B556

Code B556 indicates that the EEPROM, which records elapsed odometer mileage, is not being read by the BCM. usually along with code B556 "ERROR" will be displayed in the odometer display.
^ check for proper eeprom installation.
^ If PROM is properly installed, no bent pins, then replace EEPROM.


NOTE: New EEPROM will have to be adjusted to the current mileage and proper Vin and option content by the DELCO Repair Station.


^ If a properly installed EEPROM continues to set B556, replace BCM