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Home >> Toyota >> 2021 >> Highlander LE, FWD >> Repair and Diagnosis (Single Page) >> Steering >> Power Steering >> Power Steering System - Diagnostic Codes & Circuit Tests >> Power Steering System >> DTC U0100: Lost Communication with ECM / PCM "A"; DTC U0126: Lost Communication With Steering Angle Sensor Module; DTC U0129: Lost Communication with Brake System Control Module; DTC U023A: Lost Communication with Front Camera Module; DTC U0293: Lost Communication with Hybrid Control Module [12/2019 - 11/2023] >> Description
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DTC U0100: Lost Communication with ECM / PCM "A"; DTC U0126: Lost Communication With Steering Angle Sensor Module; DTC U0129: Lost Communication with Brake System Control Module; DTC U023A: Lost Communication with Front Camera Module; DTC U0293: Lost Communication with Hybrid Control Module [12/2019 - 11/2023]: Description

for Gasoline Model: 

  1. The power steering ECU (rack and pinion power steering gear assembly) receives signals from the ECM, steering sensor, skid control ECU (brake actuator assembly) and forward recognition camera via CAN communication.

for HV Model: 

  1. The power steering ECU (rack and pinion power steering gear assembly) receives signals from the hybrid vehicle control ECU, steering sensor, No. 2 skid control ECU (brake actuator assembly) and forward recognition camera via CAN communication.
DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Return-to-normal Condition Note
U0100 Lost Communication with ECM / PCM "A" Lost communication with ECM
  • CAN communication system
  • ECM
  • Rack and pinion power steering gear assembly
 EPS warning light: When an error occurs during steering assist, the warning light does not illuminate. For errors that occur before assist (at the time of the decision to start assist), the warning light illuminates. The ECU judges the system has returned to normal for Gasoline Model
U0126 Lost Communication With Steering Angle Sensor Module Lost communication with steering angle sensor
  • CAN communication system
  • Steering sensor
  • Rack and pinion power steering gear assembly
 EPS warning light: Comes on The ECU judges the system has returned to normal -
U0129 Lost Communication with Brake System Control Module for Gasoline Model: 
  1. Lost communication with skid control ECU (brake actuator assembly)

for HV Model: 

  1. Lost communication with No. 2 skid control ECU (brake actuator assembly)
 for Gasoline Model: 
  • CAN communication system
  • Skid control ECU (Brake actuator assembly)
  • Rack and pinion power steering gear assembly

for HV Model: 

  • CAN communication system
  • No. 2 skid control ECU (Brake actuator assembly)
  • Rack and pinion power steering gear assembly
 EPS warning light: Comes on The ECU judges the system has returned to normal -
U023A Lost Communication with Front Camera Module Lost communication with forward recognition camera
  • CAN communication system
  • Forward recognition camera
  • Rack and pinion power steering gear assembly
 EPS warning light: Does not come on The ECU judges the system has returned to normal -
U0293 Lost Communication with Hybrid Control Module Lost communication with hybrid vehicle control ECU
  • CAN communication system
  • Hybrid vehicle control ECU
  • Rack and pinion power steering gear assembly
 EPS warning light: Does not come on The ECU judges the system has returned to normal or the ignition switch is turned ON again for HV Model
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