I don't have the power liftgate and I wonder if there is a way to open the tailgate from inside the vehicle
Without the power tailgate no there is not a way to open it from inside. The remote keyfob might have a rear hatch release button if it doesn't have remote start.
There is an access panel on the inside of the rear hatch, about 5" X 4", remove that and there is a lever inside about an inch and below the opening, it moves to the right to release the catch
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