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Haynes

GMC Sierra 2500/3500 (2020-2024) Haynes Repair Manual

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  • The latest version of our print manual

Description

Built for heavy-duty towing, hauling, and tough jobsite demands, the GMC Sierra 2500 and 3500 (2020–2024) deliver serious power and durability. Keep your truck running like new with the Haynes Repair Manual, your step-by-step guide to maintenance and repairs written specifically for these heavy-duty pickups.

Expert Guidance You Can Trust

Every Haynes manual is based on hands-on strip-downs and rebuilds by our expert editorial team. Inside, you’ll find clear instructions, torque specifications, detailed illustrations, and pro tips. Giving you the confidence to tackle repairs efficiently and save money compared to dealership costs.

Models Covered
  • GMC Sierra 2500HD / 3500HD (2020–2024)
    • 6.6L V8 turbo-diesel Duramax (L5P)
    • 6.6L V8 gasoline (L8T) - Online only
Common GMC Sierra 2500/3500 Issues (and How This Manual Helps)
  • Duramax DEF system warning lights – Diagnosis and SCR component replacements after ~60k miles
  • Turbocharger performance drops – Inspection, troubleshooting, and replacement guidance from ~80k miles
  • Transmission shifting delays (Allison automatics) – Fluid service procedures and fault checks for 50k+ miles
  • Suspension wear and steering play – Step-by-step bushing, tie-rod, and ball joint replacements
  • Brake system servicing – Rotor and pad changes plus ABS sensor diagnostics covered in detail
  • Cooling system leaks – Water pump and radiator replacement to prevent overheating under load
Driving Habits That Impact Maintenance
  • Snow plowing and rough terrain: Accelerated suspension wear—manual includes full component replacement procedures.
  • Frequent towing: Increased stress on brakes and turbo—detailed brake servicing and boost system repairs included.
  • High mileage driving: Regular fluid changes and cooling system checks—full service intervals and troubleshooting flowcharts inside.
  • Older, high-mileage Sierra: Timing chain wear and ABS sensor failures—covered with clear, step-by-step repair instructions.
What’s Inside the Haynes Repair Manual
  • Comprehensive repair and rebuild procedures with factory torque settings
  • Maintenance schedules, service intervals, and fluid charts tailored to Sierra HD models
  • Troubleshooting flowcharts for DEF, drivetrain, electrical, and cooling systems
  • Full coverage of brakes, suspension, steering, HVAC, bodywork, and wiring
  • Hybrid format: printed manual plus convenient online access included

Whether you’re replacing brake pads, diagnosing the Duramax system, or maintaining heavy-duty suspension components, the GMC Sierra 2500/3500 (2020–2024) Haynes Repair Manual equips you with the knowledge to do the job right the first time.

More Information

  • Coverage

    Models Covered

    Includes

    • In the book: 6.6L L5P diesel
    • Online: 6.6L V8 L8T gasoline

    Note: Gasoline engine details online only

  • Exclusions

    Please note that gasoline detail is an online only feature.

Benefits

  • Tailored to Your Car, No Guesswork
    Stop searching forums - get trusted guidance made just for your vehicle

    Tailored to Your Car, No Guesswork

    Straight Answers for Your Make and Model

    When you're working on your car, the last thing you need is conflicting advice or vague online videos. This manual takes the guesswork out of DIY with clear, accurate guidance that's specific to your exact make and model.

    Everything is checked, double-checked and triple-checked by Haynes' experts, and written in plain, easy-to-understand language that's ideal for first-time and more experienced DIYers alike.

  • Outsmart Repairs with Regular Maintenance
    Learn how to service smarter for a longer-lasting, more reliable ride

    Outsmart Repairs with Regular Maintenance

    Keep It Running, Keep It Yours

    Regular maintenance is one of the most effective ways to prevent an unexpected breakdown and unwanted trips to the mechanic. By keeping your car's vital systems, like brakes, cooling, and engine in good condition you'll be able to catch small issues before they become big problems.

    This guide takes you through essential tasks like oil changes, fluids checks and best inspections to help ensure your vehicle runs smoothly, reliably and safely.

  • Why Pay The Shop? Learn to Fix It Yourself
    Save money and skip the mechanic by learning to do-it-yourself

    Why Pay The Shop? Learn to Fix It Yourself

    Why Pay a Mechanic for Something You Can Do Yourself?

    With the right know-how and tools, it's easier than you think - and this Haynes manual shows you how. Inside and with bonus online content, you'll learn the essential techniques, tips and tools to handle maintenance and repairs the right way. You'll also get trusted, accurate info on torque settings, lubricants, tire pressures and more, so you can work safely and with confidence every step of the way.

  • Everything You Need, All In One Guide
    Packed with clear instructions, detailed photos and easy-to-follow diagrams

    Everything You Need, All In One Guide

    From Oil Changes to Engine Repairs - You've Got This

    This guide has everything you need to take care of your car's maintenance and repair. With clear step-by-step instructions, detailed photos and easy-to-follow diagrams, you'll learn how to handle all essential work, from routine servicing to major repairs, installations and removals.

    For over 60 years, Haynes has been the go-to name in automotive repair. Trusted by DIYers and enthusiasts alike, our guides are built on decades of hands-on experience and expert knowledge, so you can be sure you're getting the right information, right when you need it.

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    Customer Testimonials

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