DTC B1557: EEPROM Calibration Error: Testing
- If instrument panel cluster diagnostic system check has been performed, go to next step. If instrument panel cluster diagnostic system check has not been performed, go to INSTRUMENT PANEL CLUSTER DIAGNOSTIC SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM.
- Using scan tool, clear DTCs. Turn ignition off and back on. Recheck for IPC DTCs. If DTC B1557 is set as current, go to next step. If DTC B1557 is not set as current, system is okay at this time.
- Replace IPC. See INSTRUMENT PANEL CLUSTER (IPC) under REMOVAL & INSTALLATION. Using scan tool, obtain approximate mileage, and contact an authorized Delco service center for transfer of information from failed IPC to replacement IPC.