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)
– 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?
If the fuel rail pressure sensor indicates a pressure more than 20 MPa greater than desired, diagnostic trouble code (DTC) P0089 will set.
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
P0089 GMC 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.