The towing capacity in the 2015 GMC Sierra 1500 ranges from 5,500 – 12,000 lbs. This is dependent on the cab size, bed size, drive, package, and most importantly engine.
The highest towing capacity in the 2015 GMC Sierra 1500 of 12,000 lbs is achieved with the 6.2L V8 Engine 2WD Double Cab Bed with Max Trailering Package, as well as the 2WD Crew Cab Short Box with Max Trailering Package.
You should always use your own data to determine your towing capacity by calculating towing capacity on your own by using the weight capacities listed in your truck door.
Information in this guide was taken from the 2015 GMC Sierra 1500 Owner’s Manual, the 2015 GMC Sierra 1500 Specifications Sheet, 2015 GMC Sierra 1500 Trailering Guide, 2015 GMC Sierra Denali Owner’s Manual and the 2015 GMC Sierra 1500 e-brochure.
Though I tried to make this information as accurate as possible, you should always check your manual or contact your local dealer to determine the appropriate towing capacity of your vehicle and necessary equipment.
2015 GMC Sierra 1500 Engine Performance
There are 3 available engines in the GMC Sierra 1500. Not every trim is available with each engine, but there are definitely a lot of choices.
We will walk you through the specs of each to help you decide what engine you want, or identify what engine you have if you already have your truck.
There is the 4.3 L V8, 5.3 L V8, and 6.2 LV8.
4.3 L V8 Engine
The 4.3 L V8 engine has a torque of 305 lb.-ft. @ 3,900 rpm and 285 hp @ 5,300 rpm.
Depending on the compatibility, this engine has a max towing capacity of 7,600 lbs.
This engine comes with either a 6-speed automatic or 8-speed transmission which impacts the towing and payload capacities slightly.
5.3 L V8 Engine
The 5.3 L V8 engine in the 2015 GMC Sierra 1500 provides 355 hp @ 5,600 and 383 lb-ft of torque @ 4,100.
This engine is a 6 speed automatic engine that is also available in an 8-speed option.
This engine comes standard on the SLT and Denali.
6.2 L V8 Engine
The 6.2 L V8 engine in the 2015 GMC Sierra 1500 provides 420 hp @ 5,600 and 460 lb-ft of torque @ 4,100.
It is a 8- speed automatic engine that is available in SLT and Denali.
Towing Packages
There are two packages available in the 2015 GMC Sierra 1500.
The Trailering Package and the Max Trailering Package.
Trailering Package
The Trailering Package in the 2015 GMC Sierra 1500 comes with:
- Trailer hitch platform
- Automatic locking rear differential
- 7-wore trailering harness
- 7-pin/4-pin sealed connector
This package has no influence on the max towing capacity, but it makes the GMC Sierra capable of towing because it provides the necessary equipment.
Max Trailering Package
The Max Trailering Package, unlike the regular Trailering Package, provides additional features that improve the overall towing capacity when in use. It includes:
- Trailering Package
- Trailer Brake Controller
- 9.76″ Ring Gear
- 3.73 Axle Ratio
- Enhanced cooling radiator
- Revised shock tuning
- Heavy-duty rear springs
Max Towing Capacity by Engine
To determine the towing capacity of your vehicle, you need to know the:
- engine type
- bed size
- cab size
- drivetrain
- axle ratio
If you know all of these items, then move on to the next section by engine to determine your towing capacity.
If not:
- Start with the VIN decoder from Autozone to determine the engine in the vehicle
- measure the bed size with a tape measure to determine whether you have a 5 ft 9.9 in, 6 ft 7 in, or 8 ft bed
- The cab size should be evident by whether or not the back doors are full-sized
- Drivetrain should be determined with the VIN as well
- The axle ratio will likely be listed on the side of the driver’s door on the certification sticker
You can find the GVWR and usually the axle ratio on the Safety Compliance Certification Label on the inside of the driver’s side door.
Related: What is GVWR?
