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Home >> Lexus >> 2019 >> LC 500 >> Repair and Diagnosis (Single Page) >> Steering >> Manual Steering >> Variable Gear Ratio Steering System - Diagnostic Codes & Symptom Tests (Coupe) >> Variable Gear Ratio Steering System >> DTC U0100-56: Lost Communication with ECM / PCM "A"; DTC U0101-56: Lost Communication with TCM; DTC U0125-56: Lost Communication with Yaw Rate Sensor Module; DTC U0126-56: Lost Communication with Steering Angle Sensor Module; DTC U0129-56: Lost Communication with Brake System Control Module; DTC U0131-56: Lost Communication with Power Steering Control Module; DTC U0134-56: Lost Communication with DRS Module [03/2017 - 09/2018] >> Description
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DTC U0100-56: Lost Communication with ECM / PCM "A"; DTC U0101-56: Lost Communication with TCM; DTC U0125-56: Lost Communication with Yaw Rate Sensor Module; DTC U0126-56: Lost Communication with Steering Angle Sensor Module; DTC U0129-56: Lost Communication with Brake System Control Module; DTC U0131-56: Lost Communication with Power Steering Control Module; DTC U0134-56: Lost Communication with DRS Module [03/2017 - 09/2018]: Description

The VGRS ECU (front steering control ECU) receives signals from the ECM, skid control ECU assembly, yaw rate sensor, steering sensor, rack and pinion power steering gear assembly and DRS ECU (rear steering control ECU) via CAN communication. When DTCs indicating a CAN communication system malfunction are output, repair the CAN communication system first.

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Return-to-normal Condition
U0100/56 Lost Communication with ECM / PCM "A" All conditions are met:
  • 1 second or more elapse after turning the engine switch on (IG).
  • Power source voltage at 10 to 16 V.
  • The signal from the ECM is lost for approximately 3 seconds or more.
  • ECM
  • CAN communication system
 Comes on Engine switch on (IG) again
U0101/56 Lost Communication with TCM All conditions are met:
  • 1 second or more elapse after turning the engine switch on (IG).
  • Power source voltage at 10 to 16 V.
  • The signal from the ECM is lost for approximately 12 seconds or more.
  • ECM
  • CAN communication system
 Comes on Engine switch on (IG) again
U0125/56 Lost Communication with Yaw Rate Sensor Module All conditions are met:
  • 1 second or more elapse after turning the engine switch on (IG).
  • Power source voltage at 10 to 16 V.
  • The signal from the yaw rate sensor is lost for approximately 12 seconds or more.
  • Yaw rate sensor
  • CAN communication system
 Comes on Engine switch on (IG) again
U0126/56 Lost Communication with Steering Angle Sensor Module All conditions are met:
  • 1 second or more elapse after turning the engine switch on (IG).
  • Power source voltage at 10 to 16 V.
  • The signal from the steering sensor is lost for approximately 3 seconds or more.
  • Steering sensor
  • CAN communication system
 Comes on Engine switch on (IG) again
U0129/56 Lost Communication with Brake System Control Module All conditions are met:
  • 1 second or more elapse after turning the engine switch on (IG).
  • Power source voltage at 10 to 16 V.
  • The signal from the skid control ECU assembly is lost for approximately 3 seconds or more.
  • Skid control ECU assembly
  • CAN communication system
 Comes on Engine switch on (IG) again
U0131/56 Lost Communication with Power Steering Control Module All conditions are met:
  • 1 second or more elapse after turning the engine switch on (IG).
  • Power source voltage at 10 to 16 V.
  • The signal from the rack and pinion power steering gear assembly is lost for approximately 3 seconds or more.
  • Rack and pinion power steering gear assembly
  • CAN communication system
 Comes on Engine switch on (IG) again
U0134/56 Lost Communication with DRS Module All conditions are met:
  • 1 second or more elapse after turning the engine switch on (IG).
  • Power source voltage at 10 to 16 V.
  • The signal from the DRS ECU (rear steering control ECU) is lost for approximately 3 seconds or more.
  • DRS ECU (rear steering control ECU)
  • CAN communication system
 Comes on Engine switch on (IG) again
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