GMC Terrain: Warning Lights, Gauges, and Indicators / Security Light

GMC Terrain. Security Light

The security light should come on briefly as the engine is started. If it does not come on, have the vehicle serviced by your dealer. If the system is working normally, the indicator light turns off.

If the light stays on and the engine does not start, there could be a problem with the theft-deterrent system. See Immobilizer Operation.

    Diesel Exhaust Fluid (DEF) Warning Light

    This light, a Driver Information Center (DIC) Message, and a chime come on when there is an issue with the DEF. If the DEF issue has not been corrected, the light will continue to flash...

    High-Beam On Light, Front Fog Lamp Light and Lamps On Reminder

    High-Beam On Light This light comes on when the high-beam headlamps are in use. See Headlamp High/Low-Beam Changer. IntelliBeam Light This light comes on when the IntelliBeam system, if equipped, is enabled...

    Other information:

    GMC Terrain 2018-2025 Owners Manual: Taillamps


    To replace one of these lamps: Open the liftgate. See Liftgate. Remove the two screw caps and two screws from the taillamp assembly. Pull the taillamp assembly out of the vehicle body. Disconnect the lamp wiring harness. Turn the bulb socket counterclockwise and pull it out...

    GMC Terrain 2018-2025 Owners Manual: Driving for Better Fuel Economy


    Driving habits can affect fuel mileage. Here are some driving tips to get the best fuel economy possible: Set the climate controls to the desired temperature after the engine is started, or turn them off when not required. Avoid fast starts and accelerate smoothly...

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