The GMC Sierra 2500HD is a full-size heavy-duty pickup truck produced by General Motors under the GMC brand. It has been continuously available since 1999 and is currently offered as a 2026 model year vehicle, built on two key platforms: the K2XX platform (2015-2019) and the T1 platform (2020-present).
This guide covers towing specifications by model year from 2015 through 2026, including maximum trailer weight, payload capacity, hitch class, and equipment requirements for each configuration. Following manufacturer-rated towing limits helps protect the engine, transmission, drivetrain, and braking systems from overload damage.
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2026 GMC Sierra 2500HD Towing Capacity
| Specification | Detail |
|---|---|
| Engine Options | 6.6L V8 Gas (401 hp, 464 lb-ft); 6.6L V8 Duramax Turbo-Diesel (470 hp, 975 lb-ft) |
| Drivetrain | 2WD / 4WD |
| Maximum Towing Capacity (Conventional) | 20,000 lbs (9,072 kg) |
| Conventional Towing Capacity (Gas) | 14,500 lbs (6,577 kg) |
| Fifth-Wheel / Gooseneck Capacity | 21,870 lbs (9,920 kg) |
| Maximum Payload Capacity | 3,979 lbs (1,805 kg) |
| Gross Combined Weight Rating (GCWR) | Up to 30,000 lbs (13,608 kg) |
| Tongue Weight Limit | Up to 2,000 lbs (907 kg) |
| Hitch Class | Class V |
| Factory Tow Package | Optional (Max Trailering Package) |
The 2026 GMC Sierra 2500HD offers a maximum conventional towing capacity of 20,000 lbs with the 6.6L Duramax Turbo-Diesel engine, rising to 21,870 lbs with a gooseneck hitch. Gas-engine models without the Max Trailering Package are rated at 14,500 lbs conventional, with gooseneck ratings reaching 17,370 lbs. Engine selection and the presence of the factory tow package are the primary factors determining maximum trailer weight.
2025 GMC Sierra 2500HD Towing Capacity
| Specification | Detail |
|---|---|
| Engine Options | 6.6L V8 L8T Gas (401 hp, 464 lb-ft); 6.6L V8 L5P Duramax Turbo-Diesel (470 hp, 975 lb-ft) |
| Drivetrain | 2WD / 4WD |
| Maximum Towing Capacity (Conventional) | 20,000 lbs (9,072 kg) |
| Conventional Towing Capacity (Gas, Crew Cab) | 16,000 lbs (7,258 kg) |
| Fifth-Wheel / Gooseneck Capacity | 22,390 lbs (10,156 kg) |
| Maximum Payload Capacity | 3,979 lbs (1,805 kg) |
| Gross Combined Weight Rating (GCWR) | Up to 30,200 lbs (13,698 kg) |
| Tongue Weight Limit | Up to 2,000 lbs (907 kg) |
| Hitch Class | Class V |
| Factory Tow Package | Optional (NHT Max Trailering Package) |
The 2025 GMC Sierra 2500HD reaches a maximum conventional towing capacity of 20,000 lbs with the Duramax diesel and NHT Max Trailering Package on Crew Cab models. Gooseneck configurations on the Regular Cab Long Bed 2WD with diesel and NHT peak at 22,390 lbs (10,156 kg). Gas-equipped Crew Cab models with a 3.73 axle ratio achieve 16,000 lbs conventional, compared to 14,500 lbs on Double Cab and Regular Cab configurations.