4.3 L V6 Engine
The 4.3L V6 engine towing capacity in the 2015 GMC Sierra 1500 ranges from 5,500 – 7,600 lbs.
| Axle Ratio | Towing Capacity (lbs) | GCWR (lbs) | |
| Crew Cab Short Bed 4×2/4×4 | 3.23/3.42 | 5,600/7,100 | 11,000/12,800 |
| Crew Cab Standard Bed 4×2/4×4 | 3.23/3.42 | 5,500/7,000 | 11,000/12,800 |
| Double Cab Standard Bed 4×2/4×4 | 3.23/3.42 | 5,600/7,100 | 11,000/12,800 |
| Regular Cab Standard Bed 4×2/4×4 | 3.23/3.42 | 6,100/7,600 | 11,000/12,800 |
| Regular Cab Long Bed 4×2/4×4 | 3.23/3.42 | 5,900/7,400 | 11,000/12,800 |
5.3 L V8 Engine
The 5.3 L V8 engine towing capacity in the 2015 GMC Sierra 1500 ranges from 6,100 – 9,800 lbs without the Max Trailering Package and up to 11,200 lbs with the Max Trailering Package.
| Max Trailering Package/Axle Ratio | Towing Capacity (lbs) | GCWR (lbs) | |
| Crew Cab Short Bed 4×2 | /(3.08/3.42) | 6,400/9,400 | 12,000/15,000 |
| Crew Cab Short Bed 4×4 | /(3.08/3.42) | 6,200/9,200 | 12,000/15,000 |
| Crew Cab Short Bed (4×2/4×4) | X/(3.73) | 11,100/10,900 | 16,700 |
| Crew Cab Standard Bed 4×2 | /(3.08/3.42) | 6,400/9,400 | 12,000/15,000 |
| Crew Cab Standard Bed 4×4 | /(3.08/3.42) | 6,100/9,100 | 12,000/15,000 |
| Crew Cab Standard Bed (4×2/4×4) | X/(3.73) | 11,000/10,800 | 16,700 |
| Double Cab Standard Bed (4×2) | /(3.08/3.42) | 6,500/9,500 | 12,000/15,000 |
| Double Cab Standard Bed 4×4 | /(3.08/3.42) | 6,200/9,200 | 12,000/15,000 |
| Double Cab Standard Bed (4×2/4×4) | X/(3.73) | 11,200/11,000 | 16,700 |
| Regular Cab Standard Bed 4×2 | /(3.08/3.42) | 7,000/9,000 | 12,000/14,000 |
| Regular Cab Standard Bed 4×4 | /(3.08/3.42) | 6,700/8,700 | 12,000/14,000 |
| Regular Cab Long Bed 4×2 | /(3.08/3.42) | 6,800/9,800 | 12,000/15,000 |
| Regular Cab Long Bed 4×4 | /(3.08/3.42) | 6,500/9,500 | 12,000/15,000 |
SIERRA DENALI TOWING CAPACITY FOR THE 5.3L V8 ENGINE
The 2015 Sierra Denali towing capacity ranges from 6,100 – 9,400 lbs.
| Axle Ratio | Towing Capacity (lbs) | GCWR (lbs) | |
| Crew Cab Short Bed 4×2 | 3.08/3.42 | 6,400/9,400 | 15,000 |
| Crew Cab Short Bed 4×4 | 3.08/3.42 | 6,200/9,200 | 15,000 |
| Crew Cab Standard Bed 4×2 | 3.08/3.42 | 6,400/9,400 | 15,000 |
| Crew Cab Standard Bed 4×4 | 3.08/3.42 | 6,100/9,1000 | 15,000 |
6.2 L V8 Engine
The 6.2 L V8 engine towing capacity in the 2015 GMC Sierra 1500 ranges from 9,200 – 12,000 lbs with the Max Trailering Package.
| Max Trailering Package/Axle Ratio | Towing Capacity (lbs) | GCWR (lbs) | |
| Crew Cab Short Bed 4×2/ 4×4 | /3.23 | 9,400/9,200 | 15,000 |
| Crew Cab Short Bed 4×2/4×4 | X/3.42 | 12,000/11,800 | 17,700 |
| Crew Cab Standard Bed 4×2/4×4 | /3.23 | 9,300/9,100 | 15,000 |
| Crew Cab Standard Bed 4×4 | X/3.42 | 11,900/11,700 | 17,700 |
| Double Cab Standard Bed 4×2/4×4 | /3.23 | 9,500/9,200 | 15,000 |
| Double Cab Standard Bed 4×2/4×4 | X/3.42 | 12,000/11,900 | 17,700 |
SIERRA DENALI TOWING CAPACITY FOR THE 6.2L V8 ENGINE
The 2015 Sierra Denali towing capacity ranges from 9,100 – 9,400 lbs.
