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 2018-2023 Owners Manual: Universal Remote System Operation


    Using the Universal Remote System Press and hold the appropriate Universal Remote system button for at least one-half second. The indicator light will come on while the signal is being transmitted. Erasing Universal Remote System Buttons Erase all programmed buttons when vehicle ownership is terminated...

    GMC Terrain 2018-2023 Owners Manual: Automatic Reversal System


    The sunroof has an automatic reversal system that is only active when the sunroof is operated in express-close mode. If an object is in the path while express closing, the reversal system will detect an object, stop, and open the sunroof again. If frost or other conditions prevent closing, override the feature by closing the sunroof in manual mode...

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