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Home >> Lexus >> 2020 >> UX 250h Base >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Warning Systems >> Vehicle Proximity Notification System (Diagnostic Codes & Symptom Tests) >> Vehicle Proximity Notification System >> DTC U0129: Lost Communication with Brake System Control Module; DTC U0140: Lost Communication with Body Control Module; DTC U0293: Lost Communication with Hybrid/EV Powertrain Control Module [10/2019 - 08/2021] >> Description
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DTC U0129: Lost Communication with Brake System Control Module; DTC U0140: Lost Communication with Body Control Module; DTC U0293: Lost Communication with Hybrid/EV Powertrain Control Module [10/2019 - 08/2021]: Description

These DTCs are stored when the CAN communication system is malfunctioning.

DTC No. Detection Item DTC Detection Condition Trouble Area
U0129 Lost Communication with Brake System Control Module The vehicle approaching speaker controller does not receive data from the skid control ECU (brake booster with master cylinder assembly) for approximately 10 seconds or more.
  • CAN communication system
  • Skid control ECU (brake booster with master cylinder assembly)
U0140 Lost Communication with Body Control Module The vehicle approaching speaker controller does not receive data from the main body ECU (multiplex network body ECU) for approximately 10 seconds or more.
  • CAN communication system
  • Main body ECU (multiplex network body ECU)
U0293 Lost Communication with Hybrid/EV Powertrain Control Module The vehicle approaching speaker controller does not receive data from the hybrid vehicle control ECU for approximately 10 seconds or more.
  • CAN communication system
  • Hybrid vehicle control ECU