| Axle Ratio | Towing Capacity (lbs) | GCWR (lbs) | |
| Crew Cab Short Bed 4×2/4×4 | 3.23 | 9,400/9,200 | 15,000 |
| Crew Cab Standard Bed 4×2/4×4 | 3.23 | 9,300/9,100 | 15,000 |
GMC Sierra 1500 Towing Capacity 2015 Chart
2015 GMC Sierra 1500 Fifth Wheel/Gooseneck Towing Capacity
There seems to be no information on the 2015 GMC Sierra 1500 fifth-wheel/ gooseneck towing capacity.
2015 GMC Sierra 1500 Payload Capacity
4.3 L V6 Engine
The 4.3 L V6 engine payload capacity in the 2015 GMC Sierra 1500 ranges from 1,710 – 1,980 lbs.
| Axle Ratio | Payload Capacity (lbs) | GVWR (lbs) | |
| Crew Cab Short Bed 4×2/4×4 | 3.23/3.42 | 1,800/1,790 | 6,900/7,100 |
| Crew Cab Standard Bed 4×2/4×4 | 3.23/3.42 | 1,710/1,710 | 6,900/7,100 |
| Double Cab Standard Bed 4×2/4×4 | 3.23/3.42 | 1,870/1,850 | 6,900/7,100 |
| Regular Cab Standard Bed 4×2/4×4 | 3.23/3.42 | 1,950/1,920 | 6,500/6,700 |
| Regular Cab Long Bed 4×2/4×4 | 3.23/3.42 | 1,980/1,920 | 6,700/6,900 |
5.3 L V8 Engine
The 5.3 L V8 engine payload capacity in the 2015 GMC Sierra 1500 ranges from 1,710 – 2,270 lbs with the NHT Max Trailering Package.
| Max Trailering Package/Axle Ratio | Payload Capacity (lbs) | GVWR (lbs) | |
| Crew Cab Short Bed 4×2 | /(3.08/3.42) | 1,800 | 7,000 |
| Crew Cab Short Bed 4×4 | /(3.08/3.42) | 1,820 | 7,200 |
| Crew Cab Short Bed (4×2) | X/(3.42/3.73) | 2,180 | 7,400 |
| Crew Cab Short Bed (4×4) | X/(3.42/3.73) | 2,060 | 7,400 |
| Crew Cab Standard Bed 4×2 | /(3.08/3.42) | 1,710 | 7,000 |
| Crew Cab Standard Bed 4×4 | /(3.08/3.42) | 1,710 | 7,200 |
| Crew Cab Standard Bed (4×2) | X/(3.42/3.73) | 2,090 | 7,400 |
| Crew Cab Standard Bed (4×4) | X/(3.42/3.73) | 2,100 | 7,600 |
| Double Cab Standard Bed (4×2) | /(3.08/3.42) | 1,870 | 7,000 |
| Double Cab Standard Bed 4×4 | /(3.08/3.42) | 1,850 | 7,200 |
| Double Cab Standard Bed (4×2) | X/(3.42/3.73) | 2,260 | 7,400 |
| Double Cab Standard Bed (4×4) | X/(3.42/3.73) | 2,270 | 7,600 |
| Regular Cab Standard Bed 4×2 | /(3.08/3.42) | 1,940 | 6,600 |
| Regular Cab Standard Bed 4×4 | /(3.08/3.42) | 1,900 | 6,800 |
| Regular Cab Long Bed 4×2 | /(3.08/3.42) | 1,980 | 6,800 |
| Regular Cab Long Bed 4×4 | /(3.08/3.42) | 1,910 | 7,000 |
SIERRA DENALI PAYLOAD CAPACITY FOR THE 5.3L V8 ENGINE
The 2015 Sierra Denali payload capacity ranges from 1,710 – 1,820 lbs.
