P0089 ISUZU - Fuel Rail Pressure Performance
- Faulty fuel pressure regulator
- Fuel pressure regulator harness is open or shorted
- Fuel pressure regulator electrical circuit poor connection
- Faulty fuel pressure sensor
When is the code detected?
Fuel rail pressure greater than 1450psi over desired rate
- Engine Light ON (or Service Engine Soon Warning Light)
P0089 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.