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Home >> Lexus >> 2019 >> UX 250h Base >> Repair and Diagnosis (Single Page) >> Steering >> Manual Steering >> Power Steering System (Diagnostic Codes & Symptom Tests) >> Power Steering System >> DTC U0100: Lost Communication With ECM/PCM "A"; 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 [10/2018 - 07/2022] >> Description
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DTC U0100: Lost Communication With ECM/PCM "A"; 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 [10/2018 - 07/2022]: Description

The power steering ECU with motor assembly receives signals from the skid control ECU (brake booster with master cylinder assembly)*1 or skid control ECU (brake actuator assembly)*2, forward recognition camera and hybrid vehicle control ECU*1 or ECM*2 via CAN communication.

  1. *1: for HV Model
  2. *2: for Gasoline Model
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
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 Gasoline Model
U0129 Lost Communication with Brake System Control Module Lost communication with skid control ECU (brake booster with master cylinder assembly)*1 or skid control ECU (brake actuator assembly)*2
  • CAN communication system
  • Skid control ECU (brake booster with master cylinder assembly)*1
  • Skid control ECU (brake actuator assembly)*2
EPS warning light: Comes on The ECU judges the system has returned to normal or the ignition switch is turned ON again -
U023A Lost Communication with Front Camera Module Lost communication with forward recognition camera
  • CAN communication system
  • Forward recognition camera
EPS warning light: Does not come on The ECU judges the system has returned to normal or the ignition switch is turned ON again -
U0293 Lost Communication with Hybrid Control Module Lost communication with hybrid vehicle control ECU
  • CAN communication system
  • Hybrid vehicle control ECU
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
  1. *1: for HV Model
  2. *2: for Gasoline Model