Check Engine Light came on and diagnostics says code P0089. What is the problem?

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I have a 3.2 L V6 engine. The diagnostics mentions Fuel Pressure regulator 1 performance. I was on an on ramp getting onto the high way. I shifted up from 5th to 6th gear and then the CEL came on. The car accelerates great and has the power when I want. I don't feel any hesitation. Gas mileage has decreased. The light hasn't shut off after 3 days of driving. Online searching mentions the following. Low Pressure Fuel Pump, High Pressure Fuel Pump, Fuel sensor, or Fuel Filter.