GMC Terrain: OnStar / OnStar Overview
Voice Command Button
Blue OnStar Button
Red Emergency Button
This vehicle may be equipped with a comprehensive, in-vehicle system that can connect to an OnStar Advisor for Emergency, Security, Navigation, Connections, and Diagnostics Services. OnStar services may require a paid service plan and data plan. OnStar requires the vehicle battery and electrical system, cellular service, and GPS satellite signals to be available and operating. OnStar acts as a link to existing emergency service providers. OnStar may collect information about you and your vehicle, including location information. See OnStar User Terms, Privacy Statement, and Software Terms for more details including system limitations at www.onstar.com (U.S.) or www.onstar.ca (Canada).
The OnStar system status light is next to the OnStar buttons. If the status light is:
Solid Green: System is ready.
Flashing Green: On a call.
Red: Indicates a problem.
Off: System is off. Press 
twice to speak with an OnStar
Advisor.
Press 
or call 1-888-4ONSTAR
(1-888-466-7827) to speak to an
Advisor.
Functionality of the Voice Command button may vary by vehicle and region.
Press 
to:
- Open the OnStar app on the infotainment display. See the infotainment manual for information on how to use the OnStar app.
Or
- Make a call, end a call, or answer an incoming call.
- Give OnStar Hands-Free Calling voice commands.
- Give OnStar Turn-by-Turn Navigation voice commands.
- Obtain and customize the Wi-Fi hotspot name or SSID and password, if equipped.
Press 
to connect to an
Advisor to:
- Verify account information or update contact information.
- Get driving directions.
- Receive a Diagnostic check of the vehicle's key operating systems.
- Receive Roadside Assistance.
- Manage Wi-Fi Settings, if equipped.
Press 
to get a priority
connection
to an OnStar Advisor available
24/7 to:
- Get help for an emergency.
- Be a Good Samaritan or respond to an AMBER Alert.
- Get assistance in severe weather or other crisis situations and find evacuation routes.
OnStar
..
Other information:
GMC Terrain 2018-2025 Owners Manual: Wheel Alignment and Tire Balance
The tires and wheels were aligned and balanced at the factory to provide the longest tire life and best overall performance. Adjustments to wheel alignment and tire balancing are not necessary on a regular basis. Consider an alignment check if there is unusual tire wear or the vehicle is significantly pulling to one side or the other. Some slight pull to the left or right, depending on t..
GMC Terrain 2018-2025 Owners Manual: Door Locks
To lock or unlock the vehicle from the outside, press or on the Remote Keyless Entry (RKE) transmitter. : Press to lock the doors. : Press to unlock the doors. To manually unlock a door from inside the vehicle, pull once on the door handle to unlock it, and a second time to open it. Keyless Access Press the button on the driver door when the RKE transmitter is within 1 m (3 ft). When..
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- 2nd Generation Terrain Service Manual
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Vehicle Messages
Messages displayed on the DIC indicate the status of the vehicle or some action that may be needed to correct a condition. Multiple messages may appear one after another.
The messages that do not require immediate action can be acknowledged and cleared by pressing V. The messages that require immediate action cannot be cleared until that action is performed.
