2021 GMC Sierra Specs & Parts
Full specifications for the 2021 GMC Sierra — dimensions, weight, and body data from NHTSA — plus how to find parts for your exact car by VIN.
The 2021 GMC Sierra measures 6130 mm long with a 3980 mm wheelbase, 2060 mm wide, and 1920 mm tall, and weighs 2129 kg (NHTSA). NHTSA lists 7 safety recalls for the 2021 GMC Sierra, most often for the power train (2) and seat belts (2); the most recent is campaign 26V083000 (2026-02-12) on the power train. The catalogue lists one engine for the 2021 model year: 6.2 L 409 hp petrol/ethanol. VinSnap holds catalogue part numbers for 2 of 15 common parts on the 6.2 L petrol/ethanol, 8-cyl, 409 hp engine, for example brake pads BREMBO P09015N and spark plugs CHAMPION CCH9405. GMC’s maintenance schedule lists the cabin air filter every 22,500 mi, fuel filter every 30,000 mi and engine air filter every 45,000 mi.
Last updated: · Source: NHTSA vPIC
2021 GMC Sierra at a glance
| NHTSA safety recalls | 7 |
|---|---|
| Latest recall | 26V083000 (2026-02-12), power train |
| Most-recalled systems | power train (2), seat belts (2) and tires (2) |
| Engine variants (parts catalogue) | 6.2 L 409 hp petrol/ethanol |
| Parts with catalogued numbers | 2 of 15 |
| OEM service intervals on file | cabin air filter: every 22,500 mi; fuel filter: every 30,000 mi; engine air filter: every 45,000 mi; spark plugs: every 60,000 mi; serpentine belt: every 150,000 mi |
Sources: NHTSA recalls, aftermarket parts catalogue, manufacturer maintenance schedule.
2021 GMC Sierra specifications
| Specification | Value |
|---|---|
| Make | GMC |
| Model | Sierra |
| Model Year | 2021 |
| Overall Length (mm) | 6130 |
| Overall Width (mm) | 2060 |
| Overall Height (mm) | 1920 |
| Wheelbase (mm) | 3980 |
| Curb Weight (kg) | 2129 |
| Front Bumper to Windshield Base (mm) | 1310 |
| Side Glass Height (mm) | 480 |
| Side Glass Base to Rocker Panel (mm) | 930 |
| Roof Width Between Side Rails (mm) | 1300 |
| Front Overhang (mm) | 950 |
| Rear Overhang (mm) | 1210 |
| Front Track Width (mm) | 1730 |
| Rear Track Width (mm) | 1730 |
| Weight Distribution, Front/Rear (%) | 58/42 |
| Models GMC offered in 2021 | 8 |
Source: NHTSA vPIC / Canadian Vehicle Specifications database. Linear dimensions in mm; weight in kg. Your exact build may vary by trim and options — decode your VIN to confirm.
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Decode my VIN →Frequently asked questions
What are the dimensions of the 2021 GMC Sierra?
The 2021 GMC Sierra measures 6130 mm long, 2060 mm wide, and 1920 mm tall, with a 3980 mm wheelbase and a 2129 kg curb weight, per the NHTSA Canadian Vehicle Specifications database. Trim and body style can change these figures.
Does the 2021 GMC Sierra have any recalls?
Yes. NHTSA lists 7 safety recalls for the 2021 GMC Sierra, most often for the power train (2) and seat belts (2); the most recent is campaign 26V083000 (2026-02-12) on the power train. Recall repairs are free at a franchised GMC dealer, and a VIN check shows which campaigns apply to a specific vehicle.
What engines were available in the 2021 GMC Sierra?
The catalogue lists one engine for the 2021 Sierra: 6.2 L 409 hp petrol/ethanol.
How do I find the right parts for a 2021 GMC Sierra?
Start from the engine, because it decides most fitment. For the 6.2 L petrol/ethanol, 8-cyl, 409 hp engine, the catalogue lists brake pads BREMBO P09015N and spark plugs CHAMPION CCH9405; other engines can need different numbers. A VIN lookup resolves the exact engine and trim.
Where is the VIN on a 2021 GMC Sierra?
The 17-character VIN is on the driver-side dashboard (visible through the windshield at its base), on the sticker in the driver’s door jamb, and on the registration and insurance documents.
Common parts for this 2021 GMC Sierra
Fitment guidance and VIN-based parts search for the 2021 GMC Sierra:
Safety recalls for the 2021 GMC Sierra
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