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)

When is the code detected?

If the current is outside of the expected range, DTC P0090 will set.

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)

P0090 GMC Description

The Engine Control Module (ECM) supplies power and ground to the Fuel Rail Pressure (FRP) regulator. The ECM monitors current on the circuits to detect a failure.