GMC Terrain: Keys, Doors, and Windows / Doors

Safety Locks

The rear door safety locks prevent passengers from opening the rear doors from inside the vehicle. Manual Safety Locks If equipped, the safety lock is on the inside edge of the rear doors...

Liftgate

Warning Exhaust gases can enter the vehicle if it is driven with the liftgate or trunk/hatch open, or with any objects that pass through the seal between the body and the trunk/hatch or liftgate...

Other information:

GMC Terrain 2018-2025 Owners Manual: Cargo Cover

Warning An unsecured cargo cover could strike people in a sudden stop or turn, or in a crash. Store the cargo cover securely or remove it from the vehicle. Warning Do not place objects on the cargo cover. Sudden stops or turns can cause objects to be thrown in the vehicle...

GMC Terrain 2018-2025 Owners Manual: Reducing Speed While Using Cruise Control

If the cruise control system is already activated: Press and hold –SET until the desired lower speed is reached, then release it. To slow down in small increments, briefly press –SET. For each press, the vehicle goes about 1 km/h (1 mph) slower...