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Home >> Lexus >> 2016 >> LX 570 >> Repair and Diagnosis (Single Page) >> Steering >> Power Steering >> Variable Gear Ratio Steering System - Diagnostic Codes & Symptom Tests >> Variable Gear Ratio Steering System >> DTC U0100: Lost Communication with ECM/PCM "A"; DTC U0101: Lost Communication with TCM; DTC U0125: Lost Communication with Yaw Rate Sensor Module; DTC U0126: Lost Communication with Steering Angle Sensor Module; DTC U0129: Lost Communication with Brake System Control Module [08/2020 - ] >> Description
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DTC U0100: Lost Communication with ECM/PCM "A"; DTC U0101: Lost Communication with TCM; DTC U0125: Lost Communication with Yaw Rate Sensor Module; DTC U0126: Lost Communication with Steering Angle Sensor Module; DTC U0129: Lost Communication with Brake System Control Module [08/2020 - ]: Description

The VGRS ECU (steering control ECU) receives signals from the ECM, TCM, skid control ECU (master cylinder solenoid), yaw rate sensor (airbag sensor assembly) and steering sensor via CAN communication. When DTCs indicating a CAN communication system malfunction are output, repair the CAN communication system first.

DTC No. DTC Detection Condition Trouble Area
U0100 Both conditions are met for approximately 3 seconds or more:
  • The engine switch is on (IG).
  • The signal from the ECM is lost.
  • ECM
  • CAN communication system
U0101 Both conditions are met for approximately 12 seconds or more:
  • The engine switch is on (IG).
  • The signal from the TCM is lost.
  • TCM
  • CAN communication system
U0125 Both conditions are met for approximately 12 seconds or more:
  • The engine switch is on (IG).
  • The signal from the yaw rate sensor (airbag sensor assembly) is lost.
  • Yaw rate sensor (Airbag sensor assembly)
  • CAN communication system
U0126 Both conditions are met for approximately 3 seconds or more:
  • The engine switch is on (IG).
  • The signal from the steering sensor is lost.
  • Steering sensor
  • CAN communication system
U0129 Both conditions are met for approximately 3 seconds or more:
  • The engine switch is on (IG).
  • The signal from the skid control ECU (master cylinder solenoid) is lost.
  • Skid control ECU (master cylinder solenoid)
  • CAN communication system
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