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P0091 code sets on my 2005 Isuzu NPR, I can run the engine and unplug the regulator and get a weak 12-volt test light on the power supply wire. I don't have a wiring diagram and don't know if this is normal.

Vehicle: 2005 Isuzu NPR 5.2L Diesel

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This code indicates an issue with the fuel pressure sensor. Here is some info for you.

P0091 ISUZU - Fuel Pressure Regulator Solenoid 1 Control Circuit Low Voltage
Read more: https://www.autocodes.com/p0091_isuzu.html

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