CUSTOMER CONCERN The hybrid system stores isolation-fault DTCs P0AA6-49 and P1C80-49 for the rear motor area. CAUSE Corrosion in the high-voltage floor under-wire harness caused the documented isolation fault. CORRECTION Remove and replace the corroded high-voltage floor under-wire harness, clear DTCs P0AA6-49 and P1C80-49, and verify high-voltage isolation and hybrid-system operation.

CUSTOMER CONCERN After collision repairs and replacement of the front bumper and steering rack, the intuitive park-assist warning remains on and the EPS system stores U023A-87. CAUSE The replacement steering rack/EPS and clearance-warning system had not been fully configured, and the front ultrasonic-sensor angles had not been registered. CORRECTION Configure the EPS and clearance-warning ECU, perform front ultrasonic-sensor angle registration, clear U023A-87 and related Repo

CUSTOMER CONCERN The 12-volt battery is discharged by morning because of an overnight parasitic draw. CAUSE A leaking sunroof drain hose allowed water into the body control module, causing internal corrosion and the electrical draw. CORRECTION Remove and replace the corroded body control module and repair the leaking sunroof drain hose.

CUSTOMER CONCERN The fuel tank is difficult to fill and DTC P04B4 indicates the refueling vapor valve is stuck closed. CAUSE The normally closed EVAP canister vent solenoid remained stuck shut when commanded open, preventing vapor from leaving the tank during refueling. CORRECTION Remove and replace the failed EVAP canister vent solenoid.

CUSTOMER CONCERN Wall charging is inoperative, the cooling fan and charge-port light ring do not operate when plugged in, and DTC P0C2A resets immediately after clearing. CAUSE The transmission-fluid auxiliary-pump circuits passed testing, confirming an internal pump failure. CORRECTION Remove and replace the failed transmission-fluid auxiliary pump.

CUSTOMER CONCERN The right turn signal remains on whenever the ignition is on, while the left signal does not respond to the multifunction switch but does flash with the hazard switch; SCCM DTC B1D36:09 returns immediately. CAUSE SCCM switch data changed to OFF when the multifunction switch was removed, confirming an internal switch failure. CORRECTION Remove and replace the failed multifunction switch.

CUSTOMER CONCERN The malfunction indicator lamp is on with DTC P0401 for insufficient EGR flow. CAUSE The EGR cooler was restricted and could not provide the commanded exhaust-gas flow. CORRECTION Remove and replace the restricted EGR cooler.

CUSTOMER CONCERN The IHKA heating and air-conditioning system is inoperative and multiple IHKA faults are stored. CAUSE The heat-pump control module failed after the related sensor, shutoff-valve, and wiring checks. CORRECTION Remove and replace the failed heat-pump control module, then program and code the replacement module to the vehicle.

CUSTOMER CONCERN The check-engine light returns with DTC P219A for a bank-one air/fuel imbalance, but the vehicle has no obvious drivability complaint and prior plug and vacuum-leak checks found no fault. CAUSE Restricted EGR passages in the intake manifold created uneven exhaust-gas distribution between cylinders. CORRECTION Remove the intake manifold and EGR tube, clean the restricted EGR passages, and replace the intake-manifold gaskets as documented in the confirmed repai

CUSTOMER CONCERN After an extended drive, the warning light returns with DTCs P0117, P148F, and P261B even though the engine-coolant level is full and the system has been bled. CAUSE The engine electric water pump failed to maintain commanded rotation speed despite the supported power, ground, and control/feedback circuit checks. CORRECTION Remove and replace the failed engine electric water pump.

CUSTOMER CONCERN After engine installation, the engine runs only while a scan tool is connected and DTCs P0032, C1259, C1310, and U0100 are present. CAUSE The D1 engine-control-module ground at the valve cover was loose, interrupting the ECM ground path. CORRECTION Tighten and secure the D1 ECM ground connection at the valve cover.

CUSTOMER CONCERN After a 12-volt battery was installed and several fuses opened, the vehicle has no electrical power even after the smaller fuses were replaced. CAUSE The 140-amp main fuse in the fusible-link box at the 12-volt battery was open. CORRECTION Remove and replace the open 140-amp main fuse.

CUSTOMER CONCERN DTC C1231 repeatedly returns after curb-impact steering and suspension repairs, even after steering-angle calibration. CAUSE The confirmed repair identified a failed steering-angle sensor after power, ground, CAN communication, and calibration checks. CORRECTION Remove and replace the failed steering-angle sensor and perform the supported steering/yaw-rate calibration.

CUSTOMER CONCERN The windshield wipers operate normally on high speed but move extremely slowly on low speed; replacing the wiper switch did not change the symptom. CAUSE The low-speed circuit remained powered, but the confirmed repair identified an internally failed front wiper motor. CORRECTION Remove and replace the failed front wiper motor.

CUSTOMER CONCERN DTC C1231 returns immediately after clearing for a steering-angle-sensor fault. CAUSE The steering angle sensor failed after its battery feeds, ground, and CAN circuits were identified as the required checks. CORRECTION Remove and replace the failed steering angle sensor, perform the required steering-angle calibration, clear DTC C1231, and verify the code does not return.

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 The ECM stores EVAP DTCs P043E, P043F, P2401, P2402, P2419, and P0456 at the same time. CAUSE The leak-detection pump in the evaporative-emissions system failed. CORRECTION Remove and replace the failed leak-detection pump, clear the EVAP DTCs, and verify the EVAP monitor completes without resetting P043E, P043F, P2401, P2402, P2419, or P0456.

CUSTOMER CONCERN The cooling fans continue running with the ignition off and DTC C1378 is stored. CAUSE Corrosion at the brake-control power-supply connector backfed voltage through the A/C No. 2 fuse circuit and kept the fan relays energized. CORRECTION Repair the corroded brake-control power-supply connector and terminals, clear DTC C1378, and verify the cooling fans shut off normally with the ignition off.

CUSTOMER CONCERN After an oil change and repeated maintenance-reminder reset attempts, the vehicle will not start although the combination meter and brake lamps operate. CAUSE The 12-volt battery became too weak to power the hybrid control system during the extended reset attempt. CORRECTION Remove and replace the weak 12-volt battery and verify normal READY mode and vehicle startup.

CUSTOMER CONCERN A clunk and shudder comes from the right-front wheel during low-speed braking just before the vehicle stops. CAUSE The front brake pads caused the vibration; moving the pads side to side changed the symptom and isolated it to the base brake system. CORRECTION Remove and replace the front brake pads and verify smooth, noise-free braking during repeated low-speed stops.