Code B556, Odometer (Ee) Prom Error
Code B556 indicates that EEPROM, which records elapsed odometer mileage, is not being read by BCM. Usually along with Code B556, ERROR will be displayed in the odometer display. The EEPROM contains specific vehicle information such as vehicle ID number, season odometer mileage and certain vehicle options. Since this information is programmed for the specific vehicle in which it is installed, an EEPROM cannot be transferred from one vehicle to another. Check for proper EEPROM installation. If the EEPROM is properly installed (no bent pins) but Code B556 persists, replace EEPROM. Obtain replacement EEPROMs through an authorized Delco Service Center.