What's the 2017 Chevy Impala power steering fluid type?

The exact part for Your vehicle is going to be GM89021185 Power Steering fluid. In general, You can use any Dexron ViATF in here; for example, You can pick up a gallon of Castrol 1599F1 for about $30 at Advance Auto Parts and dump that in, and it'll be just fine, as it'll be compatible with Your 2017 Chevrolet Impala. (Yes, this is correct: You use ATF in the power steering; it's the same lube). Some signs that You've got a low power steering fluid condition are if You're having a lot of difficulty when You try to turn the wheel; though there could be other causes, low fluid is the big one. Additionally, You might hear loud noises when You steer --- it should normally be a quiet operation!