Does the 2014-2018 GMC Sierra 1500 use power steering fluid?
Short answer: no. The 2014-2018 GMC Sierra 1500 has electric power steering, so there's no fluid to buy or change. Here's what that means and what your Sierra 1500 does need.
There's no power-steering fluid to buy for this car
The 2014-2018 GMC Sierra 1500uses electric power steering — the assist comes from a motor, not a hydraulic pump and reservoir. That means there's no power-steering fluid to top off, no reservoir to check, and nothing to change on an interval. If a steering warning light comes on, that's a service visit, not a parts-store run.
This is the OEM answer for your car, not a missing record — your owner's manual confirms the electric power-steering system.