The Anti-lock Braking System (ABS) has a relay, which sends voltage from the battery to the control solenoids. The solenoids are activated from the Electronic Brake Control Module (EBCM) microprocessor.
The solenoid coils have on their low side a feedback circuit to the controller microprocessor. When the solenoid receives the command to be activated, the feedback voltage is low, but when this is turned off, the feedback voltage will be higher.
The C0265 OBDII fault code setting indicates that the Electronic Brake Control Module motor relay circuit has experienced a performance failure.