Home
GMC
GMC Sierra 1500 Diesel

GMC Sierra 1500 Diesel

Q: What engine does the 2026 AT4 Diesel use?

The 2026 AT4 Diesel is powered by a 3.0-liter inline-6 turbo diesel engine that produces 305 horsepower and 495 lb-ft of torque , delivering strong pulling power and smooth highway performance.

Q: How fuel-efficient is the 2026 AT4 Diesel?

This truck has an EPA-estimated 22 MPG in the city and 26 MPG on the highway , with a combined rating of 24 MPG , which is competitive for a full-size diesel pickup.

Q: What is the towing capacity of the 2026 AT4 Diesel?

The truck can tow up to 9,000 pounds , making it suitable for hauling trailers, boats, or work equipment.

$66,800
Brand: GMC
Category: Car's
Add to Compare

Available Official

Fuel Type Diesel
Engine Power 305 hp
Seat 5 seats
Top Speed 177 km/h
Transmission automatic

Full Specifications

Overview

Models Car models are the different versions or designs of cars made by a manufacturer, each with unique features, styles, and configurations.	AT4 Diesel
Year typically refers to the model year of a vehicle, which indicates its design and production cycle rather than the actual manufacturing date.	2026
Combined MPG Combined MPG is the average number of miles a vehicle can travel per gallon of fuel, calculated by blending city and highway driving figures.	24 MPG
Drive Type A car's drive type refers to which wheels receive power from the engine. For example, front-wheel drive (FWD) powers the front wheels, rear-wheel drive (RWD) powers the rear, and all-wheel drive (AWD) or four-wheel drive (4WD) power all four wheels.	four wheel drive
Total Seating Car total seating refers to the maximum number of passengers a car can accommodate, including the driver.	5
Bed length	69.9 in.
Curb Weight Car curb weight is the weight of a vehicle with all standard equipment, fluids, and a full tank of fuel, but without passengers or cargo.	5,500 lbs.
Basic Warranty A Basic Warranty is a manufacturer’s promise to repair or replace parts of a product if they prove defective within a specified period.	3 yr./ 36,000 mi.
Towing Capacity	9,000 lbs.
Payload Capacity	1,670 lbs.
Dealerships Car dealerships are businesses that sell new or used vehicles directly to consumers, often providing financing, trade-ins, and maintenance services.	Tampa, FL 33614, United States

Fuel & MPG / Battery & Range

Fuel type Fuel type refers to the kind of energy source used to power an engine or appliance, such as gasoline, diesel, electricity, or alternative fuels.	Diesel fuel
EPA city/highway MPG EPA city/highway MPG refers to the estimated miles per gallon a car gets in city driving and on highways, as measured by the U.S. Environmental Protection Agency.	22/26 MPG
EPA combined MPG EPA combined MPG stands for Environmental Protection Agency Combined Miles per Gallon. It estimates a vehicle’s fuel efficiency by averaging its performance in both city and highway driving conditions.	24 MPG
Range in miles (city/hwy) Car range refers to the distance a vehicle can travel on a full tank of fuel (or a full battery charge) and is usually measured separately for city driving—which often gives a lower range due to stop-and-go traffic—and highway driving, where steady speeds generally result in a higher range.	528.0/624.0 mi.
Fuel tank capacity A car's fuel tank capacity is the maximum amount of fuel it can hold, usually measured in liters or gallons.	24.0 gal.
CO2 Emissions Car CO₂ emissions refer to the amount of carbon dioxide released into the atmosphere by a vehicle’s engine as it burns fuel.	7.1 tons

Engine

Base engine size The car’s base engine size usually refers to its engine displacement, which is the total volume of all the cylinders (measured in liters or cubic centimeters).	3.0 L
Cylinders Car cylinders are the chambers in an engine where the combustion of fuel occurs, driving pistons to create mechanical power.	Inline 6
Base engine type A car’s base engine type refers to its fundamental design—typically the configuration (like inline, V-type, or boxer) and the fuel it uses (gasoline, diesel, etc.).	Diesel
Horsepower Car horsepower is a unit of power that measures how much work an engine can perform, with one horsepower roughly equal to 746 watts.	305 hp @ 3,750 rpm
Torque Car torque is a measure of the engine's twisting force, indicating its ability to accelerate the vehicle and overcome resistance.	495 lb-ft @ 2,750 rpm
Valves Car valves are engine components that control the intake of air and fuel and the exhaust of combustion gases.	24
Cam type generally refers to the configuration of an engine’s camshaft(s). For example, engines can have a single overhead cam (SOHC) or dual overhead cam (DOHC) layout, each affecting valve timing and engine performance differently.	Double overhead cam (DOHC)
Valve timing Valve timing is the process of precisely controlling when the engine's intake and exhaust valves open and close to optimize performance and efficiency.	Variable
Direct injection Direct injection is a fuel system that injects fuel directly into the engine’s combustion chamber, which improves efficiency, power, and fuel economy.	Standard

Towing & Hauling

Max Towing Capacity	9,000 lbs.
Max Payload Capacity	1,670 lbs.

