GMC Terrain: Warning Lights, Gauges, and Indicators / Emissions Inspection and Maintenance Programs

If the vehicle requires an Emissions Inspection/Maintenance test, the test equipment will likely connect to the vehicle's Data Link Connector (DLC).

GMC Terrain. Emissions Inspection and Maintenance Programs

The DLC is under the instrument panel to the left of the steering wheel. Connecting devices that are not used to perform an Emissions Inspection/Maintenance test or to service the vehicle may affect vehicle operation. See Add-On Electrical Equipment. See your dealer if assistance is needed.

The vehicle may not pass inspection if:

  • The light is on when the engine is running.
  • The light does not come on when the ignition is in Service Mode.
  • Critical emission control systems have not been completely diagnosed. If this happens, the vehicle would not be ready for inspection and might require several days of routine driving before the system is ready for inspection. This can happen if the 12-volt battery has recently been replaced or run down, or if the vehicle has been recently serviced.

See your dealer if the vehicle will not pass or cannot be made ready for the test.

    Malfunction Indicator Lamp (Check Engine Light)

    This light is part of the vehicle’s emission control on-board diagnostic system. If this light is on while the engine is running, a malfunction has been detected and the vehicle may require service...

    Brake System Warning Light

    The vehicle brake system consists of two hydraulic circuits. If one circuit is not working, the remaining circuit can still work to stop the vehicle...

    Other information:

    GMC Terrain 2018-2022 Owners Manual: Filling the DEF Tank


    Caution Use only DEF that is GM approved, or fluid containing the API certified or ISO 22241 label. The use of other fluids could damage the system, requiring costly repairs that will not be covered by the vehicle warranty. Caution Do not mix fuel with DEF, and do not put DEF in the fuel tank...

    GMC Terrain 2018-2022 Owners Manual: Cargo Tie-Downs


    Convenience Net Retainers Cargo Tie-Downs The vehicle may be equipped with two cargo tie-downs and two convenience net retainers in the rear compartment. Convenience Net This vehicle may have a convenience net in the rear of the vehicle. Attach it to the convenience net retainers for storing small loads...

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