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DTC P228E - Fuel Pressure Regulator 1 Exceeded Learning Limits - Too Low

WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2018 Ford Transit-350 HD, 2018 Ford Transit-350, 2018 Ford Transit-250, 2018 Ford Transit-150, and 2018 Ford F-550 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
P228E - FUEL PRESSURE REGULATOR 1 EXCEEDED LEARNING LIMITS - TOO LOW

Description:  This DTC sets when the fuel rail pressure is 20% less than the calculated threshold.
Possible Causes: 
  • Biased fuel rail pressure (FRP) sensor
  • Engine mechanical concern
  • Fuel pressure control valve sticking
Diagnostic Aids:  The presence of this DTC may indicate that the vehicle is operating in derate mode and may experience a loss of power. After repair, the vehicle may still display a system warning message. Drive the vehicle until the system warning message has cleared from the instrument cluster message center.
The FRP sensor and fuel pressure control valve values can be monitored by accessing the FRP_A PID and the F_PCV PID.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All GO to PINPOINT TEST M .