DSD Information System
Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Accessories & Equipment >> Headlights >> Lighting System (W/O AFS) - Diagnostic Codes, Symptom Tests & Circuit Tests (1 Of 2) >> LIGHTING SYSTEM (w/o AFS) >> DTC U0100: Lost Communication With ECM/PCM "A"; DTC U0101: Lost Communication with TCM; DTC U0120: Lost Communication With Starter / Generator Control Module; DTC U0126: Lost Communication with Steering Angle Sensor Module; DTC U0129: Lost Communication with Brake System Control Module; 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 U0164: Lost Communication with HVAC Control Module; DTC U0199: Lost Communication with "Door Control Module A"; DTC U0200: Lost Communication with "Door Control Module B"; DTC U0208: Lost Communication with "Seat Control Module A"; DTC U0230: Lost Communication with Rear Gate Module; DTC U023A: Lost Communication With Image Processing Module "A"; DTC U0293: Lost Communication With Hybrid Powertrain Control Module; DTC U0327: Software Incompatibility with Vehicle Security Control Module; DTC U1103: Lost Communication with Stop and Start Control Module; DTC U1106: Lost Communication with Electric Parking Brake Module [12/2019 - 11/2023] >> Description

DTC U0100: Lost Communication With ECM/PCM "A"; DTC U0101: Lost Communication with TCM; DTC U0120: Lost Communication With Starter / Generator Control Module; DTC U0126: Lost Communication with Steering Angle Sensor Module; DTC U0129: Lost Communication with Brake System Control Module; 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 U0164: Lost Communication with HVAC Control Module; DTC U0199: Lost Communication with "Door Control Module A"; DTC U0200: Lost Communication with "Door Control Module B"; DTC U0208: Lost Communication with "Seat Control Module A"; DTC U0230: Lost Communication with Rear Gate Module; DTC U023A: Lost Communication With Image Processing Module "A"; DTC U0293: Lost Communication With Hybrid Powertrain Control Module; DTC U0327: Software Incompatibility with Vehicle Security Control Module; DTC U1103: Lost Communication with Stop and Start Control Module; DTC U1106: Lost Communication with Electric Parking Brake Module [12/2019 - 11/2023]: Description

These DTCs are stored if a CAN communication malfunction occurs between the main body ECU (multiplex network body ECU) and other ECUs.

DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from
U0100 Lost Communication With ECM/PCM "A" The main body ECU (multiplex network body ECU) does not receive data from the ECM for approximately 10 seconds or more.
  • CAN communication system
  • ECM
 Main Body
U0101 Lost Communication with TCM For HV Model: 
  1. The main body ECU (multiplex network body ECU) does not receive data from the hybrid vehicle control ECU for approximately 10 seconds or more.

For Gasoline Model: 

  1. The main body ECU (multiplex network body ECU) does not receive data from the ECM for approximately 10 seconds or more.
 For HV Model: 
  • CAN communication system
  • Hybrid vehicle control ECU

For Gasoline Model: 

  • CAN communication system
  • ECM
 Main Body
U0120 Lost Communication With Starter / Generator Control Module The main body ECU (multiplex network body ECU) does not receive data from the certification ECU (smart key ECU assembly) for approximately 10 seconds or more.
  • CAN communication system
  • Certification ECU (smart key ECU assembly)
 Main Body
U0126 Lost Communication with Steering Angle Sensor Module The main body ECU (multiplex network body ECU) does not receive data from the steering sensor for approximately 10 seconds or more.
  • CAN communication system
  • Steering sensor
 Main Body
U0129 Lost Communication with Brake System Control Module For HV Model: 
  1. The main body ECU (multiplex network body ECU) does not receive data from the No. 2 skid control ECU (brake actuator assembly) for approximately 10 seconds or more.

