Making Changes To The GPCM And NOx Module Calibration
WARNING: This page is about a different car, the 2020 Ford F-550 Super Duty, 2020 Ford F-450 Super Duty, 2020 Ford F-350 Super Duty, 2020 Ford F-250 Super Duty, and 2020 Ford F-150. 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.