2024 GMC Sierra 2500HD Towing Capacity
| Specification | Detail |
|---|---|
| Engine Options | 6.6L V8 L8T Gas (401 hp, 464 lb-ft); 6.6L V8 L5P Duramax Turbo-Diesel (470 hp, 975 lb-ft) |
| Drivetrain | 2WD / 4WD |
| Maximum Towing Capacity (Conventional) | 20,000 lbs (9,072 kg) |
| Conventional Towing Capacity (Gas, Crew Cab) | 16,000 lbs (7,258 kg) |
| Fifth-Wheel / Gooseneck Capacity | 22,500 lbs (10,206 kg) |
| Maximum Payload Capacity | 3,979 lbs (1,805 kg) |
| Gross Combined Weight Rating (GCWR) | Up to 30,200 lbs (13,698 kg) |
| Tongue Weight Limit | Up to 2,000 lbs (907 kg) |
| Hitch Class | Class V |
| Factory Tow Package | Optional (NHT Max Trailering Package) |
The 2024 GMC Sierra 2500HD received a mid-cycle refresh that upgraded the Duramax diesel to 470 hp and 975 lb-ft of torque, an increase from 445 hp and 910 lb-ft in prior years. The Allison 10-speed automatic transmission was also extended to gas-engine models as part of the refresh, replacing the GM 6-speed. Maximum gooseneck towing capacity for the 2500HD Crew Cab reached 21,900 lbs, with the overall lineup reaching 22,500 lbs.
2023 GMC Sierra 2500HD Towing Capacity
| Specification | Detail |
|---|---|
| Engine Options | 6.6L V8 L8T Gas (401 hp, 464 lb-ft); 6.6L V8 L5P Duramax Turbo-Diesel (445 hp, 910 lb-ft) |
| Drivetrain | 2WD / 4WD |
| Maximum Towing Capacity (Conventional) | 18,500 lbs (8,392 kg) |
| Conventional Towing Capacity (Gas) | 14,500 lbs (6,577 kg) |
| Fifth-Wheel / Gooseneck Capacity | 18,500 lbs (8,392 kg) |
| Maximum Payload Capacity | 3,979 lbs (1,805 kg) |
| Gross Combined Weight Rating (GCWR) | Up to 27,300 lbs (12,383 kg) |
| Tongue Weight Limit | Up to 1,850 lbs (839 kg) |
| Hitch Class | Class V |
| Factory Tow Package | Optional |
The 2023 GMC Sierra 2500HD maintained the pre-refresh powertrain with the 6.6L Duramax diesel rated at 445 hp and 910 lb-ft of torque. Maximum conventional towing for diesel Crew Cab models was 18,500 lbs, with payload capacity reaching 3,979 lbs for the highest-rated configurations. Gas-equipped models were limited to 14,500 lbs conventional across most cab and bed combinations.
2022 GMC Sierra 2500HD Towing Capacity
| Specification | Detail |
|---|---|
| Engine Options | 6.6L V8 L8T Gas (401 hp, 464 lb-ft); 6.6L V8 L5P Duramax Turbo-Diesel (445 hp, 910 lb-ft) |
| Drivetrain | 2WD / 4WD |
| Maximum Towing Capacity (Conventional) | 18,500 lbs (8,392 kg) |
| Conventional Towing Capacity (Gas) | 14,500 lbs (6,577 kg) |
| Fifth-Wheel / Gooseneck Capacity | 18,510 lbs (8,396 kg) |
| Maximum Payload Capacity | 3,979 lbs (1,805 kg) |
| Gross Combined Weight Rating (GCWR) | Up to 27,300 lbs (12,383 kg) |
| Tongue Weight Limit | Up to 1,850 lbs (839 kg) |
| Hitch Class | Class V |
| Factory Tow Package | Optional |
The 2022 GMC Sierra 2500HD was the third model year of the fourth-generation T1 platform and carried identical powertrain specifications to 2020 and 2021. Diesel Crew Cab configurations with 2WD or 4WD reached 18,500 lbs conventional towing using the 3.42 axle ratio. The gas engine in 2022 was paired with a GM 6-speed automatic transmission, achieving 14,500 lbs conventional across nearly all cab and bed configurations.
