2021 GMC AT4 AT4

Dealership Vehicle Description
Performance & Specs
Interior
Exterior
Safety

Discover the unparalleled capability and rugged sophistication of the 2021 GMC Sierra 1500 AT4. This commanding truck is engineered to conquer any terrain with its robust 6.2L V8 EcoTec3 engine, delivering an impressive 420 horsepower and 460 lb-ft of torque.

- 6.2L V8 EcoTec3 engine with Dynamic Fuel Management
- 20 machined aluminum wheels with carbon grey metallic accents
- LT265/60R20 MT Blackwall Goodyear Wrangler Territory tires
- Dealer-installed sport step and wheel locks

The Sierra AT4 is equipped with a wealth of premium features to elevate your driving experience:

- 6-speaker premium audio system with SiriusXM 360L
- Heated and ventilated front seats with 10-way power adjusters
- Heated steering wheel and dual-zone automatic climate control
- 120-volt power outlets in the cabin and cargo bed
- Spray-on bedliner with AT4 logo

This rugged yet refined truck is ready to tackle any adventure. With its off-road-tuned suspension, 4WD capabilities, and ProGrade trailering system, the Sierra AT4 is the ultimate companion for your next journey.

Experience the uncompromising performance and unparalleled style of the 2021 GMC Sierra 1500 AT4. Schedule a test drive today and discover why this truck is the perfect blend of power and sophistication.

To be sure you don't miss out, give us a call at 512-643-1534 and schedule a test drive. We are located at 3000 N Interstate Hwy 35 Round Rock TX 78681. We look forward to seeing you soon.

Price does not include tax, title, license, registration, dealer documentary fee, or dealer installed accessories

Air filter
heavy-duty
Alternator
170 amps (Included and only available with (L84) 5.3L EcoTec3 V8 engine or (L87) 6.2L EcoTec3 V8 engine. Not available with (LM2) Duramax 3.0L Turbo-Diesel I6 engine.)
Auto-locking rear differential
Automatic Stop/Start (Standard on vehicles built before 6-7-2021. Most vehicles built on or after 6-7-2021 that are equipped with a V8 engine and (MQB) 10-speed automatic transmission will have (NSS) Not Equipped with Automatic Stop/Start
which removes Automatic Stop/Start and its content. See dealer for details)
Battery
heavy-duty 730 cold-cranking amps/80 Amp-hr, maintenance-free with rundown protection and retained accessory power (Included and only available with (L84) 5.3L EcoTec3 V8 engine, (L3B) 2.7L Turbo engine and (L87) 6.2L EcoTec3 V8 engine.)
Brakes
4-wheel antilock, 4-wheel disc with DURALIFE rotors
Capless Fuel Fill
Cargo tie downs (12)
fixed, rated at 500 lbs per corner
Cooling
auxiliary external transmission oil cooler (Not available with (LM2) Duramax 3.0L Turbo-Diesel I6 engine.)
Cooling
external engine oil cooler (Not available with (LM2) Duramax 3.0L Turbo-Diesel I6 engine.)
Engine
5.3L EcoTec3 V8 (355 hp [265 kW] @ 5600 rpm, 383 lb-ft of torque [518 Nm] @ 4100 rpm); featuring available Dynamic Fuel Management that enables the engine to operate in 17 different patterns between 2 and 8 cylinders, depending on demand, to optimize power delivery and efficiency (Not available on TK10743 model.)
Exhaust
aluminized stainless-steel muffler and tailpipe
Exhaust
dual with premium tips (With (PCP) AT4 CarbonPro Edition the exhaust tips will be black.)
Four wheel drive
Frame
fully-boxed, hydroformed front section
GVWR
7000 lbs. (3175 kg) (Requires Crew Cab model with (L84) 5.3L EcoTec3 V8 engine or (L87) 6.2L EcoTec3 V8 engine.)
Hill Descent Control
Pickup bed
Rear axle
3.23 ratio
Recovery hooks
Red
Skid Plates
Steering
Electric Power Steering (EPS) assist, rack-and-pinion
Suspension
Off-Road with 2 factory installed lift and monotube shocks
Trailer brake controller
integrated
Transfer case
two-speed, electronic Autotrac with push button control (4WD models only)
Transmission
10-speed automatic, electronically controlled with overdrive and tow/haul mode. Includes Cruise Grade Braking and Powertrain Grade Braking (Most vehicles built on or after 6-7-2021 with a V8 engine and (MQB) 10-speed automatic transmission will have (NSS) Not Equipped with Automatic Stop/Start, which removes Automatic Stop/Start and its content.)

