P0087 - Fuel Rail Pressure Too Low  Special Tools: Click to display a list of tools used in this procedure When Monitored and Set Conditions When Monitored: This diagnostic runs continuously when the following conditions are met: • With the engine running. Set Conditions: • The Powertrain Control Module (PCM) detects that the actual fuel pressure reading is below a calibrated threshold. This DTC will cause active regeneration to be disabled. Default Actions: • The