This page lists 36 belt drive parts for the 2021 GMC Acadia, across 4 part types, covering all 3 engine options (2.0L L4 Turbocharged, 2.5L L4 and 3.6L V6). Every part shows its brand, manufacturer part number and fitment notes.
The belt drive system on the 2021 GMC Acadia spins the accessories — serpentine and V-belts, tensioners, idlers and pulleys. The largest groups are Belt (20 parts), Belt Tensioner (14 parts) and Belt Tensioner Bolt (1 part). The other 1 part type covers the remaining 1 part.
The 2021 GMC Acadia was sold with 3 engines. 1 part fits every engine; the other 35 are engine-specific. Each part shows which engine(s) it fits.
The most listed brands for 2021 GMC Acadia belt drive parts are DAYCO (6 parts), GATES (6 parts) and CONTINENTAL (5 parts), plus 7 more brands. Quality grades include Standard Replacement and Economy.
9 parts on this 2021 GMC Acadia page carry a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — including DAYCO 5050420DR (Belt) and CONTINENTAL 49851 (Belt Tensioner). Click any part number to see every vehicle that part fits.
Belt
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DAYCO Popular Fits: 2.0L L4 Turbocharged | 5050420DR | 🇺🇸 US 🇨🇦 CA | Drive Rite®Serpentine | View on Amazon |
| CONTINENTAL Fits: 2.0L L4 Turbocharged, 2.5L L4 | 420K5MK | 🇺🇸 US 🇨🇦 CA | Mileage MakerSerpentine | View on Amazon |
| CONTINENTAL Fits: 3.6L V6 | 725K6MK | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Mileage MakerMulti V-Belt | View on Amazon |
| DAYCO Fits: 3.6L V6 | 5060725DR | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Drive Rite®Serpentine | View on Amazon |
| FVP Fits: 2.0L L4 Turbocharged, 2.5L L4 | 420K5 | 🇺🇸 US 🇨🇦 CA | Multi V-BeltSerpentine | View on Amazon |
| FVP Fits: 3.6L V6 | 725K6 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Multi V-BeltSerpentine | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ACDELCO Popular Fits: 2.5L L4 | 12664598 | 🇺🇸 US 🇨🇦 CA | GM Original EquipmentSerpentine | View on Amazon |
| ACDELCO Popular Fits: 2.5L L4 | 5K689 | 🇺🇸 US 🇨🇦 CA | Professional / GoldSerpentine | View on Amazon |
| ACDELCO Popular Fits: 3.6L V6 | 12649097 | 🇺🇸 US 🇨🇦 CA | GM Original EquipmentSerpentine | View on Amazon |
| BANDO Popular Fits: 3.6L V6 | 6PK1840 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Rib Quantity: 6 | View on Amazon |
| DAYCO Popular Fits: 2.0L L4 Turbocharged | 5050420 | 🇺🇸 US 🇨🇦 CA | Serpentine | View on Amazon |
| ACDELCO Fits: 2.0L L4 Turbocharged | 12732747 | 🇺🇸 US 🇨🇦 CA | GM Original EquipmentSerpentine | View on Amazon |
| ACDELCO Fits: 3.6L V6 | 6K724 | 🇺🇸 US 🇨🇦 CA | Professional / GoldSerpentine | View on Amazon |
| BANDO Fits: 2.5L L4 | 5PK1750 | 🇺🇸 US 🇨🇦 CA | Rib Quantity: 5Effective Length: 1750.0 mm | View on Amazon |
| CONTINENTAL Fits: 3.6L V6 | 4060725 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Multi V-BeltSerpentine | View on Amazon |
| DAYCO Fits: 2.5L L4 | 5050689 | 🇺🇸 US 🇨🇦 CA | Serpentine | View on Amazon |
| DAYCO Fits: 3.6L V6 | 5060725 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Serpentine | View on Amazon |
| GATES Fits: 2.0L L4 Turbocharged | K050419 | 🇺🇸 US 🇨🇦 CA | Micro-V | View on Amazon |
| GATES Fits: 2.5L L4 | K050689 | 🇺🇸 US 🇨🇦 CA | Micro-V | View on Amazon |
| GATES Fits: 3.6L V6 | K060724 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Micro-V | View on Amazon |
This table covers the serpentine and accessory belts that drive the front accessories. Typical signs include squeal on cold start, cracks across the ribs, or glazing on the back of the belt. A new belt on a worn tensioner will squeal within weeks — spin the idlers by hand while the belt is off.
20 Belt parts are listed for the 2021 GMC Acadia, from DAYCO, ACDELCO, CONTINENTAL and 3 other brands. DAYCO 5050420DR carries the "Popular" badge.
In the Economy grade, DAYCO, CONTINENTAL and FVP supply 6 parts: the catalog's value-priced group. A representative part number is DAYCO 5050420DR.
The Standard Replacement section lists 14 options from ACDELCO, DAYCO, GATES and 2 other brands — built to original-equipment specification. ACDELCO 12664598 is listed in this group.
