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2018 GMC Sierra repair manual

2018 GMC Sierra repair manual

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  • 2018 GMC Sierra repair manual & wiring diagrams.
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2018 GMC Sierra - OEM Factory Repair Manual

Get the manufacturer’s repair information for your 2018 GMC Sierra, including factory service procedures, diagnostics, technical illustrations, and wiring diagrams—all in a convenient digital manual.  Understand your vehicle. Approach repairs with confidence.

About the GMC Sierra

We cover the Sierra from 2000 to 2023, built alongside the Silverado. Engines range from the 4.3-liter V6 and 4.8- to 6.2-liter V8s to the 6.6- and 3.0-liter Duramax diesels, with Denali trims and up to a 10-speed automatic.

Whether you’re doing the job yourself or discussing repairs with your mechanic, this manual shows you exactly how the work is done, so you can make the right decisions. This manual covers the 2018 GMC Sierra specifically, keeping the information focused on your vehicle’s model and year, no matter what version you have:
  • 1500 Base, 2WD
  • 1500 Base, 4WD
  • 1500 Denali, 2WD
  • 1500 Denali, 4WD
  • 1500 SLE, 2WD
  • 1500 SLE, 4WD
  • 1500 SLT, 2WD
  • 1500 SLT, 4WD
  • 2500HD Base, 2WD
  • 2500HD Base, 4WD
  • 2500HD Denali, 2WD
  • 2500HD Denali, 4WD
  • 2500HD SLE, 2WD
  • 2500HD SLE, 4WD
  • 2500HD SLT, 2WD
  • 2500HD SLT, 4WD
  • 3500HD Base, 2WD
  • 3500HD Base, 4WD
  • 3500HD Denali, 2WD
  • 3500HD Denali, 4WD
  • 3500HD SLE, 2WD
  • 3500HD SLE, 4WD
  • 3500HD SLT, 2WD
  • 3500HD SLT, 4WD
Factory information you can put to work
Sourced from the manufacturer’s official technical information website, the manual helps you:
  • Review repair procedures before starting a job (from routine maintenance to major repairs)
  • Understand component layouts with technical illustrations (procedures are explained step by step)
  • Follow electrical connections using wiring diagrams.
  • Plan your work and discuss recommended repairs with your mechanic (or double-check a quote)
Illustrations and diagrams retain the original image quality supplied by the manufacturer. Diagrams stay sharp and readable, even when you zoom in.
Permanent ownership with no recurring subscription fees—the manual is yours to keep.
Order, download, and get started.
You can download your manual immediately after payment. We create an account automatically when you order, giving you direct access to your file through our website.
This is a digital product, easy to use on any PC, laptop, MacBook, or even phone. No printed book or physical disc is shipped.
See what’s inside
Explore the screenshots below for examples of the manual’s layout, technical information, and image detail.
Wiring Diagrams sample:
4_-_copy_669_01
Repair Manual sample:
3_-_copy_687
Instant download your 2018 GMC Sierra OEM Factory Repair Manual—you can start your repairs in minutes.

About the 2018 GMC Sierra

Your 2018 GMC Sierra is from the K2XX Sierra generation, which covers model years 2014–2018. It is the last model year of this generation and includes the running changes made during production, which is why a manual for the exact year matters.

Check the model year on your VIN: on a 2018 vehicle the 10th character of the 17-digit VIN is “J”. Vehicles built for North America always carry the model year in that position; on some European or Australian vehicles it may be left unused, so in that case go by the registration papers or the build plate.

At about 8 years old, a 2018 vehicle is usually past its basic warranty. Typical jobs at this age are brakes, suspension parts, fluids, the 12V battery and diagnosing sensor faults with the factory wiring diagrams.

Same generation: 2014 GMC Sierra, 2015 GMC Sierra, 2016 GMC Sierra, 2017 GMC Sierra.

All GMC Sierra model years: 2000 · 2001 · 2002 · 2003 · 2004 · 2005 · 2006 · 2007 · 2008 · 2009 · 2010 · 2011 · 2012 · 2013 · 2014 · 2015 · 2016 · 2017 · 2018 · 2019 · 2020 · 2021 · 2022 · 2023



  • 1500 Base, 2WD
  • 1500 Base, 4WD
  • 1500 Denali, 2WD
  • 1500 Denali, 4WD
  • 1500 SLE, 2WD
  • 1500 SLE, 4WD
  • 1500 SLT, 2WD
  • 1500 SLT, 4WD
  • 2500HD Base, 2WD
  • 2500HD Base, 4WD
  • 2500HD Denali, 2WD
  • 2500HD Denali, 4WD
  • 2500HD SLE, 2WD
  • 2500HD SLE, 4WD
  • 2500HD SLT, 2WD
  • 2500HD SLT, 4WD
  • 3500HD Base, 2WD
  • 3500HD Base, 4WD
  • 3500HD Denali, 2WD
  • 3500HD Denali, 4WD
  • 3500HD SLE, 2WD
  • 3500HD SLE, 4WD
  • 3500HD SLT, 2WD
  • 3500HD SLT, 4WD

4.3L V6

5.3L V8

6.2L V8

6.0L V8

6.6L V8 Turbo Diesel Duramax



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2018 GMC Sierra repair manual$29.99
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