Mile ratingNo known defect pattern for this model year
The 2021 GMC Sierra 2500HD is not on our list of model years with a widely reported mechanical or electrical problem. That is a point in its favour, not a clean bill of health — this car's own history still matters, so check the VIN report and get it inspected.
What owners of the 2021 Sierra 2500HD say
Owner reviews for this exact model year are the fastest way to find out what breaks, what it costs to fix and whether the car lives up to the spec sheet.
Partner links — Caboose may earn a commission if you buy through them, at no cost to you. It never affects which cars we list.
About this car
The GMC Sierra 2500HD is No. 17 on the Caboose longevity table: 17.2% of them reach 250,000 miles, against 5.4% of all vehicles. This 2021 GMC Sierra 2500HD Denali Crew Cab 4WD is listed at $47,275, about $2,632 below the CarGurus expected market price of $49,907. It has 116,941 miles and comes in Black. Power comes from a 6.6L V8 Biodiesel with four-wheel drive. It is offered by Bell & Bell GMC in Little River, SC (franchise dealer).
Why it's a good buy
- 17.2% of GMC Sierra 2500HDs reach 250,000 miles — No. 17 of 52 on the Caboose table
- 83,059 miles of runway before 200,000
- 5% below market price ($2,632 savings)
- No widely reported defect pattern for this model year
- Leather Seats
- Sunroof/Moonroof
Features
Caboose PRO
The full 789-word analysis of this car
The verdict
The 2021 GMC Sierra 2500HD Denali Crew Cab 4WD is listed at $47,275 with 116,941 miles. The Caboose score is 7.7 out of 10, built from three things: how far below market the price sits, how much of the 200,000-mile target is still ahead of the odometer, and how often this model reaches 250,000 miles in the iSeeCars study (17.2% of GMC Sierra 2500HDs do).
The asking price is $2,632 (5.3%) under the CarGurus expected price of $49,907, which is a real discount rather than a rounding gap. That puts it in the middle of the pack, so treat it as a candidate to compare rather than a car to rush.
- Price against the market
- Mileage runway to 200,000
- Odds of reaching 250,000 miles
- Ownership budget (planning estimates)
- What to inspect on this exact car
- Questions for Bell & Bell GMC
- Your next seven days
Get it road-ready
The usual first-week purchases for a 2021 GMC Sierra 2500HD, from partners we trust.
Partner links — Caboose may earn a commission if you buy through them, at no cost to you. It never affects which cars we list.
Similar great deals
Mile rating
Mile rating
Mile rating
Mile rating
Mile rating