DTC B0603, BCM Internal Memory Malfunction (Write Error): Notes

BCM calibrations are stored in EEPROM. When ignition is first turned on, BCM performs internal tests on EEPROM and determines integrity of its non-volatile memory. BCM will also attempt to write to its own non-volatile memory.

DTC B0603 will set when BCM has 3 consecutive unsuccessful attempts at writing to its own non-volatile memory, or when an internal memory malfunction (write error) is detected by BCM. No driver warning message will be displayed.

DTC B0603 requires an ignition cycle to change from current to history. If conditions for malfunction no longer exist, history DTC will clear after 100 consecutive ignition cycles. DTC B0603 will also clear when conditions no longer exist or when scan tool is used to clear codes.