2021 GMC SIERRA 2500 HD CREW CAB

If you're searching for a capable, work-ready diesel truck at a price that makes sense, this 2021 GMC Sierra 2500 HD Crew Cab SLE for sale at You First Autos in Costa Mesa, California deserves your attention. Priced at $36,999 with a 6.6-liter turbo diesel V8 under the hood and a full 8-foot bed ready for whatever the job demands, this is a truck that earns its keep every single day.

About This 2021 GMC Sierra 2500 HD

This 2021 Sierra 2500 HD comes in as a Crew Cab configuration with a full 8-foot long bed — a combination that serious truck buyers seek out for maximum payload and hauling versatility without sacrificing rear passenger room. At 132,920 miles, this truck has clearly been used the way a heavy-duty diesel is meant to be used. That's not a knock — it's context. The 6.6-liter Duramax diesel engine is engineered for the long haul, with many examples surpassing 300,000 miles when properly maintained. Buyers who understand diesel ownership know that a well-cared-for Duramax at this mileage is often just hitting its stride. Stock #21475100, VIN 1GT49MEY6MF214751.

2021 GMC Sierra 2500 HD Performance and Engine

6.6-Liter Duramax Turbo Diesel Power

The 2021 GMC Sierra 2500 HD's 6.6-liter Duramax turbo diesel V8 produces 445 horsepower and a massive 910 lb-ft of torque in this generation — numbers that translate directly into real-world towing capability rated up to 18,500 pounds when properly equipped. Paired with the heavy-duty 6-speed automatic transmission with overdrive, power delivery is smooth and confident whether you're climbing grades fully loaded or cruising the freeway empty.

4WD Capability for Work and Adventure

Four-wheel drive on a heavy-duty truck isn't a luxury — it's a job requirement for many buyers. This Sierra 2500 HD's 4WD system gives you the traction confidence to haul equipment onto job sites with uneven terrain, tow a trailer in slick conditions, or venture off-pavement when the weekend calls for it. Orange County may be sunshine country, but contractors and outdoor enthusiasts heading toward Big Bear, the San Bernardino Mountains, or worksites throughout the Inland Empire will appreciate having that capability on tap.

GMC Sierra 2500 HD SLE Features and Interior

The SLE trim on the Sierra 2500 HD is GMC's value-packed entry into the heavy-duty lineup — and it includes more than many buyers expect. The Crew Cab body style gives you four full-size doors and a genuinely spacious rear seat, making this a truck that works as hard for your passengers as it does on the jobsite. Standard SLE features typically include a color touchscreen infotainment system, GMC's intuitive interface, Bluetooth and smartphone connectivity, power windows and locks, air conditioning, and a rearview camera. The SLE also includes the tough exterior elements you expect from a work truck — durable bumpers, trailer towing mirrors, and bed lighting to help during those late-afternoon unloads.

GMC Sierra 2500 HD Reliability and Ownership

The Duramax diesel engine family has earned an outstanding reputation among truck owners, fleet managers, and towing enthusiasts across the country. The L5P Duramax found in this generation of Sierra 2500 HD has addressed many of the concerns from earlier generations, with improved reliability, better emissions management, and stronger overall longevity. The Allison-derived 6-speed Hydra-Matic transmission in this configuration is also regarded as one of the most durable automatic gearboxes in the heavy-duty truck segment.

Owners consistently report low maintenance costs relative to the work these trucks handle, especially compared to gas-powered alternatives. Diesel fuel economy on the highway — often in the 17–20 MPG range depending on load and terrain — makes long-distance towing far more economical. If you're shopping a high-mileage diesel and are concerned about condition, a pre-purchase inspection by a qualified diesel technician is always a smart move. You First Autos can help facilitate that peace of mind.

