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Home >> Lexus >> 2018 >> RC 350 Base, AWD >> Repair and Diagnosis (Single Page) >> Steering >> Power Steering >> Variable Gear Ratio Steering System - Diagnostic Codes & Symptom Tests >> 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 [09/2014 - 11/2017] >> Procedure
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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 [09/2014 - 11/2017]: Procedure

  1. CHECK DTC 
    1. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [09/2014 - 09/2020]

      Chassis > VGRS > Clear DTCs 

    2. Check for DTCs.

      Refer to DTC CHECK / CLEAR [09/2014 - 09/2020]

      Chassis > VGRS > Trouble Codes 

      Result

      Result Proceed to
      DTC is not output A
      DTC is output B

    Result: 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2014 - 10/2015]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2015 - 11/2017] 

    Result: 

    GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING). Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2014 - 11/2017]