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To get the GMC Terrain going, you'll need a pair of jumper cables and another vehicle to transfer battery power. Connect the negative cables to the negative terminals and the positive cable to the positive terminals. Have the other vehicle start up to charge the battery, then try starting your car with the key. The car should start up. It's a good idea to drive around for about 30 minutes to give the battery a chance to recharge.
To begin the engine of a 2015 GMC Terrain using jumper cables, first connect the cables to the terminals of the functioning battery, then attach the positive cable to the dead battery's positive terminal and the vehicle's frame.