Certified 2021 Gmc Sierra 1500 AT4

$37,999

Financing as low as $621 per month.

Key Features

Mileage

63,324

Drivetrain

4WD

Engine

3L I6 DOHC Turbo

Transmission

10 Speed Automatic

Fuel Type

Diesel

MPG

16 / 21

Color

Satin Steel Metallic / Jet Black With Kalahari Accents

Title

Clean

Contact Seller

Au

AutoFair Ford

1475 South Willow St.

Manchester, NH 03103

By submitting this form, you agree to be contacted by the seller.

Dealer Description

The 2021 GMC Sierra 1500 AT4 in Satin Steel Metallic is a rugged and capable full-size pickup, powered by a 3.0L I6 Duramax Diesel engine and equipped with 4WD. This Carfax One-Owner truck combines impressive torque, fuel efficiency (22/26 MPG city/highway), and proven longevity, making it ideal for towing, hauling, and long-term ownership. The AT4 Preferred Package adds Off-Road Suspension, Auto-Locking Rear Differential, Hill Descent Control, and Red Recovery Hooks, while exterior features like a Body-Color Surround Grille, 20" Machined Aluminum Wheels, Deep-Tinted Glass, and a spray-on AT4 bedliner deliver both style and functionality. The ProGrade Trailering System, Integrated Trailer Brake Controller, Hitch Guidance with Hitch View, and multiple 120-volt power outlets ensure its ready for serious work or adventure. Inside, the Sierra AT4 offers a tech-forward and comfortable cabin with heated and ventilated front seats, heated rear seats, heated steering wheel, Bose premium audio, wireless charging, and SiriusXM with 360L. Advanced features like Keyless Open & Start, navigation-enabled GMC Infotainment System, OnStar & GMC Connected Services, rear USB charging ports, and a power sliding rear window enhance convenience and connectivity. AutoFair Certified, this truck comes with a 3-year/125,000-mile warranty, a Clean Carfax, and an odometer over 22,000 miles below market average. With its combination of fuel-efficient diesel power, off-road capability, and proven durability, the Sierra 1500 AT4 is a versatile and long-lasting pickup built for both work and play.

Features & Options

  • Off-Road Suspension
  • Auto-Locking Rear Differential
  • Hill Descent Control
  • Red Recovery Hooks
  • Body-Color Surround Grille
  • 20" Machined Aluminum Wheels
  • Deep-Tinted Glass
  • Spray-On Pickup Bed Liner w/AT4 Logo
  • ProGrade Trailering System
  • Integrated Trailer Brake Controller
  • Hitch Guidance with Hitch View
  • Multiple 120-volt power outlets
  • Heated and Ventilated Front Seats
  • Heated Rear Seats
  • Heated Steering Wheel
  • Bose Premium Audio
  • Wireless Charging
  • SiriusXM with 360L
  • Keyless Open & Start
  • Navigation-enabled GMC Infotainment System
  • OnStar & GMC Connected Services Capable

Vehicle History Report

VIN: 3GTU9EETXMG404450

Check this vehicle's history for accidents, service records, ownership, and more.

Seller Details

Listed 12/13/2025

View original listing
Au

AutoFair Ford

1475 South Willow St.

Manchester, NH 03103

Phone

833-501-0323

Location

Contact Seller

Au

AutoFair Ford

1475 South Willow St.

Manchester, NH 03103

By submitting this form, you agree to be contacted by the seller.

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