| Axle Ratio | Payload Capacity (lbs) | GVWR (lbs) | |
| Crew Cab Short Bed 4×2 | 3.08/3.42 | 1,800 | 7,000 |
| Crew Cab Short Bed 4×4 | 3.08/3.42 | 1,820 | 7,200 |
| Crew Cab Standard Bed 4×2 | 3.08/3.42 | 1,710 | 7,000 |
| Crew Cab Standard Bed 4×4 | 3.08/3.42 | 1,710 | 7,200 |
6.2 L V8 Engine
The 6.2 L V8 engine payload capacity in the 2015 GMC Sierra 1500 ranges from 1,660 – 2,130 lbs.
| Max Trailering Package/Axle Ratio | Payload Capacity (lbs) | GVWR (lbs) | |
| Crew Cab Short Bed 4×2/ 4×4 | /3.23 | 1,780/1,740 | 7,000/7,200 |
| Crew Cab Short Bed 4×2/4×4 | X/3.42 | 2,060/2,050 | 7,400/7,600 |
| Crew Cab Standard Bed 4×2/4×4 | /3.23 | 1,690/1,660 | 7,000/7,200 |
| Crew Cab Standard Bed 4×4 | X/3.42 | 1,980/1,970 | 7,400.7,600 |
| Double Cab Standard Bed 4×2/4×4 | /3.23 | 1,840/1,790 | 7,000/7,200 |
| Double Cab Standard Bed 4×2/4×4 | X/3.42 | 2,130/2,110 | 7,400/7,600 |
SIERRA DENALI PAYLOAD CAPACITY FOR THE 6.2L V8 ENGINE
The 2015 Sierra Denali payload capacity for the 6.2L V8 ranges from 1,660 – 1,780 lbs.
| Axle Ratio | Payload Capacity (lbs) | GVWR (lbs) | |
| Crew Cab Short Bed 4×2/4×4 | 3.23 | 1,780/1,740 | 7,000/7,200 |
| Crew Cab Standard Bed 4×2/4×4 | 3.23 | 1,690/1,660 | 7,000/7,200 |
GMC Sierra 1500 Tongue Weight
GMC recommends that the hitch weight for conventional towing should be 10%-15% of the loaded trailer weight. More so, the fifth-wheel or gooseneck tongue weight should be 15% – 25% of the total loaded trailer weight.
The maximum tongue weight for conventional weight-distributing hitch is 1,200 lbs.
A loaded trailer exceeding 2,000 lbs must be equipped with its own brake system, with brakes working on all axles. Any trailer weight over 7,000 lbs requires a weight-distributing hitch.
You must make sure you have the appropriate hitch receiver to accommodate the towing capacity you are targeting.
2015 GMC Sierra 1500 Trims
The GMC Sierra 1500 in the 2015 family has 4 trims.
- Sierra
- SLE
- SLT
- Denali
Elevation Edition and All Terrain packages are available.
Each of these models has various options for customization, engine selection, cab size, and bed size.
GMC Sierra 1500 Cab Sizes
The 2015 GMC Sierra 1500 has three cab sizes. These are the Regular cab, Double cab, and Crew cab.
The Regular Cab has only one row of seating but the other two options have two rows and can seat up to 6 passengers.
The Crew cab is the largest cab and provides the most back seat legroom for passengers.
The regular cab is only compatible with the long bed and the double cab is only available with the standard bed.
GMC Sierra 1500 Bed Sizes
The GMC Sierra 1500 has three bed sizes. They have a 5’8″ bed, a 6’6″ bed, and an 8′ bed. These beds are referred to as the short, standard, and long bed respectively.
Regular cab models are offered with an 6’6″ bed or an 8′ bed. The double cab only has the 6’6″ bed, and Crew Cabs are available with 5’8″ and 6’6′ beds.
This bed type is a fleetside truck meaning that the wheel wells stick out into the bed of the truck making the shape no longer perfectly rectangular. This is very common for trucks.
Conclusion
The 2015 GMC Sierra 1500 has a towing capacity ranging from 5,500 – 12,000 lbs.
The engine type, drive, cab size, and bed size can all impact the towing capacity.
You should always do your own towing capacity calculations before you ever tow anything, especially those that are close to these limits.
If you need help calculating your towing capacity, I wrote an entire article that walks you through the steps to calculate your towing capacity along with other considerations you need to make when towing.
