Used 2021 GMC Sierra 1500 AT4
10-Speed Automatic
Vehicle Summary
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Summit White
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Jet Black w/Kalahari Accents
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VIN 1GTU9EET8MZ256542
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Stock # RP2451
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Condition Used
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Exterior Summit White
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Interior Jet Black w/Kalahari Accents
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Engine 3.0L I6
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Drivetrain 4x4
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Transmission 10-Speed Automatic
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Location Diehl of Robinson
Mile
Miles
MPG FUEL ECONOMY
CITY
HWY
AVG
Horsepower
HP
Torque
Key Features
Backup Camera
Tow Package
Fog Lights
Side-Impact Air Bags
Bluetooth
Alloy Wheels
Leather Seats
Automatic Climate Control
Cruise Control
Remote Start
Push Start
Keyless Entry
Android Auto
Apple Car Play
Wifi Hotspot
Collision Avoidance
Premium Package
Technology Package
Vehicle Description
2021 GMC Sierra 1500 AT4 Crew Cab 4x4 — Duramax Diesel, CarbonPro Bed, Tech Package, and Off Road Luxury
If a truck could wear a fitted tuxedo and steel toe boots at the same time, it would be this 2021 GMC Sierra 1500 AT4 Crew Cab 4x4. Built for drivers who want real off road capability wrapped in premium comfort, this AT4 checks every box and even invents a few new ones.
Powered by the legendary 3.0L Duramax turbo diesel, this Sierra delivers smooth torque, impressive fuel efficiency, and the kind of quiet strength that makes towing feel effortless. Paired with GMC’s advanced 4x4 system, off road suspension, skid plates, and hill descent control, the AT4 is built for mud, gravel, snow, and whatever the world throws at it.
This one brings the upgrades that matter, starting with the CarbonPro Edition. The carbon fiber composite bed is dent proof, rust proof, and about as close as you can get to indestructible in a pickup. Add the MultiPro tailgate, LED bed lighting, tie downs, and factory spray in liner and you get one of the most practical truck beds ever engineered.
Inside, the AT4 Premium Package elevates comfort with leather appointed Jet Black and Kalahari seats, a power sliding rear window, multiple power outlets, heated front and rear seats, a heated steering wheel, and 10 way power adjustments. The Technology Package loads in a crisp head up display, rear camera mirror, and advanced surround camera system that makes parking and trail running equally stress free. You also get the AT4 Driver Alert Package with lane change alert, blind zone monitoring, forward collision alert, and more.
The exterior finishes the look with the Summit White paint, 20 inch dark gray painted aluminum wheels, vertical trailering mirrors, and AT4 skid plate accents that remind everyone this truck is not afraid to get dirty.
If you want a truck that blends luxury, toughness, and next level engineering, this 2021 Sierra 1500 AT4 is the one you will compare everything else to. Stop by Diehl of Robinson today and take the Duramax powered AT4 for a drive. One run down the road and you will understand why AT4 owners refuse to switch brands.
