Recommended Maintenance & Wear Parts for a 2021 GMC Sierra
The common service parts a 2021 GMC Sierra needs — typical replacement intervals, what to watch for, and where to buy each one. Confirm exact fitment by VIN before purchasing.
GMC’s maintenance schedule for the 2021 GMC Sierra lists the engine air filter every 45,000 mi, cabin air filter every 22,500 mi, spark plugs every 60,000 mi, serpentine belt every 150,000 mi and fuel filter every 30,000 mi. The other 10 parts below have no interval in that schedule and are replaced on condition; the ranges shown for them are general guidelines for all cars. TecDoc part numbers are on file for 2 of the 15 parts on the 6.2 L petrol/ethanol, 8-cyl, 409 hp engine. NHTSA also lists 7 safety recalls for this model, most often for the power train (2) and seat belts (2).
Last updated: · Specs: NHTSA vPIC · Recalls: NHTSA
2021 GMC Sierra maintenance & wear parts
Intervals marked OEM are manufacturer-recommended for this vehicle; the rest are typical guidelines. Your real schedule still varies by engine, trim and driving conditions — Always follow your owner's manual and confirm the exact part by VIN before buying.
| Part | System | Interval | Common signs | Part no. (TecDoc) | Shop |
|---|---|---|---|---|---|
| Brake Pads | Brakes | General: Every 40,000–70,000 km | Squeal, grinding, longer stops | P09015N BREMBO | Shop → |
| Brake Rotors | Brakes | General: With pads / if warped | Pedal pulsation, deep scoring | — | Shop → |
| Oil Filter | Engine | General: Every oil change (8,000–16,000 km) | Replaced with the oil | — | Shop → |
| Engine Air Filter | Engine | Every 45,000 mi OEM | Low MPG, weak acceleration | — | Shop → |
| Cabin Air Filter | HVAC | Every 22,500 mi OEM | Weak airflow, musty smell | — | Shop → |
| Spark Plugs | Ignition | Every 60,000 mi OEM | Rough idle, misfires | CCH9405 CHAMPION | Shop → |
| 12V Battery | Electrical | General: Every 3–5 years | Slow crank, dim lights | — | Shop → |
| Alternator | Electrical | General: As needed (no fixed interval) | Battery light, dimming lights | — | Shop → |
| Starter Motor | Electrical | General: As needed (no fixed interval) | Click on start, no-crank | — | Shop → |
| Wiper Blades | Exterior | General: Every 6–12 months | Streaking, chattering | — | Shop → |
| Headlight Bulbs | Lighting | General: As needed (when dim or out) | One side dim or burnt out | — | Shop → |
| Serpentine Belt | Engine | Every 150,000 mi OEM | Squeal on cold start, cracks | — | Shop → |
| Fuel Filter | Fuel System | Every 30,000 mi OEM | Hard start, hesitation | — | Shop → |
| Radiator | Cooling | General: As needed (leaks / overheating) | Overheating, coolant leak | — | Shop → |
| Water Pump | Cooling | General: Often done with the timing belt | Coolant leak, whine, overheat | — | Shop → |
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. Linear dimensions in mm; weight in kg. Your exact build may vary by trim — decode your VIN to confirm.
Open recalls on the 2021 GMC Sierra (7)
The NHTSA database lists 7 safety recalls for the 2021 GMC Sierra, affecting: SEAT BELTS, TIRES, POWER TRAIN, ENGINE AND ENGINE COOLING. A recall repair is free at a franchised dealer. Check whether yours is affected by your exact VIN.
| Component | Summary |
|---|---|
| SEAT BELTS | General Motors, LLC (GM) is recalling certain 2019-2021 Chevrolet Silverado 1500 and GMC Sierra 1500, 2021 Chevrolet Suburban and Tahoe and GMC Yukon XL and 2020-2021 Chevrolet Sil… |
| SEAT BELTS | General Motors, LLC (GM) is recalling certain 2020 Chevrolet Bolt EV and 2021 GMC Canyon and Sierra 1500, 2500 and 3500, Yukon, Yukon XL, Cadillac Escalade and Escalade ESV and Che… |
| TIRES | General Motors LLC (GM) is recalling certain 2020 Buick Enclave, Cadillac XT5, GMC Acadia and Chevrolet Traverse vehicles and 2020-2021 Chevrolet Silverado 1500, GMC Sierra 1500 ve… |
| TIRES · TEMPORARY/EMERGENCY SPARE TIRE | General Motors (GM) is recalling certain 2019-2021 GMC Sierra 1500 and Silverado 1500 vehicles equipped with certain accessory road tires and a 17" spare tire. The 17" spare tire … |
| POWER TRAIN · AUTOMATIC TRANSMISSION | General Motors, LLC (GM) is recalling certain 2020-2022 Chevrolet Silverado 1500, 2500, 3500, GMC Sierra 1500, 2500, 3500, 2021 Cadillac Escalade, Escalade ESV, Chevrolet Tahoe, Su… |
| ENGINE AND ENGINE COOLING · ENGINE | General Motors LLC (GM) is recalling certain 2021-2024 Cadillac Escalade and Escalade ESV, Chevrolet Silverado 1500, Suburban, and Tahoe, GMC Sierra 1500, Yukon, and Yukon XL vehic… |
See all recalls for the 2021 GMC Sierra → · Source: NHTSA. Confirm by VIN before assuming a recall applies.
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Decode my VIN →Frequently asked questions
How often should parts be replaced on a 2021 GMC Sierra?
GMC’s maintenance schedule for the 2021 GMC Sierra lists the engine air filter every 45,000 mi, cabin air filter every 22,500 mi, spark plugs every 60,000 mi, serpentine belt every 150,000 mi and fuel filter every 30,000 mi. Parts not in that schedule, such as brake pads, are replaced when inspection shows wear.
What part numbers fit a 2021 GMC Sierra?
For the 6.2 L petrol/ethanol, 8-cyl, 409 hp engine, TecDoc lists brake pads BREMBO P09015N and spark plugs CHAMPION CCH9405, among others; 2 of the 15 parts in the table have a catalogued number. Other engines of the same model year can need different parts.
What maintenance parts does a 2021 GMC Sierra need?
The recurring service and wear parts are brake pads and rotors, the engine oil, air and cabin filters, spark plugs, the 12V battery, wiper blades, headlight bulbs and the serpentine belt; the alternator, starter, radiator and water pump are replaced when they fail.
Where can I buy parts for a 2021 GMC Sierra?
Each row links to marketplace listings for that part on this 2021 GMC Sierra. Confirm fit before buying: a VIN lookup resolves the engine and trim that decide which part number is correct.