For Gasoline Model: 

  1. The main body ECU (multiplex network body ECU) does not receive data from the skid control ECU (brake actuator assembly) for approximately 10 seconds or more.
 For HV Model: 
  • CAN communication system
  • No. 2 skid control ECU (brake actuator assembly)

For Gasoline Model: 

  • CAN communication system
  • Skid control ECU (brake actuator assembly)
 Main Body
U0151 Lost Communication with Restraints Control Module The main body ECU (multiplex network body ECU) does not receive data from the airbag sensor assembly for approximately 10 seconds or more.
  • CAN communication system
  • Airbag sensor assembly
 Main Body
U0155 Lost Communication with Instrument Panel Cluster (IPC) Control Module The main body ECU (multiplex network body ECU) does not receive data from the combination meter assembly for approximately 10 seconds or more.
  • CAN communication system
  • Combination meter assembly
 Main Body
U0163 Lost Communication with Navigation Control Module The main body ECU (multiplex network body ECU) does not receive data from the radio and display receiver assembly for approximately 10 seconds or more.
  • CAN communication system
  • Radio and display receiver assembly
 Main Body
U0164 Lost Communication with HVAC Control Module The main body ECU (multiplex network body ECU) does not receive data from the air conditioning amplifier assembly for approximately 10 seconds or more.
  • CAN communication system
  • Air conditioning amplifier assembly
 Main Body
U0199 Lost Communication with "Door Control Module A" The main body ECU (multiplex network body ECU) does not receive data from the outer mirror control ECU assembly LH for approximately 10 seconds or more.
  • CAN communication system
  • Outer mirror control ECU assembly LH
 Main Body
U0200 Lost Communication with "Door Control Module B" The main body ECU (multiplex network body ECU) does not receive data from the outer mirror control ECU assembly RH for approximately 10 seconds or more.
  • CAN communication system
  • Outer mirror control ECU assembly RH
 Main Body
U0208 Lost Communication with "Seat Control Module A" The main body ECU (multiplex network body ECU) does not receive data from the position control ECU assembly LH for approximately 10 seconds or more.
  • CAN communication system
  • Position control ECU assembly LH
 Main Body
U0230 Lost Communication with Rear Gate Module The main body ECU (multiplex network body ECU) does not receive data from the multiplex network door ECU for approximately 10 seconds or more.
  • CAN communication system
  • Multiplex network door ECU
 Main Body
U023A Lost Communication With Image Processing Module "A" The main body ECU (multiplex network body ECU) does not receive data from the forward recognition camera for approximately 10 seconds or more.
  • CAN communication system
  • Forward recognition camera
 Main Body
U0293 Lost Communication With Hybrid Powertrain Control Module The main body ECU (multiplex network body ECU) does not receive data from the hybrid vehicle control ECU for approximately 10 seconds or more.
  • CAN communication system
  • Hybrid vehicle control ECU
 Main Body
U0327 Software Incompatibility with Vehicle Security Control Module The main body ECU (multiplex network body ECU) does not receive data from the certification ECU (smart key ECU assembly) for approximately 10 seconds or more.
  • CAN communication system
  • Certification ECU (smart key ECU assembly)
 Main Body
U1103 Lost Communication with Stop and Start Control Module The main body ECU (multiplex network body ECU) does not receive data from the engine stop and start ECU for approximately 10 seconds or more.
  • CAN communication system
  • Engine stop and start ECU
 Main Body
U1106 Lost Communication with Electric Parking Brake Module For HV Model: 
  1. The main body ECU (multiplex network body ECU) does not receive data from the No. 2 skid control ECU (brake actuator assembly) for approximately 10 seconds or more.

For Gasoline Model: 

  1. The main body ECU (multiplex network body ECU) does not receive data from the skid control ECU (brake actuator assembly) for approximately 10 seconds or more.
 For HV Model: 
  • CAN communication system
  • No. 2 skid control ECU (brake actuator assembly)

For Gasoline Model: 

  • CAN communication system
  • Skid control ECU (brake actuator assembly)
 Main Body
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