Why Buy From You First Autos in Costa Mesa, California

You First Autos, located in Costa Mesa in Orange County, California, lives up to its name by putting customers at the center of the buying experience. Purchasing a high-mileage heavy-duty truck requires trust, transparency, and a dealer who can answer your questions honestly — and that's exactly the approach the You First Autos team takes. Whether you're a contractor, a weekend warrior, or a buyer who simply wants maximum truck for the dollar, this dealership understands that a well-matched vehicle and a straightforward deal matter more than a high-pressure pitch.

Costa Mesa is centrally located in Orange County, making You First Autos easily accessible to buyers throughout the region who want to skip the big-box dealership experience and work with a team that's genuinely responsive.

Financing a Used GMC Sierra 2500 HD Near Costa Mesa

Heavy-duty trucks at this price point are well within reach of most buyers — and financing a used diesel truck doesn't have to be complicated. You First Autos works with a range of lenders to help buyers in Costa Mesa and throughout Orange County find monthly payment options that work with their budget. Whether your credit is excellent, rebuilding, or somewhere in between, the team can work to match you with competitive financing terms.

Self-employed buyers, contractors, and small business owners may also benefit from business-use vehicle financing options — ask the You First Autos finance team about what might apply to your situation. A pre-approval is quick, and you can often get answers the same day.

Frequently Asked Questions

Is the 2021 GMC Sierra 2500 HD a good buy at 132,920 miles?

Yes — when properly maintained, the 6.6-liter Duramax diesel engine in the 2021 Sierra 2500 HD is built to last well beyond 200,000 to 300,000 miles. High mileage on a diesel truck tells a different story than high mileage on a gas vehicle. At $36,999, this truck offers exceptional capability per dollar for buyers who understand diesel ownership.

How many miles is too many on a Duramax diesel?

There's no universal cutoff — condition, maintenance history, and how the truck was used matter far more than the odometer. Many Duramax-powered trucks remain in active commercial and recreational service well past 250,000 miles. A professional inspection and review of any available service records will give you the clearest picture of where this truck stands.

What does the GMC Sierra 2500 HD SLE trim include?

The SLE trim is the first step into feature-loaded territory on the Sierra 2500 HD lineup. It typically includes a touchscreen infotainment display, rearview camera, Bluetooth, power accessories, air conditioning, trailer tow mirrors, and bed lighting — along with all of the heavy-duty mechanical underpinnings that make the 2500 HD such a capable platform.

How much can a 2021 GMC Sierra 2500 HD tow?

When properly configured, the 2021 Sierra 2500 HD with the 6.6-liter Duramax diesel is rated to tow up to approximately 18,500 pounds — making it fully capable of handling fifth-wheel campers, large enclosed trailers, heavy equipment, and commercial loads.

Is 4WD important on a heavy-duty truck?

For many buyers, yes. Whether you're navigating muddy job sites, towing in wet or icy conditions, or driving mountain roads to reach a campsite or ski area, 4WD provides the traction and confidence a rear-wheel-drive truck simply can't match in those situations.

Serving Costa Mesa and Surrounding Areas

You First Autos is proud to serve drivers throughout Orange County and beyond. Buyers regularly make the trip from nearby communities including Huntington Beach, Newport Beach, Irvine, Santa Ana, Anaheim, Fountain Valley, Garden Grove, and Tustin. Southern California truck buyers from Los Angeles County to the south end of the Inland Empire have discovered that the straightforward, customer-first approach at You First Autos is worth the drive — especially when the truck is this well-priced.

If you're coming from the beach cities or the hills above the county, You First Autos in Costa Mesa is centrally positioned and easy to reach via the 405, the 55, or the 73.

Contact You First Autos Today

Ready to see this 2021 GMC Sierra 2500 HD Crew Cab SLE in person? Give the You First Autos team a call at (714) 329-0861 to confirm availability, ask questions, or schedule a test drive. Come feel what 910 lb-ft of torque feels like from behind the wheel — and let the You First Autos team help you drive home in the truck that's built for whatever you're hauling.