2021 GMC Sierra 2500HD Towing Capacity
| Specification | Detail |
|---|---|
| Engine Options | 6.6L V8 L8T Gas (401 hp, 464 lb-ft); 6.6L V8 L5P Duramax Turbo-Diesel (445 hp, 910 lb-ft) |
| Drivetrain | 2WD / 4WD |
| Maximum Towing Capacity (Conventional) | 18,500 lbs (8,392 kg) |
| Conventional Towing Capacity (Gas) | 14,500 lbs (6,577 kg) |
| Fifth-Wheel / Gooseneck Capacity | 18,500 lbs (8,392 kg) |
| Maximum Payload Capacity | 3,979 lbs (1,805 kg) |
| Gross Combined Weight Rating (GCWR) | Up to 27,300 lbs (12,383 kg) |
| Tongue Weight Limit | Up to 1,850 lbs (839 kg) |
| Hitch Class | Class V |
| Factory Tow Package | Optional |
The 2021 GMC Sierra 2500HD was the second model year of the fourth-generation platform and carried forward the same towing specifications as the 2020 model. GVWR for 2021 Sierra 2500HD configurations was rated at 10,850 lbs. Maximum conventional towing of 18,500 lbs required the diesel engine and proper equipment in Crew Cab body configurations.
2020 GMC Sierra 2500HD Towing Capacity
| Specification | Detail |
|---|---|
| Engine Options | 6.6L V8 L8T Gas (401 hp, 464 lb-ft); 6.6L V8 L5P Duramax Turbo-Diesel (445 hp, 910 lb-ft) |
| Drivetrain | 2WD / 4WD |
| Maximum Towing Capacity (Conventional) | 18,500 lbs (8,392 kg) |
| Conventional Towing Capacity (Gas) | 14,500 lbs (6,577 kg) |
| Fifth-Wheel / Gooseneck Capacity | 18,500 lbs (8,392 kg) |
| Maximum Payload Capacity | 3,979 lbs (1,805 kg) |
| Gross Combined Weight Rating (GCWR) | Up to 27,300 lbs (12,383 kg) |
| Tongue Weight Limit | Up to 1,850 lbs (839 kg) |
| Hitch Class | Class V |
| Factory Tow Package | Optional |
The 2020 GMC Sierra 2500HD introduced the fourth-generation GM T1 platform, replacing the K2XX-based third-generation architecture. The platform brought a new 6.6L V8 L8T gasoline engine alongside the updated L5P Duramax diesel, rated at 445 hp and 910 lb-ft of torque. Maximum towing capacity of 18,500 lbs was achievable with the diesel Crew Cab configuration when properly equipped.
2019 GMC Sierra 2500HD Towing Capacity
| Specification | Detail |
|---|---|
| Engine Options | 6.0L V8 Vortec Gas (360 hp, 380 lb-ft); 6.6L V8 L5P Duramax Turbo-Diesel (445 hp, 910 lb-ft) |
| Drivetrain | 2WD / 4WD |
| Maximum Towing Capacity (Conventional) | 18,100 lbs (8,209 kg) |
| Conventional Towing Capacity (Gas) | 13,000 lbs (5,897 kg) |
| Fifth-Wheel / Gooseneck Capacity | 18,100 lbs (8,209 kg) |
| Maximum Payload Capacity | 3,089 lbs (1,401 kg) |
| Gross Combined Weight Rating (GCWR) | Up to 25,500 lbs (11,567 kg) |
| Tongue Weight Limit | Up to 1,810 lbs (821 kg) |
| Hitch Class | Class V |
| Factory Tow Package | Optional |
The 2019 GMC Sierra 2500HD was the final model year of the third-generation K2XX platform before the all-new 2020 redesign. The L5P Duramax diesel, first introduced in 2017, continued as the high-towing option with 445 hp and 910 lb-ft of torque paired with an Allison 10-speed automatic. Maximum conventional towing capacity with the diesel reached 18,100 lbs when properly equipped.
