Fuel Pressure Regulator Solenoid 1 Control Circuit Low Voltage
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 do I fix code P0091 ISUZU?
Check 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.
Cost of diagnosing the P0091 ISUZU code
The cost of diagnosing the P0091 ISUZU code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. 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 Description
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.