CUSTOMER CONCERN After engine-harness replacement, the skid-control ECU stores DTCs C1252, C1253, C1256, and C1345. CAUSE The skid-control ECU with actuator failed after the brake-booster pump power, ground, and direct-operation checks. CORRECTION Remove and replace the failed skid-control ECU with actuator.

CUSTOMER CONCERN After rear caliper and hose replacement, the brake system stores DTCs C1203, C1345, and C1451. CAUSE The brake hydraulic system was not fully bled, preventing the linear-solenoid valve offset calibration from completing. CORRECTION Perform the complete scan-tool brake bleeding procedure, clear DTCs C1203, C1345, and C1451, perform the linear-solenoid valve offset calibration on level ground with skid-control voltage near 13 volts, and verify normal brake oper

CUSTOMER CONCERN ABS and traction-control warning lamps remain on after body repairs with DTCs C1253, C1256, and C1345. CAUSE Battery feeds and fuses to skid-control ECU connector A28 were verified, confirming an internal failure of the skid-control ECU with actuator; the brake-booster pump could not operate for linear-valve learning. CORRECTION Remove and replace the skid-control ECU with actuator, perform the automated brake bleed and linear-valve offset calibration, clear

CUSTOMER CONCERN After rear brake-caliper replacement, DTCs C1203, C1345, and C1451 are stored. CAUSE The brake hydraulic system had not been completely bled and the linear-valve offset had not been learned after brake service; C1451 indicates the brake pump is disabled until bleeding is completed. CORRECTION Perform the complete scan-tool brake-bleeding procedure, clear DTCs C1203, C1345, and C1451, perform the linear-valve offset calibration on level ground, and verify norm

CUSTOMER CONCERN After left-rear caliper and brake-hose replacement, C1203, C1345, and C1451 remain stored. CAUSE Air remained in the hydraulic brake system, preventing the linear-solenoid valve offset calibration from completing. CORRECTION Perform the scan-tool brake bleeding procedure until all air is removed, then perform the linear-solenoid valve offset calibration, clear DTCs, and verify brake operation.

CUSTOMER CONCERN Following collision repairs and replacement of the brake-booster pump, DTCs C1252, C1253, C1256, C1345 and C1465 remain stored. CAUSE Accumulator pressure was low because air remained in the electronically controlled brake hydraulic system. CORRECTION Perform the scan-tool-assisted brake bleeding procedure, clear C1252, C1253, C1256, C1345 and C1465, and verify accumulator pressure and brake operation.

CUSTOMER CONCERN After replacement of a burned engine wiring harness, the skid-control ECU stores C1252, C1253, C1256 and C1345. CAUSE Power and ground testing isolated the remaining brake-system fault to a failed skid-control ECU with actuator. CORRECTION Remove and replace the skid-control ECU with actuator, clear C1252, C1253, C1256 and C1345, and verify electronically controlled brake operation.

CUSTOMER CONCERN Customer requests diagnosis because the skid-control system will not complete calibration and stores DTCs C1345 and C1368. CAUSE The skid-control ECU had not completed the linear-solenoid-valve offset learning. Calibration required a properly bled brake system, cleared learning memory and at least 12.6 volts at the skid-control ECU. CORRECTION Perform the bidirectional brake bleeding procedure, clear the skid-control learning memory and perform the linear-sol