See also:

General Information
For service and parts needs, visit your dealer. You will receive genuine GM parts and GM-trained and supported service people. Genuine GM parts have one of these marks: ...

Using the “Re-dial” Command
1. Press and hold for two seconds. 2. After the tone, say “Re-dial.” Once connected, the person called will be heard through the audio speakers. ...

Passing
More passing distance is needed when towing a trailer. The combination will not accelerate as quickly and is longer so it is necessary to go much farther beyond the passed vehicle before returning to ...