With OnStar, you get the help you need even if you can't ask for it. In a crash, built-in vehicle sensors can automatically alert an OnStar Advisor who is immediately connected into your vehicle and can request emergency help to be sent to your exact location. OnStar Advisors are available 24 hours a day, 7 days a week and will stay on the line for as long as you need. OnStar is the only safety, security and communications system available across a wide range of GM vehicles that combines these important safety features.