When there is a calibration update available for an OBD-II vehicle, the old EEPROM is removed from its socket in the PCM and a new EEPROM with the updated software is installed in its place.

Question

Quizplus · Accepted Answer

Modern OBD-II vehicles typically receive calibration updates through a process called "flashing," where the updated software is electronically transferred to the vehicle's Powertrain Control Module (PCM) without the need to physically remove or replace the EEPROM.

When There Is a Calibration Update Available for an OBD-II