GMC Sierra 2500HD Extended Cab Consumer Reviews
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Power Plus
jamminjay, 07/17/2003
2003 GMC Sierra 2500HD 4dr Extended Cab SLE 4WD LB (6.0L 8cyl 4A)
6 of 7 people found this review helpful
2003 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.
Been driving this truck since new
T, 09/20/2021
2003 GMC Sierra 2500HD 4dr Extended Cab SLE Rwd LB (6.0L 8cyl 4A)
2 of 2 people found this review helpful
Bought the extended cab gas 6.0l engine with the 480LE transmission combo in 2003. Currently has 250k+, and other than a tranny rebuild at 150k and normal maintenance issues, this thing is a champ. Keep up with fluid changes, no problems. Has towing and carrying cap, no problems and it rides better loaded out with 1500 poinds. HEAVY undercarriage construction. Still running smooth and still with original plugs
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2003 GMC Sierra 2500HD for sale near you
Showing 3 of 23 listings
- SLE Diesel Extended CabMSRP: $10,995226 mi away
- Base Diesel Regular CabMSRP: $13,999278 mi away
- SLE Diesel Extended CabMSRP: $5,987516 mi away
See all 23 listings
Excellent Duramax Diesel!
Dave Hardin, 03/07/2003
2003 GMC Sierra 2500HD 4dr Extended Cab SLE 4WD LB (6.0L 8cyl 4A)
4 of 6 people found this review helpful
Don't 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!
Duramax and Allison are superior
Jim T, 10/29/2009
2003 GMC Sierra 2500HD 4dr Extended Cab SLE 4WD SB (6.0L 8cyl 4A)
1 of 1 people found this review helpful
I have owned this truck since new in 2003. Only in the last several years have I used it to its full potential. I have pulled a 10,000 lb fifth wheel to Florida twice and a new 12,000 lb fifth wheel to GA last week and I averaged a little over 13 mpg. On the return trip I got over 24 mpg running at 70 mph all day. I do have a tonneau cover for the bed which might help. I first took this new truck to Ohio in 2003 and only got 22 mpg with the same configuration. I did add a K and N air induction system before my last trip but this truck pulls like a champ without any additonal brains or Banks kits. The 5 speed transmssion is smooth and I know improvements have been made in the 09's.
Not Impressed
cynical13, 11/27/2004
2003 GMC Sierra 2500HD 4dr Extended Cab Rwd SB (6.0L 8cyl 4A)
1 of 1 people found this review helpful
I 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 can't 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!
Good, bad, and ugly
Ted Sparling, 02/25/2005
2003 GMC Sierra 2500HD 4dr Extended Cab SLE 4WD SB (6.0L 8cyl 4A)
1 of 1 people found this review helpful
The Isuzu engine is the best part of this truck, along with the Allison tranny. The worst part has been all the GM stuff. Everything from numerous AC problems to leaks, memory features deleting themselves, multiple transfer case problems for auto 4WD, and leaking fuel injectors. If it were not for the dealership's attitude and incompetance i would buy again.
Nice for towing
john gentry, 08/22/2005
2003 GMC Sierra 2500HD 4dr Extended Cab SLE Rwd SB (6.0L 8cyl 4A)
1 of 2 people found this review helpful
This truck was bought for towing and does a great job pulling our fifth wheel camper.
dura-maxed
workhorse, 09/19/2003
2003 GMC Sierra 2500HD 4dr Extended Cab SLE 4WD SB (6.0L 8cyl 4A)
0 of 0 people found this review helpful
I have owned my gmc for a short while and am very pleased with the Duramax/Allison combination,I have owned powerstrokes in the past,the difference is amazing, the Duramax power range extends for a much longer time, torque is great.Allison transmission holds gear going down steep grades and the mileage for a full size pickup is awesome (average is 18 mpg, I have gotten as high as 21 mpg)
What A Truck - Diesel/Allison Combo
Happy GMC Owner, 10/20/2003
2003 GMC Sierra 2500HD 4dr Extended Cab SLE 4WD SB (6.0L 8cyl 4A)
0 of 0 people found this review helpful
Bought this last May, love the Duramax/Allison Combo - pulls my 10000 pound 5th wheel like it wasn't there. 12 MPG @ 65 MPH - nooo problem. Very stable on the road.
Solid Workhorse 6.6 Duramax
RPCarter, 02/11/2018
2003 GMC Sierra 2500HD 4dr Extended Cab 4WD LB (6.0L 8cyl 4A)
0 of 0 people found this review helpful
Great engine and transmission combo. Duramax / Allison ran well for most of the 10 years I owned the truck. Was used as a work truck with a contractors body fitted. Weekends was used to haul a 3 horse trailer. It worked every day of it's life with me. Poor build quality was evident in the front hubs, bodywork (rusted cab corners and rocker panels, roof flexing with windows open) and cab interior (gauges gave up, blower motor repeatedly died, gauge cluster lights died one by one, headliner fell off). Diesels are expensive to maintain when things go wrong, in my neighborhood it is hard to find a reputable diesel mechanic. Normal maintenance (oil change etc.) is probably more expensive but less frequent. All in all a very reliable truck that felt more like a car to drive.
- Safety
- Technology
- Performance
- Interior
- Comfort
- Reliability
- Value
Too Much
JailDoc, 02/23/2003
2003 GMC Sierra 2500HD 4dr Extended Cab SLE 4WD SB (6.0L 8cyl 4A)
0 of 1 people found this review helpful
The 8.1L, Allison Trans, this vehicle is beyond awesome, lousy milage but that is what was expected. Pull or tow anything, fast as hell, acceleration is neck snaping, stable anywhere you take it. So far no problems like my last GMC (ABS pump went out), the dealer is lousy, can't trust a thing they say. Time will tell.
??
Ralph gallo, 07/20/2003
2003 GMC Sierra 2500HD 4dr Extended Cab SLE 4WD SB (6.0L 8cyl 4A)
0 of 1 people found this review helpful
this is great truck ! no question about it .
Bob's GMC
RBob, 08/18/2004
2003 GMC Sierra 2500HD 4dr Extended Cab SLE 4WD LB (6.0L 8cyl 4A)
0 of 1 people found this review helpful
Drove 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.