2020 GMC Sierra 2500HD AT4 Specs

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GMC Sierra 2500HD
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2020 GMC Sierra 2500HD 4WD Crew Cab 159" AT4 powered by 6.6L V8 Gas Engine with 6-Speed Automatic transmission.

Select configuration:
Starting Price (MSRP)
6.6L V8 Gas
6-Speed Automatic
Four-Wheel Drive
Body Type
Seating capacity
5 seater
Trunk Volume
Fuel Economy
City: N/A
Hwy: N/A

Performance Specs

Engine and Transmission

  • Engine
    6.6L V8 Gas
    6.6L Turbo V8 Diesel (+$9,890)
  • Horsepower
    401 hp @ 5200 rpm
  • Torque
    464 lb-ft @ 4000 rpm
  • Transmission
    6-Speed Automatic
    10-Speed Automatic (Optional)
  • Drivetrain
    Four-Wheel Drive


  • Steering Type
    Pwr Recirculating Ball
  • Turning Diameter
    52.7 ft


  • Wheels Type
    Aluminum Wheels
  • Front Wheel Size
    18"" x TBD
  • Rear Wheel Size
    18"" x TBD


  • Front Tire
  • Rear Tire
  • Spare Tire

Fuel and MPG

Fuel Tank

  • Fuel Tank Capacity
    36 gallons

Dimensions and Measurement

Exterior Dimensions

  • Length
    250.08 in
  • Height
    79.82 in
  • Max Width
    81.85 in
  • Wheelbase
    158.94 in

Interior Space

  • Seating Capacity
    5 seater
  • Front Seat Leg Room
    44.53 in
  • Front Seat Headroom
    43.03 in
  • Front Seat Shoulder Room
    66.02 in
  • Front Seat Hip Room
    61.18 in
  • Rear Seat Leg Room
    43.4 in
  • Rear Seat Headroom
    39.88 in
  • Rear Seat Shoulder Room
    65.3 in
  • Rear Seat Hip Room
    60.24 in

Weight and Towing

  • Maximum Towing Capacity
    18,500 lbs

Cargo Box Dimensions

  • Box Length (Floor)
    82.2 in
  • Box Width (Floor)
    71.4 in
  • Box Width (Wheelhousings)
    51.85 in
  • Box Height (Area)
    21 in
  • Cargo Volume
    69.5 ft³

Colors and Materials

Standard Interior Materials

  • Jet Black with Kalahari Accents, Perforated leather-appointed front seat trim

Features and Options


  • HD Radio
  • Bluetooth Connection
  • Hard Disk Drive Media Storage
    Not Available
  • Premium Sound System
  • Satellite Radio
  • Smart Device Integration
    Not Available
  • WiFi Hotspot
  • Auxiliary Audio Input
  • Entertainment System
  • MP3 Player

Interior Trim

  • Bucket Seats
    Not Available
  • Cloth Seats
    Not Available
  • Leather Seats
  • Leather Steering Wheel
  • Premium Synthetic Seats
    Not Available
  • Vinyl Seats
    Not Available
  • Woodgrain Interior Trim
    Not Available
  • Sun/Moonroof


  • Head-Up Display
  • Navigation System
  • Steering Wheel Audio Controls
  • Power Liftgate
    Not Available
  • Power Mirror(s)
  • A/C
  • Adaptive Cruise Control
    Not Available
  • Automatic Parking
    Not Available
  • Climate Control
  • Cooled Front Seat(s)
  • Cooled Rear Seat(s)
    Not Available
  • Cruise Control
  • Hands-Free Liftgate
    Not Available
  • Heated Front Seat(s)
  • Heated Rear Seat(s)
  • Heated Steering Wheel
  • Keyless Entry
  • Multi-Zone A/C
  • Power Driver Seat
  • Power Passenger Seat
  • Remote Engine Start
  • Remote Trunk Release
    Not Available
  • Seat Memory
  • Universal Garage Door Opener
  • Seat-Massage
    Not Available
  • Rear A/C
    Not Available
  • Keyless Start
  • Navigation from Telematics
    Not Available
  • Telematics

Additional Packages

AT4 Preferred Equipment Group

includes standard equipment

AT4 Preferred Package


includes (UG1) Universal Home Remote, (A48) rear sliding power window, (IOT) 8" diagonal Premium GMC Infotainment with navigation, (UQA) Bose Premium Audio System, (U01) Roof Marker Lamps and (K4C) Wireless Charging (Included with (PDG) AT4 Premium Package. Note (U01) Roof Marker Lamps are not available with (YF5) California state emissions requirements.) AT4 Preferred Package Wireless Charging1 Universal Home Remote 8" diagonal Premium GMC Infotainment with Navigation2 Bose®3 Premium Sound System with Richbass® woofer Rear sliding power window LED roof marker lamps

AT4 Premium Package


includes (PDO) AT4 Preferred Package, (PQB) Driver Alert Package I, (PYU) 20" (50.8 cm) machined aluminum with high gloss Black paint wheels and (RVQ) 6" Black rectangular assist steps, LPO (NOTE: (RVQ) 6" Black rectangular assist steps, LPO can be upgraded to (S6L) Off-road, Black assist steps, LPO.) *GROSS* AT4 Premium Package AT4 Preferred Package Universal Home Remote Rear sliding power window 8" diagonal Premium GMC Infotainment with Navigation1 Bose®2 Premium Audio System with Richbass® woofer Wireless Charging3 LED roof marker lamps Driver Alert Package I Front and Rear Park Assist 4 Lane Change Alert with Side Blind Zone Alert4 Rear Cross Traffic Alert4 6" Black rectangular assist steps (upgradeable to Off-Road assist steps) 20" machined aluminum with high gloss Black paint wheels

