CUSTOMER CONCERN The ABS relays click rapidly after an incorrect brake-bleeding attempt, and DTCs C1253 and C1256 are stored. CAUSE Power, ground, and communication checks confirmed an internal failure of the skid-control electronic control unit. CORRECTION Remove and replace the failed skid-control electronic control unit.

CUSTOMER CONCERN The ABS and brake warning lights are on, DTC C1391 is stored, and the ABS pump cycles as accumulator pressure falls. CAUSE Accumulator-pressure testing confirmed internal leakage in the ABS brake actuator assembly. CORRECTION Remove and replace the failed ABS brake actuator assembly. Perform the required actuator initialization.

CUSTOMER CONCERN The ABS, brake, and traction-control warning lights remain on, and the vehicle will not move. CAUSE The 12-volt battery dropped to approximately 7 volts with the ignition on, confirming the battery could not support vehicle-system operation. CORRECTION Remove and replace the failed 12-volt battery.