GM Sigma platform
Sigma was General Motors' mid-size rear-wheel drive automobile platform. The architecture debuted in 2002 with the 2003 Cadillac CTS and is adaptable for all-wheel drive and extended wheelbase versions.
GM Sigma platform | |
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2010 Cadillac CTS Wagon | |
Overview | |
Manufacturer | Cadillac |
Parent company | General Motors |
Production | 2002-2015 |
Assembly |
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Body and chassis | |
Class | Mid-size car |
Layout | Front-engine, rear-wheel drive / all-wheel drive |
Body style(s) |
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Vehicles | |
Related | GM Zeta platform |
Powertrain | |
Engine(s) |
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Transmission(s) | |
Dimensions | |
Wheelbase |
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Length | 188.5–197.6 in (4,787.9–5,019.0 mm) |
Width | 70.6–74.1 in (1,793.2–1,882.1 mm) |
Height | 55.9–67.8 in (1,419.9–1,722.1 mm) |
Curb weight | 3,568–4,343 lb (1,618–1,970 kg) |
Chronology | |
Predecessor | GM V platform (RWD) |
Successor | GM Alpha platform |
The long-wheelbase Cadillac STS replaced the front-wheel drive GM G platform Cadillac Seville. The CTS was a replacement for the rear-wheel drive V-body Cadillac Catera.
The Sigma platform has a four-wheel independent suspension with control arms in front and multi-link in the rear. GM's High Feature V6 and Northstar V8 are most common, though the small-block V8 has also been used. GM's 5-speed 5L40/5L50 automatic transmission is used throughout the range.
All Sigma vehicles are built at the purpose-built Lansing Grand River factory in Lansing, Michigan.
Vehicles based on this platform:
- 2003-2007 Cadillac CTS
- 2004-2009 Cadillac SRX
- 2005–2011 Cadillac STS
- 2007–2013 Cadillac SLS (China)
Sigma II
The Sigma II platform debuted with the 2008 Cadillac CTS, and is larger and wider than its predecessor. However, it is more flexible; sharing more parts with the larger Zeta platform than it does with the Sigma I platform. Despite this parts sharing, Sigma II remains exclusive to Cadillac vehicles. For the 2011 model year coupé and station wagon body styles were introduced. Engines for this platform range from the High Feature V6 engine to the supercharged LSA V8 in the Cadillac CTS-V.
Applications:
- 2008–2013 Cadillac CTS
- 2009–2015 Cadillac CTS-V