CUSTOMER CONCERN The vehicle was towed in with a no-start condition and DTC P0AA6 for a high-voltage isolation fault. CAUSE The 12-volt auxiliary battery measured only 8.3 volts and would not retain a charge; the confirmed report also found sleep-current draw at approximately 0.03 mA. CORRECTION Remove and replace the failed 12-volt auxiliary battery, clear DTC P0AA6, and verify the vehicle enters READY mode normally.

CUSTOMER CONCERN After collision repairs, the dash displays a message to clean the parking sensors even though the sensors are clean. CAUSE The repaired rear parking-aid sensors were out of calibration after the bumper work. CORRECTION Calibrate the parking-aid sensors and verify the false clean-sensor message no longer appears and parking-assist operation is normal.

CUSTOMER CONCERN Warning lights come on intermittently and DTC P261B sets because engine water-pump speed is below the commanded value. CAUSE A defective aftermarket electric engine water pump could not maintain the commanded pump speed. CORRECTION Remove and replace the defective aftermarket electric water pump with an OEM-quality pump, clear DTC P261B, and verify commanded and actual pump speed remain consistent.

CUSTOMER CONCERN A 12-volt battery warning appears, the vehicle will not drive, and DTC P300000 is stored for hybrid battery discharge control. CAUSE The confirmed repair identified a failed 12-volt auxiliary battery. CORRECTION Remove and replace the failed 12-volt auxiliary battery, clear DTC P300000, and verify the vehicle enters Ready mode and drives normally.

CUSTOMER CONCERN Several instrument-panel fuse circuits have no voltage after an ignition-interlock installation. CAUSE The 50-amp J/B-B fuse in the engine-compartment fuse box was blown, removing power from multiple dash fuse circuits. CORRECTION Remove and replace the blown 50-amp J/B-B fuse and verify battery voltage is restored at the affected instrument-panel fuses.

CUSTOMER CONCERN After collision repairs, the parking-assist system stores DTCs C1AED and C1AF8 for rear sensor communication faults. CAUSE The rear intelligent-clearance sonar sensors had not been correctly aimed and registered after the collision repair. CORRECTION Perform the rear ultrasonic-sensor detection-angle procedures and intelligent-clearance sonar registration, clear DTCs C1AED and C1AF8, and verify parking-assist operation.

CUSTOMER CONCERN The check-engine light returns with DTC P05A074 for active grille shutter actuator slipping after body repairs. CAUSE The active grille shutter assembly was missing the cover cap that retains the actuator, allowing the actuator and louver mechanism to slip. CORRECTION Remove and replace the damaged active grille shutter assembly, clear DTC P05A074, and verify the shutter completes its active test without slipping.

CUSTOMER CONCERN The vehicle will not start, ignition power is present, and the scan tool cannot communicate with any control module. CAUSE Spread terminals in the data link connector prevented reliable contact with the scan-tool connector. DLC terminal 16 had battery voltage and terminals 4 and 5 had good grounds. CORRECTION Repair the spread data link connector terminals and verify the scan tool communicates with the vehicle modules and the vehicle starts normally.

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 SRS warning lamp is on with DTCs B1782 and B1650. CAUSE Scan-data seat-weight values isolated a failed left-rear occupant-classification sensor in the passenger seat assembly. CORRECTION Remove and replace the passenger-seat assembly containing the failed occupant-classification sensor, perform occupant-classification zero-point calibration, clear DTCs B1782 and B1650, and verify the SRS warning lamp remains off.

CUSTOMER CONCERN The vehicle will not enter READY mode, DTC U0142 is stored, the dash lamps dim when the brake pedal is pressed, and the remote door locks do not operate. CAUSE The 12-volt auxiliary battery was weak; applying external 12-volt support restored the door locks and allowed the vehicle to enter READY mode. CORRECTION Remove and replace the weak 12-volt auxiliary battery, clear DTC U0142, and verify READY-mode engagement, stable dash illumination, and remote door-l

CUSTOMER CONCERN After collision repairs, DTCs P0A93 and P0C73 are stored and the inverter cooling system is empty. CAUSE The inverter coolant level was left low after collision repair, allowing air into the inverter cooling circuit and preventing normal coolant-pump performance. CORRECTION Refill and bleed the inverter cooling system with a compatible scan tool, clear DTCs P0A93 and P0C73, and verify inverter-coolant-pump speed and coolant circulation.

CUSTOMER CONCERN The air conditioning does not cool and DTC B1474 indicates an A/C inverter malfunction. CAUSE High-voltage supply, DA1 connector condition, and the compressor's 12-volt power, ground, and control circuits checked good, confirming an internal electric A/C compressor failure. CORRECTION Remove and replace the failed electric A/C compressor, clear DTC B1474, and verify normal compressor communication and cooling operation.

CUSTOMER CONCERN The brake pedal remains soft after a brake-fluid flush. CAUSE Air remained in the electronically controlled brake hydraulic system because the initial bleeding method did not complete the ABS-assisted air-bleed routine. CORRECTION Perform the complete brake air-bleed procedure with Toyota Techstream, then verify a firm brake pedal and normal brake-system operation.

CUSTOMER CONCERN All turn-signal lamps flash continuously as though the hazard switch is on. CAUSE The hazard-switch input circuit was shorted through Junction Block No. 3; testing at turn-signal flasher pin 8 on the yellow wire isolated the circuit fault. CORRECTION Install a repaired overlay circuit between the hazard switch and turn-signal/hazard flasher to bypass the shorted Junction Block No. 3 path, then verify normal turn-signal and hazard-lamp operation.

CUSTOMER CONCERN After left steering-knuckle service, ABS DTC C1231 is stored and the steering-angle reading is fixed at 850 degrees. CAUSE The steering-angle sensor signal remained stuck at 850 degrees after CAN-bus, power, and ground checks, confirming a failed steering-angle sensor. CORRECTION Remove and replace the failed steering-angle sensor, perform the required steering-angle calibration, clear DTC C1231, and verify a responsive steering-angle reading and normal ABS o

CUSTOMER CONCERN The power liftgate moves manually but will not power open or close. CAUSE The power-back-door main switch in the glove box was in the bypass/off position, disabling automatic liftgate operation. CORRECTION Reposition the power-back-door main switch to enable automatic operation and verify the liftgate powers open and closed normally.

CUSTOMER CONCERN The check-engine light is on with DTC P0333 for the bank-2 knock-sensor circuit. CAUSE Rodent damage opened the knock-sensor sub-harness beneath the intake manifold; the normal sensor circuit pulls the 5-volt reference to approximately 2.5 volts, while an average above 4.5 volts sets P0333. CORRECTION Remove the intake manifold as required, remove and replace the damaged knock-sensor harness, clear DTC P0333, and verify the bank-2 knock-sensor signal and engi

CUSTOMER CONCERN The brake accumulator has low pressure, DTC C1256 is stored, and the accumulator pump does not run. CAUSE Power and ground were present at the hydraulic unit, confirming an internal brake actuator assembly failure. CORRECTION Remove and replace the failed brake actuator assembly, perform the required brake-system bleed and calibration procedures, clear DTC C1256, and verify normal accumulator-pump and brake-system operation.

CUSTOMER CONCERN DTC P2602 returns after the inverter coolant pump was replaced for a transmission oil-pump circuit fault. CAUSE Circuit checks and confirmed repair identified an internal failure of the electric transmission oil pump, not the inverter coolant pump. CORRECTION Remove and replace the failed transmission oil pump, clear DTC P2602, and verify transaxle-oil circulation and normal hybrid-system operation.