GMC Terrain: Performance and Maintenance / Roadside Assistance Program

Diesel Exhaust Fluid

Diesel Exhaust Fluid (DEF) is used with diesel engines to reduce the amount of regulated emissions produced. The DEF system must be maintained for the vehicle to run properly...

Keys, Doors, and Windows

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Other information:

GMC Terrain 2018-2026 Owners Manual: Instrument Panel Illumination Control

The brightness of the instrument cluster display, infotainment display and controls, steering wheel controls, and all other illuminated controls, as well as feature status indicators can be adjusted. The knob for this feature is on the instrument panel beside the steering column. Push the knob in all the way until it extends out and then turn the knob clockwise or counterclockwise to br..

GMC Terrain 2018-2026 Owners Manual: Washer Fluid

What to Use When windshield washer fluid is needed, be sure to read the manufacturer's instructions before use. If operating the vehicle in an area where the temperature may fall below freezing, use a fluid that has sufficient protection against freezing. Adding Washer Fluid Open the cap with the washer symbol on it. Add washer fluid until the tank is full. See Engine Compartment Overvi..