On that vehicle it is part of the fuel pump/sending unit, the image below is what it looks like. But the code you list should not apply to your vehicle because the regulator is not electrically controlled and that is what that code means, that the ECM cannot control the regulator because of a circuit failure. Being that your vehicle does not even have that circuit I would say it is a false code.
An easy way to test the regulator is to connect a fuel pressure test gauge to the port on the fuel rail. You should see 55-60 psi with the engine running at an idle. Then shut off the engine and watch the pressure it should drop less than 10 psi in one minute.
Other than the code what problem/issue are you having?
Image (Click to make bigger)
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Wednesday, March 28th, 2018 AT 5:03 PM