GMC Sierra 2021 2500 HD 3500 HD Factory Workshop Service Repair Manual

Price range: $46.00 through $49.00

GMC Sierra 2021 2500 HD 3500 HD Factory Workshop Service Repair Manual

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Loaded with Hi Resolution illustrations, instructions, photos, and diagrams, complete to service and repair your GMC.

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SKU: N/A Categories: Cars, GMC, Sierra

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GMC Sierra 2021 2500 HD 3500 HD Factory Workshop Service Repair Manual

These are the same manuals used by professionals to diagnose and repair these models.

Loaded with illustrations, instructions, photos, and diagrams, complete to service and repair your vehicle.

CD COVER:

GMC Sierra 2500HD 3500HD 2021 Service Manual

SERVICE MANUAL COVER:

Engine

12 V Starting and Charging

Engine Controls and Fuel – 6.6L (L5P)

Engine Controls and Fuel – 6.6L (L8T)

Engine Controls Schematics

Engine Heating and Cooling

Engine Mechanical

Exhaust

Body Hardware and Trim

Exterior Trim

Floor Coverings and Headlinings

Instrument Panel and Console Trim

Interior Trim and Paneling

Body Repair

Bolted Exterior Body Panels and Closures

Bumpers and Fascias

Collision Repair

Frame and Underbody

Paint and Coatings

Body Systems

Horns and Pedestrian Alerts

Lighting

Lights Schematics

Mirrors

Vehicle Access

Wipers and Washers

Brakes

Antilock Brake System

Disc Brakes

Hydraulic Brakes

Park Brake

Diagnostic Overview, Starting Point, and Programming

Driveline and Axle

Wheel Drive Shafts

Driver Information and Entertainment

Active Noise Cancellation

Cellular, Entertainment, and Navigation

Radio|Navigation System Schematics

Displays and Gauges

Instrument Cluster Schematics

Image Display Cameras

General Information

Air|Wind Noise

Maintenance and Lubrication

Vibration Diagnosis and Correction

Waterleaks

HVAC

Heating, Ventilation, and Air Conditioning

Preface

Dangers, Warnings, and Cautions

Roof

Removable Top

Safety and Security

Driver Assistance Systems

Immobilizer

Parking Assistance Systems

Remote Functions

Seat Belts

Supplemental Restraints

Theft Deterrent

Seats

Seat Hardware, Trim, and Upholstery

Seat Heating and Cooling

Steering

Power Steering

Steering Wheel and Column

Suspension

Front Suspension

Rear Suspension

Suspension General Diagnosis

Tire Pressure Monitoring

Tires and Wheels

Wheel Alignment

Transmission

Automatic Transmission

Electronic Transmission Range Select

Transmission Cooling

This manual is the same as the manual used by workshops. Service Manual contains detailed instructions and step by step diagrams for all workshop procedures.

Language: English
Format: PDF

COMPATIBLE WITH ALL WINDOWS & MAC COMPUTERS
(WINDOWS 11, WINDOWS 10, WINDOWS 8 ETC.)

Windows/Mac/Tablet/Phone Friendly

The 2021 GMC Sierra 2500 HD and 3500 HD models offer robust performance and heavy-duty towing and hauling capacities, with differences primarily focused on maximum capability. Both models feature the option of a powerful 6.6L Duramax turbo-diesel V8 engine paired with an Allison 10-speed automatic transmission.

Engine options

Both the 2500 HD and 3500 HD are available with two engine choices:

6.6L V8 Gasoline Engine

: This standard engine is paired with a 6-speed automatic transmission and produces 401 horsepower and 464 lb-ft of torque.
6.6L Duramax Turbo-Diesel V8

: Available on all trims except the base Pro, this engine delivers 445 horsepower and 910 lb-ft of torque. It is paired with an Allison 10-speed automatic transmission.

Capability differences

While the engine options are the same, the 2500 HD and 3500 HD are built for different levels of work, with the 3500 HD offering significantly higher maximum payload and towing capacities.

Feature	2021 GMC Sierra 2500 HD	2021 GMC Sierra 3500 HD
Max Payload	3,979 lbs	Up to 7,442 lbs with a Regular Cab, 2WD, Long Box, and dual rear wheels (DRW)
Max Conventional Towing	18,500 lbs (diesel, properly equipped)	Up to 20,000 lbs (diesel)
Max 5th Wheel Towing	18,510 lbs (diesel, properly equipped)	Up to 36,000 lbs with a dual rear wheel (DRW), diesel configuration

New features for 2021

Since the heavy-duty Sierra models were all-new for 2020, updates for the 2021 model year focused on enhancing available features:

MultiPro Tailgate: Became standard on SLE trim and above.
Wireless Connectivity: Wireless Apple CarPlay and Android Auto became standard on SLT trims and higher.
Trailer Technology: Enhanced trailer tech was added, including a jack-knife alert.
Camera Systems: The top-of-the-line Denali trim gained extensive camera systems as a standard feature.

Notable trims

AT4

: This trim is equipped with off-road suspension, Rancho shock absorbers, skid plates, and an automatic locking rear differential.
Denali

: The luxury trim includes chrome accents, 20-inch wheels, leather upholstery, and standard tech features like extensive camera systems and a Bose audio system. A

Denali Black Diamond Edition

was a new, high-end package for 2021.

Common issues and recalls

When buying a used 2021 model, consider the following potential problems and recalls:

Powertrain Issues: Some owners have reported issues with delayed shifting and even transmission failure. Some diesel models were also recalled for a faulty transmission control valve.
Brakes: Recalls were issued for 2021-2022 models for bolts on the brake pressure modulator valve that were not properly tightened, which could increase the risk of fire.
DEF Tank Problems: Owners of diesel models have reported issues with the Diesel Exhaust Fluid (DEF) tank and heater failing.
Infotainment Glitches: Common electrical problems reported include the infotainment screen freezing or a lack of audio for the radio and turn signals.
Tailgate Recall: Certain 2021-2024 models with power-unlatching tailgates were recalled due to a switch that could short circuit and cause the tailgate to open while in park.