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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.


The 2001 GMC Sierra belongs to the GMT800 Sierra generation, built for model years 1999–2006. Most procedures are shared with the other years of this generation, but engines, options and wiring changed from year to year, so the manual is made for the 2001 model year.
Check the model year on your VIN: on a 2001 vehicle the 10th character of the 17-digit VIN is “1”. 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 25 years old, a 2001 vehicle is in the age range where wiring, rubber hoses, seals and corrosion repairs take most of the work, and where original factory information is hardest to find.
Same generation: 2000 GMC Sierra, 2002 GMC Sierra, 2003 GMC Sierra, 2004 GMC Sierra, 2005 GMC Sierra, 2006 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
Engine
4.3L
4.8L
5.3L
6.0L
6.6L
8.1L
Transmission
Automatic Transmission - 4L60-E
Automatic Transmission - 4L80-E
Automatic Transmission - Allison
Manual Transmission - NV 3500
Manual Transmission - NV 4500
Manual Transmission - ZF S6-650
