Languages
The vehicle can be programmed to respond in French or Spanish. Push 
and ask an Advisor. Advisors can speak French or Spanish.
See also:
Three-Way Calling
Three-way calling must be supported on the cell phone and enabled by the wireless service carrier.
1. While on a call, press .
2. Say “Three-way call.” 3. Use the dial or call command to dial th ...
Vehicle and Power Issues
OnStar services require a vehicle electrical system, wireless service, and GPS satellite technologies to be available and operating for features to function properly. These systems may not operate if ...
Overview
The GMC Sierra All Terrain HD concept is an exploration of heavy-duty truck
capability combined with greater off-road versatility. It is highlighted by a
bold exterior design, enhanced all-terrain ...