CUSTOMER CONCERN After front-bumper and parking-sensor replacement, DTC C1AEC sets for a front ultrasonic-sensor communication fault. CAUSE The replacement front ultrasonic sensors had not been initialized, leaving the parking-assist system in an unconfigured state. CORRECTION Initialize the No. 1 and No. 2 front ultrasonic sensors with the OE scan tool, clear DTC C1AEC, and verify normal front parking-assist operation.

CUSTOMER CONCERN READY mode intermittently fails, the navigation display flickers, and DTCs P3000, C1545, B1585, B1551, and B15F9 are stored. CAUSE The key-fob battery was too weak for reliable smart-key recognition, producing intermittent startup and electrical symptoms. CORRECTION Remove and replace the key-fob battery, clear the stored DTCs, and verify consistent smart-key recognition, READY mode, and navigation-display operation.

CUSTOMER CONCERN Vehicle is towed in with a no-start condition and Hybrid Battery Voltage System Isolation Fault DTC P0AA6. CAUSE The electric A/C compressor had an internal high-voltage isolation fault. CORRECTION Disable the high-voltage system, remove and replace the electric A/C compressor, clear DTC P0AA6, and verify isolation resistance and READY operation.

CUSTOMER CONCERN Lean-condition faults are present and measured fuel pressure is only 15 psi. CAUSE The in-tank fuel-pump seal was torn, allowing the pump to draw air and produce insufficient fuel pressure. CORRECTION Remove and replace the fuel-pump module and damaged seal, clear the lean-condition DTCs, and verify normal fuel pressure and engine operation.

CUSTOMER CONCERN After brake service, hydraulic-system DTCs C1341, C1342, C1343 and C1344 are stored. CAUSE Air remained in the electronically controlled brake hydraulic system after the brake job. CORRECTION Perform the scan-tool-assisted brake bleeding procedure, clear C1341 through C1344, and verify normal brake-pedal feel and hydraulic-system operation.

CUSTOMER CONCERN Customer reports multiple ABS warning lights illuminated with DTC C1391. The pump and accumulator assembly had been replaced previously, but the warning lights and code returned after approximately 200 miles. CAUSE Diagnosis confirmed an internal leak and failure in the ABS actuator and electronic control unit. The accumulator pressure did not remain within specification, causing C1391 to reset after the separate pump and accumulator repair. CORRECTION Remove