DTC B1556: BCM EEPROM Write Error: Notes

DTC B1556 testing is run for each write block of writes to EEPROM. BCM writes to EEPROM cell and then reads data back. DTC B1556 will set when data read by BCM does not match data written to EEPROM after 3 consecutive attempts. DTC B1556 will clear when data read by BCM matches data written to EEPROM or when scan tool is used. A history DTC will clear after 50 consecutive ignition cycles if conditions for fault no longer exist.