Diagnostic Trouble Code Chart [10/2020 - 07/2022]

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2024 Lexus UX 250h, 2023 Lexus UX 250h, 2022 Lexus UX 250h, 2021 Lexus UX 250h, and 2020 Lexus UX 250h. However, it is still accessible from the selected car via links, so may be relevant.

AIR CONDITIONING SYSTEM (FOR HV MODEL)

DTC No.	Detection Item	DTC Detection Condition	Link
B1279	Lost Communication with Humidity/Rain Sensor LIN	Lost communication with air conditioning thermistor assembly	Refer to DTC B1279: Lost Communication with Humidity/Rain Sensor LIN [10/2020 - ]
B1411	Room Temperature Sensor Circuit	Open in room temperature sensor circuit Short in room temperature sensor circuit	Refer to DTC B1411: Room Temperature Sensor Circuit [10/2018 - ]
B1412	Ambient Temperature Sensor Circuit	Open in ambient temperature sensor circuit Short in ambient temperature sensor circuit	Refer to DTC B1412: Ambient Temperature Sensor Circuit [10/2018 - ]
B1413	Evaporator Temperature Circuit or Evaporator Fin Thermistor	Open in evaporator temperature sensor circuit Short in evaporator temperature sensor circuit	Refer to DTC B1413: Evaporator Temperature Circuit or Evaporator Fin Thermistor [10/2018 - ]
B1423	Open in Pressure Sensor Circuit / Abnormal Refrigerant Pressure	Open in air conditioner pressure sensor circuit Short in air conditioner pressure sensor circuit Refrigerant pressure on high pressure side is extremely low (176 kPa (1.8 kgf/cm² , 26 psi) or less) or extremely high (3025 kPa (30.8 kgf cm² , 439 psi) or more)	Refer to DTC B1423: Open in Pressure Sensor Circuit / Abnormal Refrigerant Pressure [10/2018 - 07/2022]
B1441	Air Mix Damper Control Servo Motor Circuit (Passenger Side)	Air mix damper position sensor value is abnormal even if air conditioning amplifier assembly operates No. 1 air conditioning radiator damper servo sub-assembly (front passenger side air mix)	Refer to DTC B1441: Air Mix Damper Control Servo Motor Circuit (Passenger Side); DTC B1446: Air Mix Damper Control Servo Motor Circuit (Driver Side) [10/2020 - ]
B1442	Air Inlet Damper Control Servo Motor	Air inlet damper position sensor value is abnormal even if air conditioning amplifier assembly operates No. 1 blower damper servo sub-assembly	Refer to DTC B1442: Air Inlet Damper Control Servo Motor [10/2018 - ]
B1443	Air Outlet Damper Control Servo Motor Circuit	Air outlet damper position sensor value does not change even if air conditioning amplifier assembly operates No. 1 air conditioning radiator damper servo sub-assembly (mode)	Refer to DTC B1443: Air Outlet Damper Control Servo Motor Circuit [10/2020 - ]
B1446	Air Mix Damper Control Servo Motor Circuit (Driver Side)	Air mix damper position sensor value is abnormal even if air conditioning amplifier assembly operates No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix)	Refer to DTC B1441: Air Mix Damper Control Servo Motor Circuit (Passenger Side); DTC B1446: Air Mix Damper Control Servo Motor Circuit (Driver Side) [10/2020 - ]
B1449	Air Outlet Damper Control Servo Motor Circuit (Rear)	Air outlet damper position sensor value is abnormal even if air conditioning amplifier assembly operates No. 2 air conditioning radiator damper servo sub-assembly	Refer to DTC B1449: Air Outlet Damper Control Servo Motor Circuit (Rear) [10/2020 - ]
B1471	A/C Inverter High Voltage Power Resource System	Open in A/C inverter high voltage power resource system Short in A/C inverter high voltage power resource system Boost inverter malfunctioning	Refer to DTC B1471: A/C Inverter High Voltage Power Resource System [10/2018 - ]
B1472	A/C Inverter High Voltage Output System	Open in A/C inverter high voltage output circuit Short in A/C inverter high voltage output circuit	Refer to DTC B1472: A/C Inverter High Voltage Output System [10/2018 - ]
B1473	A/C Inverter Start-up Signal System	Open in A/C inverter start-up signal circuit Short in A/C inverter start-up signal circuit	Refer to DTC B1473: A/C Inverter Start-up Signal System [10/2018 - ]
B1474	A/C Inverter	A/C inverter malfunction	Refer to DTC B1474: A/C Inverter [10/2018 - ]
B1475	A/C Inverter Cooling / Heating System	A/C inverter temperature outside specified range (temperature too high) Open to ground in temperature sensor circuit Short to ground in temperature sensor circuit	Refer to DTC B1475: A/C Inverter Cooling / Heating System [10/2018 - 07/2022]
B1476	A/C Inverter Load System	Motor rotation load while compressor is operating is too large Motor rotation load while compressor is operating is too small	Refer to DTC B1476: A/C Inverter Load System [10/2018 - 07/2022]
B1477	A/C Inverter Low Voltage Power Resource System	Open to ground in inverter control power voltage circuit Short to ground in inverter control power voltage circuit	Refer to DTC B1477: A/C Inverter Low Voltage Power Resource System [10/2018 - ]
B1497	Communication Malfunction (Bus Ic)	Error in communication line Open in communication line	Refer to DTC B1497: Communication Malfunction (Bus Ic) [10/2020 - ]
