2011 GMC Terrain 2.4L Engine Light On with P0089 and P0228D Fuel Pressure Codes

Model: 2011 GMC Terrain Fault Code: P0089 Posted: 2022-01-15 20:05

My 2011 GMC Terrain has developed engine light and StabilityTrak warning lights, and the vehicle now reduces engine power upon startup. After scanning the OBD2 system, I'm seeing two fault codes: P0089 and P0227D — both related to high fuel pressure. I've measured the fuel pressure and it reads 60 psi, which is above the normal range for this model. I have already replaced both the high-pressure fuel pump and fuel pressure regulators (FP Regulator 1 and 2). Despite these repairs, the issue persists. I'm now unsure whether there's another component involved or if the problem lies in a sensor reading or wiring. Any insights on how to diagnose or fix this would be greatly appreciated.