2018 GMC Sierra 2500HD Towing Capacity
| Specification | Detail |
|---|---|
| Engine Options | 6.0L V8 Vortec Gas (360 hp, 380 lb-ft); 6.6L V8 L5P Duramax Turbo-Diesel (445 hp, 910 lb-ft) |
| Drivetrain | 2WD / 4WD |
| Maximum Towing Capacity (Conventional) | 18,100 lbs (8,209 kg) |
| Conventional Towing Capacity (Gas) | 13,000 lbs (5,897 kg) |
| Fifth-Wheel / Gooseneck Capacity | 18,100 lbs (8,209 kg) |
| Maximum Payload Capacity | 3,089 lbs (1,401 kg) |
| Gross Combined Weight Rating (GCWR) | Up to 25,500 lbs (11,567 kg) |
| Tongue Weight Limit | Up to 1,810 lbs (821 kg) |
| Hitch Class | Class V |
| Factory Tow Package | Optional |
The 2018 GMC Sierra 2500HD continued with the L5P Duramax diesel introduced the previous year, delivering 445 hp and 910 lb-ft of torque with the Allison 10-speed automatic transmission. Towing figures matched the 2019 model at 18,100 lbs maximum conventional capacity for diesel-equipped models. The 6.0L Vortec gas engine remained the base powertrain option for lighter-duty towing applications.
2017 GMC Sierra 2500HD Towing Capacity
| Specification | Detail |
|---|---|
| Engine Options | 6.0L V8 Vortec Gas (360 hp, 380 lb-ft); 6.6L V8 L5P Duramax Turbo-Diesel (445 hp, 910 lb-ft) |
| Drivetrain | 2WD / 4WD |
| Maximum Towing Capacity (Conventional) | 18,100 lbs (8,209 kg) |
| Conventional Towing Capacity (Gas) | 13,000 lbs (5,897 kg) |
| Fifth-Wheel / Gooseneck Capacity | 18,100 lbs (8,209 kg) |
| Maximum Payload Capacity | 3,089 lbs (1,401 kg) |
| Gross Combined Weight Rating (GCWR) | Up to 25,500 lbs (11,567 kg) |
| Tongue Weight Limit | Up to 1,810 lbs (821 kg) |
| Hitch Class | Class V |
| Factory Tow Package | Optional |
The 2017 GMC Sierra 2500HD marked the introduction of the L5P Duramax diesel, replacing the LML engine that had been in production since 2011. The new L5P produced 445 hp and 910 lb-ft of torque paired with an Allison 10-speed automatic transmission, offering improved output and efficiency over the prior unit. Maximum conventional towing capacity increased over the 2016 LML-based models as a result of the updated engine and transmission combination.
2016 GMC Sierra 2500HD Towing Capacity
| Specification | Detail |
|---|---|
| Engine Options | 6.0L V8 Vortec Gas (360 hp, 380 lb-ft); 6.6L V8 LML Duramax Turbo-Diesel (397 hp, 765 lb-ft) |
| Drivetrain | 2WD / 4WD |
| Maximum Towing Capacity (Conventional) | 18,100 lbs (8,209 kg) – diesel |
| Conventional Towing Capacity (Gas) | 13,000 lbs (5,897 kg) |
| Fifth-Wheel / Gooseneck Capacity | Up to 18,100 lbs (8,209 kg) |
| Maximum Payload Capacity | 2,942 lbs (1,334 kg) |
| Gross Combined Weight Rating (GCWR) | Up to 23,500 lbs (10,659 kg) |
| Tongue Weight Limit | Up to 1,810 lbs (821 kg) |
| Hitch Class | Class V |
| Factory Tow Package | Optional |
The 2016 GMC Sierra 2500HD used the LML Duramax diesel producing 397 hp and 765 lb-ft of torque, paired with an Allison 6-speed automatic transmission. Gas-equipped models had a maximum conventional towing capacity of 13,000 lbs, while diesel models reached 18,100 lbs when properly equipped. Maximum payload for 2016 configurations was rated at 2,942 lbs.
