The Koch Chemie One Cut & Finish P6.01 is a heavy hitting one step option that will diminish P2000 sanding marks. The abrasive breaks down, works for an extended period of time when used at medium speed with medium pressure using the One Cut Pad. This is a perfect option on a vehicle in good condition but isn't exactly new or an option to prep the finish before a ceramic.
One Cut has been known to work on GM Black. While not every paint is the same and there seems to be constant variance depending on year of manufacture, this can be a starting point in determining what will deliver the best results for your situation.
Match to Koch Chemie One Cut & Finish Pad
Cut: 6.0 Gloss: 8.0