Drivetrain

Transmission A car transmission is the system that transfers power from the engine to the wheels, using different gear ratios to control speed and torque.	10-speed shiftable automatic
Drive Type A car's drive type refers to which wheels receive power from the engine. For example, front-wheel drive (FWD) powers the front wheels, rear-wheel drive (RWD) powers the rear, and all-wheel drive (AWD) or four-wheel drive (4WD) power all four wheels.	Four wheel drive
Descent control	Standard
Center limited slip differential	Standard

Suspension

Four-wheel independent suspension	Standard
Front and rear stabilizer bar	Standard

Dimensions

Length	232.9 in.
Overall width with mirrors	81.2 in.
Height	Standard
Wheelbase A car's wheelbase is the distance between the centers of its front and rear wheels.	148.0 in.
Maximum payload	1,670 lbs.
Turning circle The car turning circle is the smallest circular path a vehicle can complete, reflecting its maneuverability.	47.3 ft.
Ground clearance he distance from the lowest part of the car to the ground. This measurement is important because it determines how well a car can handle rough or uneven terrain.	11.1 in.
Curb Weight Car curb weight is the weight of a vehicle with all standard equipment, fluids, and a full tank of fuel, but without passengers or cargo.	5,500 lbs.
Maximum towing capacity	9,000 lbs.
Gross weight Car gross weight is the total weight of the vehicle including passengers, cargo, fuel, and all additional equipment.	7,000 lbs.
Country of final assembly A car’s country of final assembly is the nation where the vehicle is put together into its final form, regardless of where its parts were produced.	Mexico/United States

Front Seat Dimensions

Leatherette	Standard
Front head room	43.0 in.
Front leg room	44.5 in.
Front shoulder room	64.5 in.
Front hip room	60.8 in.
Bucket front seats	Standard
8-way power driver seat	Standard
Driver seat with power adjustable lumbar support	Standard
2 memorized driver seat settings	Standard
6-way power passenger seat	Standard
Height adjustable passenger seat	Standard
Passenger seat with power adjustable lumbar support	Standard
Multi-level heated driver seat	Standard
Multi-level heated passenger seat	Standard

Rear Seat Dimensions

Rear head room	40.1 in.
Rear leg room	43.4 in.
Rear shoulder room	64.0 in.
Rear hip room	59.2 in.
Folding center armrest	Standard
Split-folding rear seatback	Standard

In-Car Entertainment

Display size	13.4"
Total speakers	7
AM/FM stereo	Standard
Surround audio surround audio (discrete)	Standard
Android Auto/Apple CarPlay	Standard
USB connection	Standard
USB with external media control	Standard
Satellite radio satellite radio	Standard
3 months of provided satellite radio service	Standard

Power Feature

4 one-touch power windows	Standard
Hands-free entry	Standard
Heated mirrors	Standard

Instrumentation

Trip computer	Standard
Compass	Standard
Tachometer	Standard
External temperature display	Standard
Clock	Standard

Tires & Wheels

Painted alloy wheels	Standard
Tires Size	275/60R20
Wheels Size	20 x 9.0
Fullsize matching spare tire	Standard
Inside mounted spare tire	Standard
Underbody mounted spare tire	Standard

Telematics

Emergency Service	Standard
Airbag Deployment Notification	Standard
Vehicle Alarm notification	Standard
Stolen Vehicle Tracking/Assistance	Standard
Roadside Assistance	Standard

Warranty

Basic	3 yr./ 36,000 mi.
Drivetrain	5 yr./ 100,000 mi.
Rust	6 yr./ 100,000 mi.
Roadside Assistance	5 yr./ 60,000 mi.
Free maintenance	1 yr./ unlimited mi.

Disclaimer

We do not guarantee that the information of this page is 100% accurate and up to date. Learn more...

Our Rating

The overall rating is based on review by our experts

4.4

Design 4 / 10
Engine 5 / 10
Exterior Equipment 4 / 10
GPS 4 / 10
Performance 4 / 10
Price 5 / 10
Technology 5 / 10

PROS

Strong diesel performance with high torque for towing, hauling, and off-road driving.

CONS

Large size and turning circle (47.3 ft) may make parking and city driving challenging.

The 2026 GMC Sierra 1500 Diesel AT4 pickup delivers a powerful mix of performance, capability, and efficiency with its 3.0-liter inline-6 diesel engine producing 305 hp and 495 lb-ft of torque. Paired with a 10-speed automatic transmission and four-wheel drive, it achieves an estimated 24 MPG combined while offering a strong 9,000-lb towing capacity and 1,670-lb payload. With seating for five, a 69.9-inch bed, 11.1-inch ground clearance, and advanced features like descent control and a limited-slip differential, this rugged truck is built for both daily driving and demanding off-road or hauling tasks.

Your question is: GMC Sierra 1500 Diesel AT4?

Which question will you have about this car? Let’s justify these. There, we are including the major questions and answers about this car. So, let’s start now.

What engine does the 2026 AT4 Diesel use?

The 2026 AT4 Diesel is powered by a 3.0-liter inline-6 turbo diesel engine that produces 305 horsepower and 495 lb-ft of torque, delivering strong pulling power and smooth highway performance.

How fuel-efficient is the 2026 AT4 Diesel?

This truck has an EPA-estimated 22 MPG in the city and 26 MPG on the highway, with a combined rating of 24 MPG, which is competitive for a full-size diesel pickup.

What is the towing capacity of the 2026 AT4 Diesel?

The truck can tow up to 9,000 pounds, making it suitable for hauling trailers, boats, or work equipment.

Give Your Reviews or comments

Be the first to add a Review

Please post a user review only if you have / had this product.
Your Name *
Your Email *
Review Title *
Review Text *
Rate this Product
Design: What do you feel about Design and build quality of this device?

4
Engine: What about battery life, while calling, listening music, watching videos, playing games and doing other tasks.

5
Exterior Equipment:

4
GPS: When you call someone, what is the voice quality you hear or vice versa, is speakerproduct working good during calls.

4
Performance: Is this device perform good while watching videos, playing games, taking snapshots, browsing internet and navigate through other applications?

4
Price: What do you feel about the features of this device, is these enough for you in everyday life?

5
Technology:

5
Average Rating 6 / 10 based on your selection