Conditions for Setting the DTC: P0089
WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
The fuel rail pressure regulator command necessary to maintain the desired fuel rail pressure is +/-2,500 kPa (363 psi) of the command expected by the controller.
DTCs P0087, P0088, and P0089 set when the above conditions are met for 1 seconds or for a cumulative of 10 seconds.