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Home >> Lexus >> 2018 >> LC 500 >> Repair and Diagnosis (Single Page) >> Steering >> Manual Steering >> Power Steering System - Diagnostic Codes & Circuit Tests (Coupe) >> 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 U0130: Lost Communication with Steering Effort Control Module; DTC U0134: Lost Communication with DRS Module; DTC U023A: Lost Communication with Front Camera Module [03/2017 - ] >> 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 U0130: Lost Communication with Steering Effort Control Module; DTC U0134: Lost Communication with DRS Module; DTC U023A: Lost Communication with Front Camera Module [03/2017 - ]: Description

The power steering ECU (rack and pinion power steering gear assembly) receives signals from the ECM, steering sensor, skid control ECU assembly, VGRS ECU (front steering control ECU)*, DRS ECU (rear steering control ECU)*, and forward recognition camera via CAN communication.

  1. *: w/ Variable Gear Ratio Steering System
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
  • ECM
  • CAN communication system
  • Rack and pinion power steering gear assembly
EPS warning light: Does not come on After the CAN communication returns to normal -
U0126 Lost Communication with Steering Angle Sensor Module Lost communication with steering sensor
  • Steering sensor
  • CAN communication system
  • Rack and pinion power steering gear assembly
EPS warning light: Comes on After the CAN communication returns to normal -
U0129 Lost Communication with Brake System Control Module Lost communication with skid control ECU assembly
  • skid control ECU assembly
  • CAN communication system
  • Rack and pinion power steering gear assembly
EPS warning light: Comes on After the CAN communication returns to normal -
U0130 Lost Communication with Steering Effort Control Module Lost communication with steering control ECU FR
  • VGRS ECU (front steering control ECU)
  • CAN communication system
  • Rack and pinion power steering gear assembly
EPS warning light: Comes on After the CAN communication returns to normal -
U0134 Lost Communication with DRS Module Lost communication with steering control ECU RR
  • DRS ECU (rear steering control ECU)
  • CAN communication system
  • Rack and pinion power steering gear assembly
EPS warning light: Does not come on After the CAN communication returns to normal -
U023A Lost Communication with Front Camera Module Lost communication with forward recognition camera
  • Forward recognition camera
  • CAN communication system
  • Rack and pinion power steering gear assembly
EPS warning light: Does not come on After the CAN communication returns to normal -