View source for Engineering:GM Sigma platform

{{main|Engineering:List of GM platforms}}
{{Infobox automobile platform
| name           = GM Sigma platform
| image          = 2010 Cadillac CTS wagon--DC.jpg
| caption        = 2010 Cadillac CTS Wagon
| manufacturer   = [[Company:Cadillac|Cadillac]]
| parent_company = [[Company:General Motors|General Motors]]
| aka            = 
| production     = 2002-2015
| assembly       = {{ubl | China: Shanghai (Shanghai GM)| Russia: Kaliningrad, Kaliningrad Oblast (Avtotor)| United States: Lansing, Michigan (Lansing Grand River)}}
| class          = [[Engineering:Mid-size car|Mid-size car]] 
| layout         = [[Engineering:Front-engine, rear-wheel-drive layout|Front-engine, rear-wheel drive]] / [[Engineering:All-wheel drive|all-wheel drive]]
| body_style     = {{ubl | 2-door [[Engineering:Coupé|coupé]] | 4-door [[Engineering:Sedan (automobile)|sedan]] | 5-door [[Engineering:Station wagon|station wagon]] | 5-door [[Engineering:Sport utility vehicle|sport utility vehicle]] }}
| vehicles       = {{ubl | [[Engineering:Cadillac CTS|Cadillac CTS]] | [[Engineering:Cadillac SRX#First generation .282004.E2.80.932009.29|Cadillac SRX]] | [[Engineering:Cadillac STS|Cadillac STS]] }}
| related        = [[Engineering:GM Zeta platform|GM Zeta platform]]
| engine         = {{ubl |
2.6 L ''LY9'' V6 ([[Chemistry:Gasoline|gasoline]])|
2.8 L ''LP1'' V6 (gasoline)|
3.0 L ''LF1'' V6 (gasoline)|
3.0 L ''LFW'' V6 (gasoline)|
3.2 L ''LA3'' V6 (gasoline)|
3.6 L ''LY7'' V6 (gasoline)|
3.6 L ''LLT'' V6 (gasoline)|
3.6 L ''LFX'' V6 (gasoline)|
4.4 L ''LC3'' V8 ([[Engineering:Supercharger|supercharged]] gasoline)|
4.6 L ''LH2'' V8 (gasoline)|
5.7 L ''LS6'' V8 (gasoline)|
6.0 L ''LS2'' V8 (gasoline)|
6.2 L ''LSA'' V8 (supercharged gasoline)}}
| transmission   = {{ubl |
5-speed [[Company:Getrag|Getrag]] ''[[Engineering:Getrag 260 transmission|260]]'' manual|
5-speed GM ''[[Engineering:GM 5L40-E transmission|5L40-E]]'' automatic|
5-speed GM ''[[Engineering:GM 5L40-E transmission#5L50|5L50]]'' automatic|
6-speed [[Company:Aisin|Aisin]] ''[[Engineering:Aisin AY transmission|AY-6]]'' manual|
6-speed GM ''[[Engineering:GM 6L50 transmission|6L50]]'' automatic|
6-speed GM ''[[Engineering:GM 6L80 transmission|6L80]]'' automatic|
6-speed GM ''[[Engineering:GM 6L80 transmission|6L90]]'' automatic|
6-speed Tremec ''[[Engineering:Borg-Warner T-56 transmission|T-56]]'' manual|
6-speed Tremec ''[[Engineering:Tremec TR-6060 transmission|TR-6060]]'' manual}}
| wheelbase      = {{ubl | {{convert|113.4|in|mm|1|abbr=on}} | {{convert|116.4|in|mm|1|abbr=on}}}}
| length         = {{convert|188.5|-|197.6|in|mm|1|abbr=on}}
| width          = {{convert|70.6|-|74.1|in|mm|1|abbr=on}}
| height         = {{convert|55.9|-|67.8|in|mm|1|abbr=on}}
| weight         = {{convert|3568|-|4343|lb|kg|0|abbr=on}}
| predecessor    = GM V platform (RWD)
| successor      = [[Engineering:GM Alpha platform|GM Alpha platform]]
}}

'''Sigma''' was General Motors' [[Engineering:Mid-size car|mid-size]] [[Engineering:Rear-wheel drive|rear-wheel drive]] [[Engineering:Automobile platform|automobile platform]]. The architecture debuted in 2002 with the 2003 [[Engineering:Cadillac CTS|Cadillac CTS]] and is adaptable for [[Engineering:All-wheel drive|all-wheel drive]] and extended [[Physics:Wheelbase|wheelbase]] versions.

The long-wheelbase [[Engineering:Cadillac STS|Cadillac STS]] replaced the [[Engineering:Front-wheel drive|front-wheel drive]] GM G platform [[Engineering:Cadillac Seville|Cadillac Seville]]. The CTS was a replacement for the [[Engineering:Rear-wheel drive|rear-wheel drive]] V-body [[Engineering:Cadillac Catera|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 [[Engineering:Automatic transmission|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 [[Engineering:Cadillac CTS|Cadillac CTS]] 
* 2004-2009 [[Engineering:Cadillac SRX|Cadillac SRX]] 
* 2005–2011 [[Engineering:Cadillac STS|Cadillac STS]]
* 2007–2013 Cadillac SLS (China)

==Sigma II==
The '''Sigma II''' platform debuted with the 2008 [[Engineering:Cadillac CTS#3|Cadillac CTS]], and is larger and wider than its predecessor. However, it is more flexible; sharing more parts with the larger [[Engineering:GM Zeta platform|Zeta platform]] than it does with the '''Sigma I''' platform. Despite this parts sharing, '''Sigma II''' remains exclusive to [[Company:Cadillac|Cadillac]] vehicles. For the 2011 model year [[Engineering:Coupé|coupé]] and [[Engineering:Station wagon|station wagon]] body styles were introduced. Engines for this platform range from the High Feature V6 engine to the supercharged LSA V8 in the [[Engineering:Cadillac CTS-V|Cadillac CTS-V]].
 
Applications:
* 2008–2013 [[Engineering:Cadillac CTS#3|Cadillac CTS]] 
* 2009–2015 [[Engineering:Cadillac CTS-V#3|Cadillac CTS-V]] 


[[Category:General Motors platforms|Sigma]]

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{{Sourceattribution|GM Sigma platform}}