P0091 ISUZU - Fuel Pressure Regulator Solenoid 1 Control Circuit Low Voltage

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What does this mean?

P0091 Isuzu Possible Causes

  • Faulty fuel pressure sensor
  • Fuel pressure sensor harness is open or shorted
  • Fuel pressure sensor electrical circuit poor connection
  • Faulty Engine Control Module (ECM)

When is the code detected?

Fuel Pressure Regulator (FRP) feedback current less than 400mA

P0091 Isuzu Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P0091 Isuzu Meaning

The Engine Control Module (ECM) uses commanded fuel pump flow to determine a desired fuel rail pressure. The actual fuel pressure is monitored using the Fuel Rail Pressure (FRP) Sensor.
OBDII Code P0091 Isuzu - Fuel Pressure Regulator Solenoid 1 Control Circuit Low Voltage - Engine-Codes.com

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