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Home >> Lexus >> 2021 >> RX 350 Base, AWD >> 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 [09/2015 - ] >> 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 [09/2015 - ]: Description

The power steering ECU assembly receives signals from the ECM, skid control ECU (brake actuator assembly) and forward recognition camera (w/ forward recognition camera system) via CAN communication.

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 power switch is turned on (IG) again -
U0129 Lost Communication with Brake System Control Module Lost communication with skid control ECU (Brake actuator assembly)
  • CAN communication system
  • Skid control ECU (Brake actuator assembly)
EPS warning light: Comes on The ECU judges the system has returned to normal or the power switch is turned on (IG) again -
U023A Lost Communication with Front Camera Module Lost communication with forward recognition camera
  • CAN communication system
  • Forward recognition camera
EPS warning light: Comes on The ECU judges the system has returned to normal or the power switch is turned on (IG) again -