Possible causes
– Faulty fuel pressure regulator
– Fuel pressure regulator harness is open or shorted
– Fuel pressure regulator electrical circuit poor connection
– Faulty fuel pressure sensor
– Fuel pressure regulator harness is open or shorted
– Fuel pressure regulator electrical circuit poor connection
– Faulty fuel pressure sensor
When is the obd code mean?
Fuel rail pressure greater than 1450psi over desired rate
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
P0089 ISUZU OBD Code 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.