4G LTE Wi-Fi Hotspot capable (Terms and limitations apply. See onstar.com or dealer for details.)
Air conditioning
dual-zone automatic climate control
Air vents
rear
Assist handles front A-pillar mounted for driver and passenger
rear B-pillar mounted
Audio system feature
6-speaker system
Audio system
Premium GMC Infotainment System with 8 diagonal color touch-screen, includes multi-touch display, AM/FM stereo Bluetooth streaming audio for music and most phones; featuring wireless Android Auto and Apple CarPlay capability for compatible phones, advanced voice recognition, in-vehicle apps, personalized profiles for infotainment and vehicle settings (Note: (PZ8) Hitch Guidance with hitch view is included with trim. Includes SiriusXM with 360L.)
Bluetooth for phone connectivity to vehicle infotainment system
Brake lining wear indicator
Center Console
floor-mounted with cup holders, cell phone storage, power cord management, hanging file folder capability
Compass
located in instrument cluster
Cruise control
steering wheel-mounted
Defogger
rear-window electric
Door locks
power
Driver Information Center
4.2 diagonal color display includes driver personalization
Driver memory recalls driver presets for power driver seat and outside mirrors
Exterior Temperature Display
located in radio display
Floor covering
color-keyed carpeting
GMC Connected Access capable (Subject to terms. See onstar.com or dealer for details.)
HD Radio (Standard on vehicles built before 7-12-2021. Certain vehicles built on or after 7-12-2021 will include (RG0) Not Equipped with HD Radio
which removes (U2L) HD Radio. See dealer for details.)
In-vehicle Trailering App
System includes checklist, trailer maintenance reminders, trailer security alerts, trailer mileage, tow/haul reminder and trailer electrical diagnostics
Instrument cluster
6-gauge cluster featuring speedometer, fuel level, engine temperature, tachometer, voltage and oil pressure
Keyless Open and Start
Mirror
inside rearview auto-dimming
Power outlet
bed mounted, 120-volt (400 watts shared with (KI4) instrument panel mounted power outlet)
Power outlet
front auxiliary, 12-volt
Power outlet
instrument panel, 120-volt (400 watts shared with (KC9) bed mounted power outlet)
Power outlet
rear auxiliary, 12-volt
Premium Floor Liners with removable carpet insert
front
Premium Floor Liners with removable carpet insert
rear
Remote vehicle starter system
Seat adjuster
driver 10-way power including lumbar
Seat adjuster
passenger 10-way power including lumbar
Seat
Up-level Rear with Storage Package, 60/40 folding bench for Crew Cab models, includes full-length bench seat, seatback storage on left and right side, center fold out armrest with 2 cupholders, full cab width under-seat storage, (includes child seat top tether anchor)
Seating
heated driver and front outboard passenger
Seats
front bucket with center console
Seats
ventilated driver and front passenger
SiriusXM Radio
SiriusXM with 360L Equipped with SiriusXM with 360L. Enjoy a trial subscription of the All Access package for the full 360L experience
with a greater variety of SiriusXM content, a more personalized experience and easier navigation. With the All Access package, you can also enjoy your favorites everywhere you go, with the SiriusXM app, online and at home on compatible connected devices. (IMPORTANT: The SiriusXM radio trial package is not provided on vehicles that are ordered for Fleet Daily Rental (FDR) use. If you decide to continue service after your trial, the subscription plan you choose will automatically renew thereafter and you will be charged according to your chosen payment method at then-current rates. Fees and taxes apply. See the SiriusXM Customer Agreement at www.siriusxm.com for complete terms and how to cancel. All fees, content, features, and availability are subject to change. GM connected vehicle services vary by vehicle model and require active service plan, working electrical system, cell reception and GPS signal. See onstar.com for details and limitations.)
Steering column
lock control, electrical
Steering column
manual Tilt-Wheel and telescoping
Steering wheel audio controls
Steering wheel
heated
Steering wheel
leather-wrapped
Theft-deterrent system
unauthorized entry
USB Ports (Inside Console with bucket seats)
2 also includes 1 SD card reader and auxiliary jack
USB ports
2 (first row) located on instrument panel
USB ports
dual, charge-only (2nd row)
Window
power front, passenger express up/down
Windows
power front, drivers express up/down
Windows
power rear, express down
Wireless Phone Projection
for Apple CarPlay and Android Auto

