GMC Terrain: Performance and Maintenance / 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. It is normal to hear the DEF system purge fluid back into the tank after the vehicle is shut off.

Locating Diesel Exhaust Fluid

DEF can be purchased at a GMC dealer. It can also be purchased at authorized vehicle dealerships. Additionally, some diesel fueling stations or retailers may have DEF. For vehicles with an active OnStar service plan, OnStar can help to locate a DEF retailer. See Customer Assistance Offices for phone numbers to assist you in contacting a GM dealer. See Recommended Fluids and Lubricants.

As the DEF tank becomes low on fluid, warnings begin with approximately 1 600 km (1,000 mi) of remaining range. These warnings will increase in intensity as the tank becomes empty. Once the tank is empty, the vehicle speed will be limited. If there is an issue with the quality of the fluid or the exhaust fluid system, warnings will be displayed in the Driver Information Center (DIC). See Diesel Exhaust Fluid.

    Diesel Particulate Filter

    The engine is equipped with a Diesel Particulate Filter (DPF) that will filter or trap particulates. The DPF is under the vehicle in the exhaust system...

    Roadside Assistance Program

    U.S.: 1-888-881-3302 TTY Users (U.S. Only): 1-888-889-2438 Canada: 1-800-268-6800 New GMC owners are automatically enrolled in the Roadside Assistance Program...

    Other information:

    GMC Terrain 2018-2023 Owners Manual: Cold Weather Operation (Diesel)


    In cold weather, the fuel filter may become clogged by wax naturally present in the fuel. To unclog it, move the vehicle to a warm garage area and allow the filter to warm up. The fuel filter may need to be replaced. See Fuel Filter Replacement (Diesel)...

    GMC Terrain 2018-2023 Owners Manual: Vehicle Personalization Settings


    To have the Seat Entry Memory movement begin when the vehicle is started, select the Settings menu, then Vehicle, then Seating Position, and then Seat Entry Memory. Select On or Off. See “Seat Entry Memory” later in this section. Seat Exit Memory movement begins when the ignition is turned off and the driver door is opened, or when the ignition is turned off with the d..

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