The concept used a 3.5 L supercharged V6 that made 285 horsepower and 272 lb ft of torque mated to a 4T65-E electronically controlled automatic transmission.

Matched to a four-speed automatic transmission, the GT featured TAPshift, where the driver could select the gears manually.

GTs added an eight-speaker Monsoon stereo, premium cloth seats with six-way adjustment, remote start, ABS, and traction control.

The new GTP used a 3.9 L version of the GT's 3.5 L V6, but also utilizes variable valve timing (VVT), increasing output to 240 horsepower.

The GTP convertible was not available with the manual transmission and reduced its power to 227 hp, due to a more restrictive exhaust system.

Coupes and convertibles ceased production at the end of the 2009 model year, making examples with the 2009.5 changes fairly rare.

Most other Pontiac models had been discontinued, but the G6 was in high-demand for fleet vehicle orders, facilitating production to continue while the brand was wound down.

Ultimately, the G6 (as well as the Saturn Aura) were replaced by GM's revived Buick Regal nameplate in the United States and Canada.

Introduced in 2006, the G6's power-operated hydraulic retractable hardtop was engineered by the Pontiac, Michigan offices[2] of Karmann Technical Development, L.L.C.

[3] It was manufactured as a roof module by Karmann and delivered in-sequence to General Motors’ Orion Assembly center.

[5] In production, the two-piece metal top featured insulation to provide internal sound and interior thermal levels commensurate with its coupe counterpart.

[6] Ward's Automotive reported in 2008, that Karmann provided a revised, more robust retractable top, improving the panel-to-panel latch on the 2-piece clamshell lid, to eliminate squeaks and rattles.

[4] With its quality issues, a late launch due to development problems, and slow sales,[4] the G6 convertible was discontinued after model year 2009 and replaced by the Opel Cascada, marketed as a Buick in the U.S. in early 2016.

The Insurance Institute for Highway Safety gave the Pontiac G6 an overall Good score in the frontal offset crash test,[7] but an Acceptable score in the side impact crash test even though side airbags were introduced late in the 2006 model year.

The winners interviewed learned that although they did "get a car" from Winfrey during the broadcast, in actuality they had to go to the Pontiac dealership in their area to pick up the G6 because the vehicles that were shown in the studio's parking lot were used as a promotion.

"[11] The G6 was used in the GT class of Rolex Sports Car Series as a replacement for the Pontiac GTO.R after the GTO went out of production.

Weight saving features include carbon fiber body panels and shatter-resistant polycarbonate windows.

The front and rear fenders flared to cover the wide, 18-inch wheels and class-spec Hoosier racing tires.

On September 21, 2012, General Motors recalled 473,841 vehicles involving the Chevy Malibu, Pontiac G6, and Saturn Aura from model years 2007 through 2010 equipped with four-speed automatic transmissions.