DTC C1608: Implausible diagnosis data: Operation
WARNING: This page is about a different car, the 2015 Mitsubishi Lancer. However, it is still accessible from the selected car via links, so may be relevant.
The ASC-ECU stores diagnostic trouble codes and failure information in the EEPROM*.
ASC-ECU (EEPROM*) contains the power supply circuit (terminal No. 2).
NOTE:
*: EEPROM (Electrical Erasable and Programmable ROM)