For 2016, fine-tuning is the name of the game, with GMC adding safety features and bling on the outside, while inside, the latest Apple and Android smart phones will be able to drive the Sierra's infotainment system.
In our book, though, some of the biggest news is hidden under the sheet metal: GM's eight-speed automatic transmission will be standard on SLT and Denali models with the 5.3-liter V8.
For 2016, the available Driver alert package, which gives audible and haptic warnings when following too closely or straying out of marked lanes, adds lane keep assist and IntelliBeam headlamp control.
Convenience and comfort upgrades include available remote tailgate locking and unlocking and, on Sierra Denali, optional power/retractable running boards.
The heated and vented seats available on upper trims no longer have a vent in the back of the front seats that releases warm air toward the rear passengers.
Android Auto is built around Google Maps, Google Now and the ability to talk to Google, as well as a growing audio and messaging app ecosystem that includes WhatsApp, Skype, Google Play Music, Spotify and podcast players.