Belt Tensioner
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CLOYES Fits: 3.6L V6 | B20557 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| VAICO Fits: 2.0L L4 Turbocharged | V570132 | 🇺🇸 US 🇨🇦 CA | SLE Model or SLT Model | View on Amazon |
| VAICO Fits: 2.5L L4 | V510460 | 🇺🇸 US 🇨🇦 CA | V-Ribbed | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CONTINENTAL Popular Fits: 2.5L L4 | 49851 | 🇺🇸 US 🇨🇦 CA | Multi-V | View on Amazon |
| GM GENUINE Popular Fits: 2.5L L4 | 12627119 | 🇺🇸 US 🇨🇦 CA | FWDTrans.Code 9T50 | View on Amazon |
| GM GENUINE Popular Fits: 3.6L V6 | 12647765 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| CONTINENTAL Fits: 3.6L V6 | 50515 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| DAYCO Fits: 2.5L L4 | 89703 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| GATES Fits: 2.0L L4 Turbocharged | 39693 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| GATES Fits: 2.5L L4 | 39350 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| GATES Fits: 3.6L V6 | 39516 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| GM GENUINE Fits: 2.0L L4 Turbocharged | 55516895 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| LITENS Fits: 2.5L L4 | 999847A | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| LITENS Fits: 3.6L V6 | 999667A | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
This table covers the automatic tensioners that hold belt tension. Typical signs include belt flutter, a chirp that returns after a new belt, or a damper that no longer holds the arm. Replace the tensioner with the belt at higher mileage; the labor overlaps almost entirely.
14 Belt Tensioner parts for the 2021 GMC Acadia come from 7 brands — GM GENUINE, GATES, VAICO and 4 other brands. The "Popular" part is CONTINENTAL 49851.
The Economy section: 3 options from VAICO and CLOYES. CLOYES B20557 is listed in this group.
Standard Replacement: 11 parts, from GM GENUINE, GATES, CONTINENTAL and 2 other brands. A representative part number is CONTINENTAL 49851.
Belt Tensioner Bolt
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: all 2021 Acadia engines | 11588749 | 🇺🇸 US 🇨🇦 CA | Denali or SLE ModelM10X1.5X85 | View on Amazon |
This table covers the Belt Tensioner bolts.
One part is listed for the 2021 GMC Acadia — GM GENUINE 11588749.
Idler Pulley
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: 3.6L V6 | 1540569 | 🇺🇸 US 🇨🇦 CA | Smooth | View on Amazon |
This table covers the idler pulleys the belt wraps around. Typical signs include a chirp that follows engine speed, or a pulley that feels rough or has play. Replace a noisy idler with the belt — the labor is already paid for.
One part is listed for the 2021 GMC Acadia — GM GENUINE 1540569.
Buying Belt Drive Parts for a 2021 GMC Acadia
On this vehicle, the belt drive system spins the accessories — serpentine and V-belts, tensioners, idlers and pulleys.
- Match the engine first. Some belt drive parts fit every engine; others are engine-specific. Each row shows which engine(s) it fits.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, replace the tensioner and idler pulleys with any belt at higher mileage — the labor overlaps almost entirely.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Belt and Belt Tensioner .
Frequently Asked Questions
How many belt drive parts fit the 2021 GMC Acadia?
Our catalog currently lists 36 belt drive parts for the 2021 GMC Acadia across 4 subcategories and 10 brands, covering all 3 engine options (2.0L L4 Turbocharged, 2.5L L4 and 3.6L V6). Each part is matched to the engine(s) it fits.
Do belt drive parts differ between 2021 GMC Acadia engines?
Some do. 1 part fits every engine; the other 35 are engine-specific. Each row (and the filter at the top) shows which. If you're unsure which engine you have, check the emissions label under the hood or the 8th character of your VIN.
What are the signs of belt drive problems on a 2021 GMC Acadia?
Common symptoms include squealing on cold start, a belt that shows cracking or glazing, or an accessory that slows under load. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.
What should I replace at the same time?
Where labor overlaps, replace the tensioner and idler pulleys with any belt at higher mileage — the labor overlaps almost entirely.
What do the market flags (US, CA, MX) on each part mean?
They show the market for which the manufacturer published application data for that part — where the vehicle was first sold, not where the part was made. If your 2021 GMC Acadia was originally sold in the US, the safest choice is a part marked for the US market.
How do I make sure a part fits my 2021 GMC Acadia?
First match the engine — each row shows which engine(s) the part fits. Then a new belt on a worn tensioner will squeal within weeks — check tensioner damping and idler bearings while the belt is off. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2021 GMC Acadia
Belt Drive Parts for Other GMC Acadia Years
Switch vehicle or jump to a subcategory
Manufacturer names, model designations and part numbers are used for identification and fitment reference only. AutoFactsDB is an independent catalog and is not affiliated with, endorsed by, or sponsored by any vehicle manufacturer displayed on this page.