2015 GMC Sierra 2500HD Towing Capacity
| Specification | Detail |
|---|---|
| Engine Options | 6.0L V8 Vortec Gas (360 hp, 380 lb-ft); 6.6L V8 LML Duramax Turbo-Diesel (397 hp, 765 lb-ft) |
| Drivetrain | 2WD / 4WD |
| Maximum Towing Capacity (Conventional) | 18,100 lbs (8,209 kg) – diesel |
| Conventional Towing Capacity (Gas) | 13,000 lbs (5,897 kg) |
| Fifth-Wheel / Gooseneck Capacity | Up to 18,100 lbs (8,209 kg) |
| Maximum Payload Capacity | 2,942 lbs (1,334 kg) |
| Gross Combined Weight Rating (GCWR) | Up to 23,500 lbs (10,659 kg) |
| Tongue Weight Limit | Up to 1,810 lbs (821 kg) |
| Hitch Class | Class V |
| Factory Tow Package | Optional |
The 2015 GMC Sierra 2500HD was the first model year of the third-generation K2XX platform redesign, introducing updated styling alongside the carry-over LML Duramax diesel. The LML diesel was rated at 397 hp and 765 lb-ft of torque and mated to an Allison 6-speed automatic transmission. Diesel models with conventional towing equipment reached 18,100 lbs, while gas models were rated at 13,000 lbs.
Towing Equipment and Setup Guide
Proper towing equipment and setup are essential for operating the GMC Sierra 2500HD within its manufacturer-rated towing limits.
Tow Package
The factory Max Trailering Package (option code NHT) for recent Sierra 2500HD models includes an automatic locking rear differential, upgraded suspension components, a rear axle ratio optimized for heavy towing, and enhanced cooling systems. Without this package, maximum towing capacity is reduced in most configurations, particularly for diesel-powered models seeking ratings above 18,500 lbs.
Trailer Brake Controller
Federal and state regulations in the United States require trailer brakes on trailers exceeding 3,000 lbs gross trailer weight in most jurisdictions. The Sierra 2500HD supports integrated trailer brake controllers through the factory 7-pin wiring harness. A calibrated brake controller reduces stopping distances and prevents brake fade when towing heavy loads.
Weight-Distributing Hitch
For trailers above 10,000 lbs gross trailer weight, a weight-distributing hitch redistributes tongue weight evenly across the front and rear axles. This maintains front-axle contact pressure, which directly affects steering response and braking performance under load. Class V weight-distributing systems are rated for up to 20,000 lbs gross trailer weight in most configurations.
Transmission Cooler
The factory tow package includes an auxiliary transmission cooler on recent Sierra 2500HD configurations. Operating without adequate transmission cooling during sustained heavy towing, particularly in high ambient temperatures or mountain grades, reduces transmission fluid life and component longevity. Aftermarket auxiliary coolers are available for models not equipped with the factory package.
Proper Tire Load Ratings
Tire load capacity must match or exceed the vehicle’s maximum loaded weight for the towing configuration in use. Load Range E tires rated to 80 psi are standard on most 2500HD towing configurations. Using tires with insufficient load ratings reduces the effective towing and payload capacity of the vehicle.
Trailer Sway Control
The Sierra 2500HD includes trailer sway control as part of its electronic stability control system, which applies individual wheel brakes and reduces engine output when lateral trailer oscillation is detected. This system supplements but does not replace proper trailer loading and weight distribution practices.
Normal Towing vs. Heavy Towing Setup
| Component | Normal Towing (under 10,000 lbs) | Heavy Towing (over 10,000 lbs) |
|---|---|---|
| Hitch Type | Class III / IV ball mount | Class V ball mount or fifth-wheel |
| Trailer Brakes | Recommended | Required |
| Weight Distribution | Optional | Recommended |
| Transmission Cooler | Standard | Factory or aftermarket auxiliary |
| Sway Control | Electronic (factory) | Electronic plus weight-distribution bar |
| Tow Package | Optional | Strongly recommended |
Frequently Asked Questions
What is the maximum towing capacity of a GMC Sierra 2500HD?