B1498	Communication Malfunction (A/C Inverter Local)	Error in communication line between the hybrid vehicle control ECU and compressor with motor assembly Open in communication line between the hybrid vehicle control ECU and compressor with motor assembly High-voltage power source shut off	Refer to DTC B1498: Communication Malfunction (A/C Inverter Local) [10/2018 - ]
B14B2	Lost Communication with Front Panel LIN	Lost communication with air conditioning control assembly	Refer to DTC B14B2: Lost Communication with Front Panel LIN [10/2018 - 07/2022]
B14B8	Refrigerant Shortage	The following condition is detected in the normal operation refrigerant shortage check: Amount of refrigerant is insufficient	Refer to DTC B14B8: Refrigerant Shortage [10/2018 - 07/2022]
P1C7C-49	Hybrid/EV Battery Voltage System Isolation (A/C Area) Internal Electronic Failure	High voltage system insulation malfunction	Refer to DTC P1C7C-49: Hybrid/EV Battery Voltage System Isolation (A/C Area) Internal Electronic Failure [10/2018 - 07/2022]
U0100	Lost Communication With ECM/PCM "A"	No communication with ECM	Refer to DTC U0100: Lost Communication With ECM/PCM "A"; DTC U0131: Lost Communication With Power Steering Control Module; DTC U0142: Lost Communication With Body Control Module "B"; DTC U0151: Lost Communication With Restraints Control Module; DTC U0155: Lost Communication With Instrument Panel Cluster (IPC) Control Module; DTC U0163: Lost Communication With Navigation Control Module; DTC U0293: Lost Communication with HV ECU [10/2018 - 07/2022]
U0131	Lost Communication With Power Steering Control Module	No communication with power steering ECU with motor assembly	Refer to DTC U0100: Lost Communication With ECM/PCM "A"; DTC U0131: Lost Communication With Power Steering Control Module; DTC U0142: Lost Communication With Body Control Module "B"; DTC U0151: Lost Communication With Restraints Control Module; DTC U0155: Lost Communication With Instrument Panel Cluster (IPC) Control Module; DTC U0163: Lost Communication With Navigation Control Module; DTC U0293: Lost Communication with HV ECU [10/2018 - 07/2022]
U0142	Lost Communication With Body Control Module "B"	No communication with main body ECU (multiplex network body ECU)	Refer to DTC U0100: Lost Communication With ECM/PCM "A"; DTC U0131: Lost Communication With Power Steering Control Module; DTC U0142: Lost Communication With Body Control Module "B"; DTC U0151: Lost Communication With Restraints Control Module; DTC U0155: Lost Communication With Instrument Panel Cluster (IPC) Control Module; DTC U0163: Lost Communication With Navigation Control Module; DTC U0293: Lost Communication with HV ECU [10/2018 - 07/2022]
U0151	Lost Communication With Restraints Control Module	No communication with airbag ECU assembly	Refer to DTC U0100: Lost Communication With ECM/PCM "A"; DTC U0131: Lost Communication With Power Steering Control Module; DTC U0142: Lost Communication With Body Control Module "B"; DTC U0151: Lost Communication With Restraints Control Module; DTC U0155: Lost Communication With Instrument Panel Cluster (IPC) Control Module; DTC U0163: Lost Communication With Navigation Control Module; DTC U0293: Lost Communication with HV ECU [10/2018 - 07/2022]
U0155	Lost Communication With Instrument Panel Cluster (IPC) Control Module	No communication with combination meter assembly	Refer to DTC U0100: Lost Communication With ECM/PCM "A"; DTC U0131: Lost Communication With Power Steering Control Module; DTC U0142: Lost Communication With Body Control Module "B"; DTC U0151: Lost Communication With Restraints Control Module; DTC U0155: Lost Communication With Instrument Panel Cluster (IPC) Control Module; DTC U0163: Lost Communication With Navigation Control Module; DTC U0293: Lost Communication with HV ECU [10/2018 - 07/2022]
U0163	Lost Communication With Navigation Control Module	No communication with radio receiver assembly	Refer to DTC U0100: Lost Communication With ECM/PCM "A"; DTC U0131: Lost Communication With Power Steering Control Module; DTC U0142: Lost Communication With Body Control Module "B"; DTC U0151: Lost Communication With Restraints Control Module; DTC U0155: Lost Communication With Instrument Panel Cluster (IPC) Control Module; DTC U0163: Lost Communication With Navigation Control Module; DTC U0293: Lost Communication with HV ECU [10/2018 - 07/2022]
U0293	Lost Communication with HV ECU	No communication with hybrid vehicle control ECU	Refer to DTC U0100: Lost Communication With ECM/PCM "A"; DTC U0131: Lost Communication With Power Steering Control Module; DTC U0142: Lost Communication With Body Control Module "B"; DTC U0151: Lost Communication With Restraints Control Module; DTC U0155: Lost Communication With Instrument Panel Cluster (IPC) Control Module; DTC U0163: Lost Communication With Navigation Control Module; DTC U0293: Lost Communication with HV ECU [10/2018 - 07/2022]