Code B556, Odometer (Ee) Prom Error
Code B556 indicates EEPROM, which records elapsed odometer mileage, is not being read by BCM. Usually along with Code 556, ERROR will be displayed in odometer display. EEPROM contains specific vehicle information such as vehicle ID number, season odometer mileage and certain vehicle options. Since this information is programmed for specific vehicle in which it is installed, an EEPROM cannot be transferred from one vehicle to another. Check for proper EEPROM installation. If EEPROM is properly installed and pins are not bent but Code B556 persists, replace EEPROM. Replacement EEPROMs must be obtained through an authorized Delco Service Center.