See also:

Muting a Call
During a call, all sounds from inside the vehicle can be muted so that the person on the other end of the call cannot hear them. • To mute a call, press , and then say “Mute call.” . To cancel ...

New for 2011
The Sierra Hybrid gets GM's OnStar 9.0 telematics system that GM says provides better voice recognition. GM also said they have worked to cut down on the amount of wind noise occupants hear. ...

Spacious, refined interior
Interior space is roomier - including increased cargo capacity - and has a spacious, luxurious environment, thanks to a premium two-tone color scheme and a lower-positioned instrument panel. New t ...