Driver Alert Package I


includes (UD5) Front and Rear Park Assist, (UKC) Lane Change Alert with Side Blind Zone Alert and (UFG) Rear Cross Traffic Alert (Includes Perimeter Lighting. Included with (PDG) AT4 Premium Package.) Driver Alert Package I Lane Change Alert with Side Blind Zone Alert1 Rear Cross Traffic Alert1 Front and Rear Park Assist1 Perimeter Lighting May require additional optional equipment

Driver Alert Package II


includes (UEU) Forward Collision Alert, (UFL) Lane Departure Warning, (UHY) Automatic Emergency Braking, (TQ5) IntelliBeam headlamps and (UE4) Following Distance Indicator (Requires (PQB) Driver Alert Package I. Includes (HS1) Safety Alert Seat.) Driver Alert Package II Lane Departure Warning1 Automatic Emergency Braking1 Forward Collision Alert1 Following Distance Indicator1 Safety Alert Seat1 IntelliBeam® May require additional optional equipment

Gooseneck / 5th Wheel Package


includes (Z6A) Gooseneck / 5th Wheel Prep Package. (Includes (UVN) Bed View Camera.) Gooseneck / 5th Wheel Package Gooseneck / 5th Wheel Prep Package Hitch platform to accept Gooseneck or Fifth-wheel hitch Hitch platform with tray to accept ball and stamped bed holes with caps installed Bed mounted 7-pin trailer harness Sierra includes trailer brake controller Sierra, SLE and SLT includes Spray-on bed liner SLT, AT4 and Denali includes Bed View Camera1 May require additional optional equipment

Heavy Duty Front Spring/Camper Package


Note: If ordered for Camper usage, recommend ordering (UY2) Trailering wiring provisions (Not available with (VYU) Snow Plow Prep/Camper Package.) Heavy Duty Front Spring / Camper Package

LPO, Cargo Convenience Package


includes (S1O) console vault, LPO and (VBJ) rear under seat storage, LPO, (dealer-installed) Cargo Convenience Package Console vault Rear under seat storage May require additional optional equipment

LPO, Hitch Package


Gooseneck ball and chain tiedown kit with case, (dealer-installed) (Requires (CMT) Gooseneck / 5th Wheel Prep Package. Not available with (VBR) rubber bed mat, LPO.) Gooseneck Hitch Package Gooseneck ball Chain tiedown kit with case May require additional optional equipment

Snow Plow Prep/Camper Package


includes (KW5) 220-amp alternator, includes increased front GAWR on Heavy Duty models, (NZZ) skid plates (transfer case and oil pan), pass through dash grommet hole and roof emergency light provisions. Contact GM Upfitter Integration at www.gmupfitter.com for plow installation details and assistance. Note: if ordered for Camper usage, recommend ordering (UY2) Trailering wiring provisions (Requires 4WD model. Includes (KW5) 220-amp alternator and is upgradeable to (KHF) Dual alternators (220-amp primary, 170-amp auxiliary). Not available with (F60) Heavy Duty Front Spring/Camper Package.) Snow Plow Prep / Camper Package Power feed to accommodate a backup and roof emergency light1 A single 220-amp alternator Heavy-duty front springs Under body skid plates to help protect the transfer case from debris May require additional optional equipment

Technology Package


includes (UVS) HD Surround Vision, (DRZ) Rear Camera Mirror, (UVN) Bed View Camera and (UV6) Multicolor 15" Diagonal Head-Up Display (Requires (PDJ) Driver Alert Package II and (PDO) AT4 Preferred Package. Includes (UHS) 8" Digital Driver information Center.) Technology Package HD Surround Vision1 Rear Camera Mirror1 Multi-color 15" Diagonal Head-Up Display1 Bed View Camera1 8" diagonal Digital Driver Information Center on SLT and AT4 May require additional optional equipment


Safety Features

  • Back-Up Camera
  • Cross-Traffic Alert
  • Rear Parking Aid
  • Blind Spot Monitor
  • Lane Departure Warning
  • Lane Keeping Assist
    Not Available
  • ABS
  • Night Vision
    Not Available
  • Tire Pressure Monitor
  • Brake Assist
    Not Available
  • Stability Control
  • Traction Control


  • Driver Air Bag
  • Front Head Air Bag
  • Front Side Air Bag
  • Knee Air Bag
    Not Available
  • Passenger Air Bag
  • Rear Head Air Bag
  • Rear Side Air Bag
    Not Available
  • Seatbelt Air Bag
    Not Available


Warranty Summary

  • Basic
    3 Years / 36,000 Miles
  • Corrosion
    3 Years / 36,000 Miles
  • Drivetrain Note
    HD Duramax Diesel: 5 Years/100,000 Miles; Qualified Fleet Purchases: 5 Years/100,000 Miles
  • Drivetrain
    5 Years / 60,000 Miles
  • Maintenance Note
    1 Year/1 Visit
  • Roadside Assistance Note
    HD Duramax Diesel: 5 Years/100,000 Miles; Qualified Fleet Purchases: 5 Years/100,000 Miles
  • Roadside Assistance
    5 Years / 60,000 Miles
  • Rust-Through
    6 Years / 100,000 Miles
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