Electrically Erasable Programmable Read-Only Memory
WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
The Electrically Erasable Programmable Read-Only Memory (EEPROM) is a permanent memory that is part of ECM. EEPROM cannot be replaced. EEPROM contains program and calibration information that PCM uses to control powertrain. If ECM is replaced, ensure NEW ECM software/calibration is correct and most recent version for vehicle. EEPROM must be programmed when NEW ECM is installed. Program EEPROM using latest software for that specific vehicle. See ENGINE CONTROL MODULE under PROGRAMMING.