Carfax®
Vehicle Features
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Interior
- Ventilated driver and front passenger seats
- Heated steering wheel
- Heated driver and front passenger seats
- Leather front seat upholstery
- Driver seat power reclining, lumbar support, cushion tilt, fore/aft control and height adjustable control
- Dual-zone front climate control
- Automatic climate control
- Leather and metal-look steering wheel
- Manual tilting steering wheel
- Manual telescopic steering wheel
- Vinyl rear seat upholstery
- Rear console climate control ducts
- Bucket front seats
- Driver seat with 8-way directional controls
- Front seat center armrest
- Front passenger seat with 8-way directional controls
- Driver seat with 2-way power lumbar
- Front passenger seat with 2-way power lumbar
- Split-bench rear seat
- Fold-up rear seat cushion
- 60-40 folding rear seats
- Rear seat center armrest
- Seating capacity: 5
- Deep tinted windows
- Passenger seat power reclining, lumbar support, cushion tilt, fore/aft control and height adjustable control
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Exterior
- Hitch Guidance vehicle to trailer hitching assist
- GMC ProGrade Trailering System trailer light test
- GMC ProGrade Trailering System trailer light malfunction warning
- GMC ProGrade Trailering System trailer theft alarm
- Trailer brake controller
- Trailer Sway Control (TSC) trailer sway control
- Trailering Assist Guidelines vehicle and trailer reverse assist with visual graphic guidance only
- Trailer hitch light
- Trailer wiring harness
- Class IV tow rating
- Trailer hitch
- 2 underbody skid plates
- Spray-in pickup bed liner
- Pickup bed extender
- Pickup bed-rail protectors
- Full-size spare tire with steel wheel
- Crank-down spare tire
- 2 front tow hooks
- LED in-box lighting
- 4 doors
- Body-colored front bumper
- Body-colored rear bumper
- Black fender flares
- Black side window trim
- Body-colored door handles
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Mechanical
- AutoTrac part and full-time 4WD
- Auto stop-start engine
- 10-speed automatic
- Tow/Haul Mode selectable mode transmission
- Transmission electronic control
- Sequential shift control
- Automatic
- Four-wheel drive
- Off-road ride suspension
- Speed sensitive power steering
- Lock-up transmission
- Front mounted engine
- Longitudinal mounted engine
- Aluminum engine block
- Aluminum cylinder head
- Overdrive transmission
- Powertrain type: ICE
- All-speed ABS and driveline traction control
- Electronic transfer case shift
- Independent front suspension
- Short and long arm front suspension
- Front anti-roll bar
- Front coil springs
- Rancho shock absorbers
- Rigid axle rear suspension
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Safety
- HD Rear Vision Camera w/Hitch View rear mounted camera
- Brake assist system
- Teen Driver restricted driving mode/alerts
- Immobilizer
- StabiliTrak w/Proactive Roll Avoidance electronic stability control system with anti-roll
- Hill Descent Control (HDC)
- Hill Start Assist (HSA)
- LED daytime running lights
- LED brake lights
- LED front fog lights
- Manual rear child safety door locks
- 6 airbags
- Driver front impact airbag
- Seat mounted side impact driver airbag
- Curtain first and second-row overhead airbags
- Passenger front impact airbag
- Seat mounted side impact front passenger airbag
- Airbag occupancy sensor
- Reflector headlights
- LED low and high beam headlights
- Auto on/off headlight control
- Delay-off headlights
- Remote activated perimeter approach lighting
- 4-wheel disc brakes
- 4-wheel antilock (ABS) brakes
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Entertainment
- Primary monitor touchscreen
- Bluetooth wireless audio streaming
- Premium GMC Infotainment System external memory control
- Internet radio capability
- GMC Infotainment System voice activated audio controls
- 2 total number of 1st row displays
- 8 inch primary display
- Seek scan
- Radio data system (RDS)
- Auxiliary input jack
- 3 month satellite trial subscription
- Fixed audio antenna
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Crash Safety Ratings
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OVERALL
4 STAR
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FRONT
4 STAR
SIDE
5 STAR
ROLLOVER
4 STAR
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Factory Warranty
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Powertrain warranty
60 month/100,000 miles (FLT)
*Confirm any warranty information with dealer before purchase.Corrosion perforation warranty
72 month/100,000 miles
*Confirm any warranty information with dealer before purchase.Roadside warranty
60 month/100,000 miles (FLT)
*Confirm any warranty information with dealer before purchase.
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Disclaimers
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Diehl Automotive utilizes a system that generates market value pricing automatically for new and pre-owned vehicles and may cause errors, inaccuracies, or omissions. Some aftermarket additions or accessories may not be displayed properly. For accuracy, please contact the dealer for real-time, accurate pricing. A documentation fee of $477 applies and is not included in the pricing. Tax, Title, and Tags are also not included and must be paid by the purchaser. Some prices may include manufacturer-to-dealer offers that are not compatible with manufacturer special finance programs and/or lease offers. While great effort is made to ensure the accuracy of the information on this site, errors do occur so please verify information with a customer service rep. This is easily done by calling us or by visiting us at the dealership.
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