Ask an OnStar Question at Graff Mt. Pleasant

At Graff Mt. Pleasant, we are pleased to provide our customers with OnStar. OnStar gives drivers a sense of security and connectivity while they are on the road, and features services such as Roadside Assistance, Navigation, Hands-Free Calling, and Automatic Crash Response

With so many features, it can be hard to learn how to work every single one of them. To help you understand your OnStar Auto Security, we encourage you to contact our tech experts at Graff Mt. Pleasant! We know the ins and outs of OnStar and can quickly and thoroughly answer any questions you might have. To contact us, click the button to the left or give us a call at (989) 773-3937.

What is OnStar?

  • OnStar is a GM auto security system that provides customers with a range of auto security and safety features.

What features does OnStar offer?

  • Turn-by-Turn Navigation
  • Hands-Free Calling
  • Remote Diagnostic System
  • Automatic Crash Response
  • Roadside Assistance
  • So much more!

Who do I contact if I have a question about OnStar?

  • Our OnStar experts can be reached via the contact form on this page or by calling (989) 773-3937.


OnStar’s Automatic Crash response feature is your backup plan should you be involved in an accident, at which point a specially trained OnStar Emergency Advisor will be immediately connected to your vehicle. They will send emergency responders to your exact location if you request help or can’t answer.

You can also reach this emergency service by pushing the red SOS button. OnStar is available 24/7 so you can rest assured that you will be taken care of in a crisis. No matter what happens on the road, OnStar is your link to emergency service providers.


OnStar Security Protection is a great way to protect your vehicle in the event of auto theft. With Stolen Vehicle Assistance, OnStar will work with the police to recover it.

If you find yourself stranded somewhere with an empty gas tank or a flat tire, Roadside Assistance can be reached with the push of your OnStar button. Shortly after, OnStar will contact a nearby car dealership, towing service or gas station and will send them your exact location.


With OnStar Navigation Assistance, you can plan out your route ahead of time and send it to your vehicle via OnStar Turn-by-Turn navigation and eNav. The eNav feature is designed for convenience since it completely eliminates the need to manually enter an address while driving. Instead, you can program and send directions to your vehicle before you get behind the wheel.


With OnStar Hands-Free Calling, you’ll be able to stay connected and focused on the road ahead. All you need to do is push the Voice Command button to make or take a call. Once you’ve pushed the button and said the phone number or stored name you’d like to contact, OnStar will connect you.

With the OnStar RemoteLink mobile app, you’ll be able to have reliable and easy calling on the go. Simply connect to your vehicle with the mobile app and you’ll be able to control certain features of your vehicle. This includes viewing real-time diagnostic information, and more.


OnStar Diagnostics is a great way to know what exactly is going on with your vehicle. Diagnostic information is sent to you monthly via email reports. This ensures you know what’s going on with your vehicle in easy to understand language and images.

This feature also gives you the option to run a diagnostic report while you’re on the road. All you have to do is push a blue button and an OnStar Advisor will contact you and conduct a real-time check for you. While the diagnostic reports can be accessed at any time, OnStar will automatically run hundreds of checks and maintenance reviews on your vehicle’s main operating systems. For questions and concerns, contact us via the form!