Making Changes To The GPCM And NOx Module Calibration
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2019 Ford Transit-350 HD, 2019 Ford Transit-350, 2019 Ford Transit-250, 2019 Ford Transit-150, and 2019 Ford F-550 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
At certain times, the entire flash EEPROM needs to be reprogrammed. This is due to changes made to the strategy or calibration after production. For some vehicles, the GPCM and NOx modules are reprogrammed with the PCM and are all programmed at the same time. Refer to PCM Reprogramming on the scan tool.