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Sierra

GMC Sierra

1988–now

Generations

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Sierra (GMT400)

1988–1998

Code: GMT400
Years: 1988–1998
Trims covered: 0

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Sierra (GMT800)

1999–2006

Code: GMT800
Years: 1999–2006
Trims covered: 0

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Sierra (GMT900)

2007–2013

Code: GMT900
Years: 2007–2013
Trims covered: 0

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Sierra (K2XX)

2014–2018

Code: K2XX
Years: 2014–2018
Trims covered: 0

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Sierra (T1XX)

2019–2026

Code: T1XX
Years: 2019–2026
Trims covered: 0

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Sierra (5th generation)

2027–now

Years: 2027–now
Trims covered: 0

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Last updated 7 November 2026

Factory specs for every car since 1990, with the source behind each number.

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About the data

Data: Wikidata (CC0), NHTSA vPIC, EPA fueleconomy.gov, EEA. Photos: Wikimedia Commons, credited under each image.

Values marked “Unverified” come from AI knowledge and have not been checked against a source.