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Home >> Lexus >> 2021 >> NX 300 Base, AWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Collision/Avoidance >> Lane Departure Alert System (W/ Steering Control) - Diagnostic Codes & Symptom Tests >> LANE DEPARTURE ALERT SYSTEM (w/ Steering Control) >> DTC U0100: Lost Communication with ECM; DTC U0101: Lost Communication With TCM; DTC U0104: Lost Communication with Cruise Control Module; DTC U0123: 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; DTC U0131: Lost Communication with Electric Power Steering ECU; DTC U0142: Lost Communication with Body Control Module "B"; DTC U0155: Lost Communication with Instrument Panel Cluster (IPC) Control Module (Combination Meter) [10/2014 - 09/2017] >> Description
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DTC U0100: Lost Communication with ECM; DTC U0101: Lost Communication With TCM; DTC U0104: Lost Communication with Cruise Control Module; DTC U0123: 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; DTC U0131: Lost Communication with Electric Power Steering ECU; DTC U0142: Lost Communication with Body Control Module "B"; DTC U0155: Lost Communication with Instrument Panel Cluster (IPC) Control Module (Combination Meter) [10/2014 - 09/2017]: Description

These DTCs are output when a communication malfunction occurs between the sensors and ECUs.

DTC No. Detection Item DTC Detection Condition Trouble Area
U0100 Lost Communication with ECM
  • 2 seconds elapse after turning the engine switch on (IG).
  • The IG voltage is 10 V or higher.
  • 2 seconds elapse after the IG voltage is 10 V or higher.
  • While the vehicle is being driven at 1 km/h or more, the lane departure warning camera cannot receive data from the ECM continuously for 5 seconds or more.
  • CAN communication system
  • ECM
  • Lane departure warning camera
U0101 Lost Communication With TCM
  • 2 seconds elapse after turning the engine switch on (IG).
  • The IG voltage is 10 V or higher.
  • 2 seconds elapse after the IG voltage is 10 V or higher.
  • While the vehicle is being driven at 1 km/h or more, the lane departure warning camera cannot receive data from the ECM continuously for 5 seconds or more.
  • CAN communication system
  • ECM
  • Lane departure warning camera
U0104 Lost Communication with Cruise Control Module
  • 2 seconds elapse after turning the engine switch on (IG).
  • The IG voltage is 10 V or higher.
  • 2 seconds elapse after the IG voltage is 10 V or higher.
  • The lane departure warning camera cannot receive data from the driving support ECU assembly for 5 seconds or more.
  • CAN communication system
  • Driving Support ECU assembly
  • Lane departure warning camera
U0123 Lost Communication with Yaw Rate Sensor Module
  • 2 seconds elapse after turning the engine switch on (IG).
  • The IG voltage is 10 V or higher.
  • 2 seconds elapse after the IG voltage is 10 V or higher.
  • While the vehicle is being driven at 1 km/h or more, the lane departure warning camera cannot receive data from the airbag ECU assembly continuously for 5 seconds or more.
  • CAN communication system
  • Airbag ECU assembly
  • Lane departure warning camera
U0126 Lost Communication with Steering Angle Sensor Module
  • 2 seconds elapse after turning the engine switch on (IG).
  • The IG voltage is 10 V or higher.
  • 2 seconds elapse after the IG voltage is 10 V or higher.
  • The lane departure warning camera cannot receive data from the steering sensor for 5 seconds or more.
  • CAN communication system
  • Steering sensor
  • Lane departure warning camera
U0129 Lost Communication with Brake System Control Module
  • 2 seconds elapse after turning the engine switch on (IG).
  • The IG voltage is 10 V or higher.
  • 2 seconds elapse after the IG voltage is 10 V or higher.
  • The lane departure warning camera cannot receive data from the brake actuator assembly (skid control ECU) for 5 seconds or more.
  • CAN communication system
  • Brake actuator assembly (skid control ECU)
  • Lane departure warning camera
U0131 Lost Communication with Electric Power Steering ECU
  • 2 seconds elapse after turning the engine switch on (IG).
  • The IG voltage is 10 V or higher.
  • 2 seconds elapse after the IG voltage is 10 V or higher.
  • The lane departure warning camera cannot receive data from the power steering ECU for 5 seconds or more.
  • CAN communication system
  • Power steering ECU assembly
  • Lane departure warning camera
U0142 Lost Communication with Body Control Module "B"
  • 2 seconds elapse after turning the engine switch on (IG).
  • The IG voltage is 10 V or higher.
  • 2 seconds elapse after the IG voltage is 10 V or higher.
  • The lane departure warning camera cannot receive data from the main body ECU (multiplex network body ECU) for 5 seconds or more.
  • CAN communication system
  • Main body ECU (multiplex network body ECU)
  • Lane departure warning camera
U0155 Lost Communication with Instrument Panel Cluster (IPC) Control Module (Combination Meter)
  • 2 seconds elapse after turning the engine switch on (IG).
  • The IG voltage is 10 V or higher.
  • 2 seconds elapse after the IG voltage is 10 V or higher.
  • When the lane departure warning camera cannot receive data from the combination meter assembly continuously for 50 seconds or more.
  • CAN communication system
  • Combination meter assembly
  • Lane departure warning camera
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