Replacing the GMC badged version of General Motors’ C/K pickup truck line, the GMC Sierra 1500 was extensively reengineered for 1999. The 1999 GMC Sierra was launched as a regular cab and extended cab model with rear access doors. A crew cab version of the Sierra was not added until the 2005 model year. Propulsion options for the 1999 GMC Sierra 1500 consisted of a 4.3-liter V-6 powerplant as well as 255-horsepower 4.8-liter and 270-horsepower 5.3-liter V-8 engines.
In 2001, GMC launched a high-class version of the Sierra 1500 called the C3. Featuring a unique appearance and several high-quality features such as Dynamic Brake Propositioning System, the GMC Sierra C3 would continue as the Sierra Denali in 2002. 2002 also brought an innovative feature to the GMC Sierra 1500. A four-wheel steering system called Quadrasteer was briefly available on the GMC Sierra 1500 (standard on the 2002 Sierra Denali). Due to the high-price of the technology and lack of consumer interest, Quadasteer was discontinued after a few years.
In 2004, a hybrid model of the GMC Sierra 1500 was introduced with a starter generator and torque converter providing fuel savings as well as mobile auxiliary power. The GMC Sierra 1500 received an all-new platform and design for the 2007 model year. A 4.3-liter V-6, 4.8-liter V-8, 5.3 liter V-8 and a 367-horsepower 6-liter V-8 engine powered the 2007 GMC Sierra. A new hybrid version of the GMC Sierra was introduced for 2009 combining two electric motors with a 6-liter V-8 gasoline engine. For 2014, the GMC Sierra is all new powered by a choice of EcoTec3 engines.