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We cover three LaCrosse generations. The first (2005 to 2009) uses 3.8- and 3.6-liter V6 engines. The second (2010 to 2016) offers a 2.4-liter with eAssist mild hybrid and a 3.6 V6. The third (2017 to 2019) uses a 3.6 V6 with an 8- or 9-speed automatic.


The 2005 Buick LaCrosse belongs to the first-generation LaCrosse, built for model years 2005–2009. It is the first model year of this generation: the platform, wiring and many procedures changed compared with the previous model, so a manual for an earlier year will not match it.
Check the model year on your VIN: on a 2005 vehicle the 10th character of the 17-digit VIN is “5”. 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 21 years old, a 2005 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: 2006 Buick LaCrosse, 2007 Buick LaCrosse, 2008 Buick LaCrosse, 2009 Buick LaCrosse.
All Buick LaCrosse model years: 2005 · 2006 · 2007 · 2008 · 2009 · 2010 · 2011 · 2012 · 2013 · 2014 · 2015 · 2016 · 2017 · 2018 · 2019
Engine
3.6L (LY7)
3.8L
Transmission
Automatic Transaxle - 4T65-E
