DTC B556: Odometer (Ee) Prom Error

NOTE: When all diagnosis and repairs are completed, clear codes and verify operation.

NOTE: For Prom identification, see Figure .

Code B556 indicates that the EE PROM, 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 EE PROM installation.

NOTE: New EEPROMs will have to be programmed with the current mileage, proper VIN, and option content.

If PROM is properly installed with no bent pins, then replace the EE PROM.
If a properly installed EE PROM continues to display "ERROR", replace the BCM.