LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2020 >> UX 250h Base >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Exterior Lights >> Lighting System (Exterior) (Diagnostic Codes) (1 Of 2) >> Lighting System >> DTC U0073: Control Module Communication Bus Off; DTC U0100: Lost Communication With ECM/PCM "A"; DTC U0101: Lost Communication with TCM; DTC U0126: Lost Communication with Steering Angle Sensor Module; DTC U0129: Lost Communication with Brake System Control Module; DTC U0142: Lost Communication with Body Control Module "B"; DTC U0155: Lost Communication with Instrument Panel Cluster (IPC) Control Module; DTC U0242: Lost Communication With Headlamp Control Module "B"; DTC U0293: Lost Communication with Hybrid Control Module [10/2018 - 07/2022] >> Description
April 5, 2026: LEMON Manuals is launched! Read the announcement.

DTC U0073: Control Module Communication Bus Off; DTC U0100: Lost Communication With ECM/PCM "A"; DTC U0101: Lost Communication with TCM; DTC U0126: Lost Communication with Steering Angle Sensor Module; DTC U0129: Lost Communication with Brake System Control Module; DTC U0142: Lost Communication with Body Control Module "B"; DTC U0155: Lost Communication with Instrument Panel Cluster (IPC) Control Module; DTC U0242: Lost Communication With Headlamp Control Module "B"; DTC U0293: Lost Communication with Hybrid Control Module [10/2018 - 07/2022]: Description

These DTCs are stored if a CAN communication malfunction occurs between the headlight ECU sub-assembly LH and other ECUs.

DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from
U0073 Control Module Communication Bus Off The No. 1 headlight ECU sub-assembly LH does not send/receive data. CAN communication system No. 1 headlight ECU sub-assembly LH
U0100 Lost Communication With ECM/PCM "A" The No. 1 headlight ECU sub-assembly LH does not receive data from the ECM for approximately 10 seconds or more.
  • CAN communication system
  • ECM
  • No. 1 headlight ECU sub-assembly LH
 No. 1 headlight ECU sub-assembly LH
U0101 Lost Communication with TCM The No. 1 headlight ECU sub-assembly LH does not receive data from the hybrid vehicle control ECU (for HV Model) or ECM (for Gasoline Model) for approximately 10 seconds or more.
  • CAN communication system
  • Hybrid vehicle control ECU (for HV Model)
  • ECM (for Gasoline Model)
  • No. 1 headlight ECU sub-assembly LH
 No. 1 headlight ECU sub-assembly LH
U0126 Lost Communication with Steering Angle Sensor Module The No. 1 headlight ECU sub-assembly LH does not receive data from the steering sensor for approximately 10 seconds or more.
  • CAN communication system
  • Steering sensor
  • No. 1 headlight ECU sub-assembly LH
 No. 1 headlight ECU sub-assembly LH
U0129 Lost Communication with Brake System Control Module The No. 1 headlight ECU sub-assembly LH does not receive data from the skid control ECU (brake actuator assembly) for approximately 10 seconds or more.
  • CAN communication system
  • Skid control ECU (brake actuator assembly)
  • No. 1 headlight ECU sub-assembly LH
 No. 1 headlight ECU sub-assembly LH
U0142 Lost Communication with Body Control Module "B" The No. 1 headlight ECU sub-assembly LH does not receive data from the main body ECU (multiplex network body ECU) for approximately 10 seconds or more.
  • CAN communication system
  • Main body ECU (multiplex network body ECU)
  • No. 1 headlight ECU sub-assembly LH
 No. 1 headlight ECU sub-assembly LH
U0155 Lost Communication with Instrument Panel Cluster (IPC) Control Module The No. 1 headlight ECU sub-assembly LH does not receive data from the combination meter assembly for approximately 30 seconds or more.
  • CAN communication system
  • Combination meter assembly
  • No. 1 headlight ECU sub-assembly LH
 No. 1 headlight ECU sub-assembly LH
U0242 Lost Communication With Headlamp Control Module "B" The No. 1 headlight ECU sub-assembly LH does not receive data from the No. 1 headlight ECU sub-assembly RH for approximately 10 seconds or more.
  • CAN communication system
  • No. 1 headlight ECU sub-assembly LH
  • No. 1 headlight ECU sub-assembly RH
 No. 1 headlight ECU sub-assembly LH
U0293 Lost Communication with Hybrid Control Module The No. 1 headlight ECU sub-assembly LH does not receive data from the hybrid vehicle control ECU for approximately 10 seconds or more.
  • CAN communication system
  • Hybrid vehicle control ECU
  • No. 1 headlight ECU sub-assembly LH
 No. 1 headlight ECU sub-assembly LH
scientia non olet · About LEMON Manuals