Engine-Codes - Isuzu - P0091 ISUZU

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

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What is this?
Table of contents

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)

How is the P0091 ISUZU code repair?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

What is the cost to diagnose the P0091 ISUZU code

Labor: 1.0

The cost to diagnose the P0091 ISUZU code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.

When is the code detected?

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

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.

More Information

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