The maximum towing capacity of the GMC Sierra 2500HD is 22,390 lbs (10,156 kg) using a gooseneck hitch on the 2025 Regular Cab Long Bed 2WD model with the 6.6L Duramax diesel and NHT package. Conventional ball hitch towing peaks at 20,000 lbs for diesel Crew Cab models with the NHT package on 2024-2026 configurations. Earlier model years prior to the 2024 refresh were rated at a maximum of 18,500 lbs conventional.
How much can a GMC Sierra 2500HD tow with a tow package?
With the factory Max Trailering Package, the GMC Sierra 2500HD tows up to 20,000 lbs conventionally and up to 22,390 lbs with a gooseneck hitch as of the 2025 model year. Gas-powered Crew Cab models with the tow package and 3.73 axle reach up to 16,000 lbs conventional on 2024-2026 configurations. Without the NHT package, diesel Crew Cab models are typically limited to 18,500 lbs conventional.
Does 4WD affect GMC Sierra 2500HD towing capacity?
Yes, 4WD configurations typically carry a marginally lower towing capacity rating than equivalent 2WD models in the Sierra 2500HD lineup. For example, a 2025 Crew Cab Long Bed diesel 4WD with NHT reaches 21,500 lbs gooseneck, compared to 21,870 lbs for the same 2WD configuration. The reduction results from the added weight of the transfer case and front axle assembly affecting the Gross Combined Weight Rating.
What trailer weight is safe for a GMC Sierra 2500HD?
A safe trailer weight is one that does not exceed the manufacturer-rated maximum trailer weight for the specific configuration, while also accounting for all passengers, cargo, and accessories carried in the cab and bed. Tongue weight must not exceed 10-15% of gross trailer weight and must remain within the vehicle’s rated tongue weight limit. The driver-door tire and loading information placard lists the specific ratings for each individual vehicle.
Do I need a weight-distributing hitch for a GMC Sierra 2500HD?
A weight-distributing hitch is recommended for the Sierra 2500HD when towing trailers over 10,000 lbs or when tongue weight exceeds 1,000 lbs. For lighter loads using a standard Class V ball mount, a conventional non-distributing hitch is typically sufficient. Weight distribution maintains front-axle contact pressure, which is critical for steering authority and braking performance during heavy towing.
What hitch class does the GMC Sierra 2500HD use?
The GMC Sierra 2500HD is equipped with a Class V receiver hitch for heavy-duty towing applications. Class V hitches use a 2-inch receiver tube and are rated for gross trailer weights above 18,000 lbs when properly matched to the vehicle’s configuration. Aftermarket Class III hitches are also available for lighter towing applications on the same chassis, typically rated at 6,000 lbs gross trailer weight and 600 lbs tongue weight.
Conclusion
The GMC Sierra 2500HD covers a towing capacity range from 13,000 lbs on pre-2017 gas-engine models to 22,390 lbs on properly equipped 2025 diesel gooseneck configurations. Engine selection is the primary determinant of towing capacity, with diesel models consistently outperforming gas models across all model years covered in this guide. The 2024 mid-cycle refresh increased diesel output to 470 hp and 975 lb-ft of torque, enabling diesel conventional ratings to reach 20,000 lbs for the first time in the Sierra 2500HD lineup.
Configuration variables including cab style, bed length, drivetrain selection, axle ratio, and Max Trailering Package (NHT) all affect the final towing rating for each individual unit. Two identically appearing Sierra 2500HD trucks can carry substantially different towing ratings based on these factors. Always verify specifications using the owner’s manual and the driver-door tire and loading placard before towing heavy loads.
