CUSTOMER CONCERN Advanced hydraulic-booster pump remains on and the brake system stores code 14. CAUSE The pump produced approximately 1,740 psi, but pressure dropped with no external fluid leak, confirming an internal leak in the advanced hydraulic-booster servo unit. CORRECTION Remove and replace the internally leaking advanced hydraulic-booster servo unit.

CUSTOMER CONCERN ABS warning light is on with DTC C1015-64. CAUSE Vacuum-system testing confirmed a failed brake-booster vacuum check valve. CORRECTION Remove and replace the failed brake-booster vacuum check valve. Verify brake-booster vacuum operation.

CUSTOMER CONCERN Service Stability warning is on and DTC C0710 resets immediately after clearing. CAUSE Testing confirmed a failed steering-wheel position sensor. CORRECTION Remove and replace the failed steering-wheel position sensor. Center and calibrate the replacement sensor.

CUSTOMER CONCERN Service Stability message is displayed with DTC C0710-5A. CAUSE Testing confirmed a failed steering-wheel position sensor. CORRECTION Remove and replace the failed steering-wheel position sensor. Center and calibrate the replacement sensor.

CUSTOMER CONCERN ABS and traction-control warning lights are on with DTCs P0AC4 and U1820. CAUSE Testing isolated the fault to the Electronic Brake Control Module connector and the EBCM. CORRECTION Repair the EBCM connector and remove and replace the failed Electronic Brake Control Module.

CUSTOMER CONCERN The ABS and traction-control warning lights remain on, and DTC C1018 will not clear. CAUSE The brake-control calibration was incomplete, leaving the ABS module without the required learned values. CORRECTION Perform the factory scan-tool brake and ABS relearn procedure.

CUSTOMER CONCERN The ABS warning light is on with DTC C1015-64 stored. CAUSE Testing confirmed a failed brake-booster vacuum check valve that prevented the system from developing the required vacuum. CORRECTION Remove and replace the brake-booster vacuum check valve.

CUSTOMER CONCERN Customer states the traction-control warning light comes on intermittently. EBCM DTC C0561-71 is stored. CAUSE Traction-control switch input testing on the Brown/White circuit 1571 isolated an intermittent terminal connection at the traction-control switch connector. CORRECTION Clean and repair traction-control switch connector terminals, clear DTC C0561-71 and verify the BCM switch input remains in the enabled state.

CUSTOMER CONCERN Customer states brake pressure was lost at the right rear after rear brake and caliper replacement, and manual, gravity and pressure bleeding did not restore the pedal. CAUSE Air remained trapped in the electronically controlled hydraulic brake system, and zero accumulator pressure prevented the scan-tool bleed routine from operating normally. CORRECTION Operate brake pump to establish accumulator pressure, then perform complete hybrid ABS service-bleed proce

CUSTOMER CONCERN Customer states the ABS and brake warning lights are on and the ABS pump runs repeatedly. DTC C1391 is stored. CAUSE No external brake-fluid leak was found, and accumulator pressure dropped after pump shutdown, confirming internal leakage in the ABS brake actuator. CORRECTION Remove and replace ABS brake actuator assembly. Perform actuator initialization and complete brake-system bleed, clear DTC C1391 and verify accumulator pressure holds.

CUSTOMER CONCERN Customer states the 12-volt battery went dead during an alignment and DTCs C1203 and C1345 are now stored. CAUSE Loss of battery voltage erased the linear-solenoid valve offset calibration, leaving the brake-control system incorrectly configured. CORRECTION Perform linear-solenoid valve initialization and calibration, complete yaw-rate sensor calibration as required, clear DTCs C1203 and C1345 and verify brake-system operation.

CUSTOMER CONCERN Customer states the replacement brake actuator pump will not run or build pressure. DTCs C1246, C1364 and C1365 are stored, and accumulator pressure reads zero. CAUSE The hydraulic system had no accumulator pressure after actuator installation, preventing normal pump control until pressure was established and the service routine completed. CORRECTION Power brake-pump motor to establish accumulator pressure, perform complete ABS bleed and linear-valve relearn,

CUSTOMER CONCERN Customer states the brake pedal is low after replacement of a failed front brake hose. DTC C1525 is stored. CAUSE Air remained trapped in the electronically controlled hydraulic brake system because the required hybrid service-bleed routine had not been completed. CORRECTION Perform complete hybrid ABS bleed procedure with a compatible scan tool and pressure bleeder. Clear DTC C1525 and verify brake-pedal height.

CUSTOMER CONCERN Customer states the ABS, brake and traction-control warning lights are on. DTCs C1241, C1256 and C1391 are stored. CAUSE Accumulator-pressure voltage dropped after the pump shut off, confirming internal leakage in the ABS brake actuator assembly. CORRECTION Remove and replace ABS brake actuator assembly. Perform actuator initialization and brake-system bleed. Clear brake DTCs.

CUSTOMER CONCERN Customer states the ABS, traction-control and brake warning lights remain on after brake-booster pump replacement and bleeding. DTC C1253 is stored. CAUSE The ABS MTR1 fusible link and pump feed circuit tested correctly, isolating the fault to Engine Room Relay Block 2/Engine Room Junction Block 2. CORRECTION Remove and replace Engine Room Relay Block 2/Engine Room Junction Block 2. Clear brake-system DTCs and verify booster-pump operation.

CUSTOMER CONCERN Customer states the ABS warning light is on. DTCs C1321, C1475 and U2023 are stored. CAUSE No external brake-fluid leaks were found, confirming an internal failure of the ABS hydraulic unit/control module assembly. CORRECTION Remove and replace ABS hydraulic control unit/control module assembly. Program module, perform hybrid ABS bleed procedure and clear DTCs.

CUSTOMER CONCERN Customer states the brake lights intermittently remain on. DTCs C0561 and C0161 are stored. CAUSE Brake-booster alignment caused incorrect brake-switch operation, confirming a misadjusted booster-to-cowl mounting position. CORRECTION Remove brake booster, install specified spacing washers on the booster studs and reinstall booster. Clear brake DTCs and verify brake-light operation.

CUSTOMER CONCERN Customer states the brake actuator makes a loud clunk or bang with the brake pedal applied. DTC C1241 is stored. CAUSE C1241 subcode testing confirmed the 12-volt battery was failing and causing low system voltage. CORRECTION Remove and replace 12-volt battery. Clear brake-system DTCs and verify normal brake-actuator operation.

CUSTOMER CONCERN Customer states the ABS and brake warning lights are on and the ABS pump runs repeatedly. DTC C1391 is stored. CAUSE No external brake-fluid leak was found, and accumulator pressure dropped after pump shutdown, confirming internal brake-actuator leakage. CORRECTION Remove and replace ABS brake actuator assembly. Perform actuator initialization and brake-system bleed. Clear DTC C1391.

CUSTOMER CONCERN Customer states brake pressure was lost at the right rear after rear brake and caliper replacement, and conventional bleeding did not restore the pedal. CAUSE Air remained trapped in the electronically controlled brake system and the hydraulic pump required scan-tool activation. CORRECTION Operate brake pump and perform complete hybrid ABS bleed procedure with a compatible scan tool. Verify brake-pedal pressure.