Hybrid Vehicles

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 engine control module stores DTC P2681-15 for the coolant-flow control circuit. CAUSE The confirmed repair identified a failed coolant flow control valve; Toyota's updated valve was specified for the condition. CORRECTION Remove and replace the failed coolant flow control valve with the updated Toyota unit, clear DTC P2681-15, and verify coolant-flow control operation.

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 DTC C051D54 sets after rear brake-pad service. CAUSE The multi-axis acceleration sensor zero-point calibration was missing after the rear brake service. CORRECTION Perform the acceleration-sensor zero-point calibration, clear DTC C051D54, and verify normal brake-system operation.

CUSTOMER CONCERN The check-engine light is on with EVAP system DTCs P043E, P043F, P2401, P2402, and P2419. CAUSE The confirmed repair identified a failed charcoal canister assembly containing the EVAP leak-detection pump. CORRECTION Remove and replace the charcoal canister assembly, clear DTCs P043E, P043F, P2401, P2402, and P2419, and verify normal EVAP system operation.

CUSTOMER CONCERN The vehicle will not power up or start. The 12-volt battery tests good, but voltage is low at the underhood jump terminal. CAUSE The stud at No. 3 short connector A90/Y7 was loose, creating excessive resistance and a voltage drop between the 12-volt battery and underhood power distribution. CORRECTION Repair and secure the loose stud at No. 3 short connector A90/Y7, then verify full battery voltage at the underhood jump terminal and normal Ready-mode operatio

CUSTOMER CONCERN The sunroof intermittently opens by itself while the ignition is off. CAUSE Blocked sunroof drains allowed water into the moon-roof control unit, causing internal corrosion and unintended roof operation. CORRECTION Remove and replace the corroded moon-roof control unit, clear the blocked sunroof drains, and verify the roof remains closed with the ignition off and operates normally on command.

CUSTOMER CONCERN After collision damage and grille-shutter replacement, the system reports that initialization is incomplete; the original fault was P059F73 for a shutter stuck closed. CAUSE The replacement active grille shutter had not completed its required initialization. CORRECTION Place the grille-shutter system in normal run mode, cycle the ignition to complete active grille shutter initialization, clear the stored fault, and verify normal shutter operation.

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 The check-engine light is on with DTC P0441 for incorrect EVAP purge flow. CAUSE The confirmed repair identified a failed canister purge control solenoid valve. CORRECTION Remove and replace the failed canister purge control solenoid valve, clear DTC P0441, and verify the EVAP monitor completes without resetting the code.

CUSTOMER CONCERN The air conditioning blows cold with the gasoline engine off but stops cooling when the engine runs. CAUSE The confirmed repair identified lost air-conditioning servomotor initialization as the cause of the temperature-control problem. CORRECTION Perform the air-conditioning servomotor initialization with the scan tool and verify cold air is maintained with the gasoline engine both off and running.

CUSTOMER CONCERN The vehicle intermittently will not enter Ready mode even though the instrument cluster illuminates. Cycling the start switch four or five times eventually allows it to start, and no DTCs are stored. CAUSE The confirmed repair identified a failed high-voltage battery pack as the source of the intermittent no-Ready condition. CORRECTION Remove and replace the failed high-voltage battery pack and verify the vehicle enters Ready mode consistently through repeate

CUSTOMER CONCERN The fuel door intermittently will not open and the fuel tank is difficult to fill. CAUSE The charcoal canister was restricted, preventing the fuel tank from venting normally before the fuel door opened and during refueling. CORRECTION Remove and replace the restricted charcoal canister and verify the fuel door opens normally and the tank accepts fuel without restriction.