Bed Liner
Spray-on Pickup bedliner with GMC logo (does not include spray-on liner on tailgate due to Black composite inner panel) (AT4 logo replaces GMC logo. Deleted with (PCP) AT4 CarbonPro Edition. Double Cab and Crew Cab models are available with Ship Thru codes (VBE), (VCO), (VDT), (VYC) or (VYS).)
Bumper
front, body-color lower (Front bumper color will be high gloss black.)
Bumper
rear body-color with corner steps
CornerStep
rear bumper
Door handles
body-color
Fog lamps
LED
Glass
deep-tinted
Grille (Body-color surround with high gloss Black mesh and Black chrome inserts. With (PCP) AT4 CarbonPro Edition the grille will have a unique grille surround with Black Chrome finish.)
Headlamps
LED reflector (high intensity) with LED turn signals and LED signature Daytime Running Lamps
Lamps
cargo area, cab mounted integrated with center high mount stop lamp, with switch in bank on left side of steering wheel
LED Cargo Area Lighting located in cargo bed activated with switch on center switch bank or key fob
Mirror caps
high gloss Black (Deleted with (DQS) outside power adjustable vertical trailering mirrors and mirror caps will be chrome.)
Mirrors
outside heated power-adjustable, power-folding and driver-side auto-dimming puddle lamps, side perimeter lighting and memory
Tailgate and bed rail protection caps
top
Tailgate
gate function manual with EZ Lift includes power lock and release, includes hitch area light
Tailgate
GMC MultiPro Tailgate with six functional load/access features
Taillamps
LED signature taillight with LED stop and reverse light
Tire carrier lock keyed cylinder lock that utilizes same key as ignition and door
Tire
spare 265/70R17SL all-season, blackwall
Tires
265/65R18SL all-terrain, blackwall
Wheel
17 x 8 (43.2 cm x 20.3 cm) full-size, steel spare
Wheelhouse liners
rear
Wheels
18 x 8.5 (45.7 cm x 21.6 cm) machined aluminum with Dark Grey accents

Airbags
dual-stage frontal airbags for driver and front outboard passenger; Seat-mounted side-impact airbags for driver and front outboard passenger; Head-curtain airbags for front and rear outboard seating positions; Includes front outboard Passenger Sensing System for frontal outboard passenger airbag (Always use seat belts and child restraints. Children are safer when properly secured in a rear seat in the appropriate child restraint. See the Owner's Manual for more information.)
Daytime Running Lamps
LED signature lighting
HD Rear Vision Camera
Hitch Guidance
Hitch Guidance with Hitch View with image adjustment
Pan/Zoom/Tilt
OnStar and GMC connected services capable (Terms and limitations apply. See onstar.com or dealer for details.)
Rear Seat Reminder
StabiliTrak
stability control system with Proactive Roll Avoidance and traction control, includes electronic trailer sway control and hill start assist
Teen Driver a configurable feature that lets you activate customizable vehicle settings associated with a key fob
to help encourage safe driving behavior. It can limit certain available vehicle features, and it prevents certain safety systems from being turned off. An in-vehicle report card gives you information on driving habits and helps you to continue to coach your new driver
Tire Pressure Monitoring System with Tire Fill Alert (does not apply to spare tire)