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Home >> Toyota >> 2017 >> Prius C Two >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Drivers Assistance Systems - ADAS >> Lane Departure Alert System - Diagnostic Codes & Circuit Tests >> Lane Departure Alert System >> 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 U0155: Lost Communication with Combination Meter; DTC U0293: Lost Communication with Hybrid Control Module [11/2015 - ] >> Description
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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 U0155: Lost Communication with Combination Meter; DTC U0293: Lost Communication with Hybrid Control Module [11/2015 - ]: Description

A DTC is output when a communication malfunction occurs between the sensors and ECUs.

DTC No. DTC Detection Condition Trouble Area
U0123
  • All of the following conditions are met:
    • 3 seconds have elapsed since the power switch was turned on (IG).
    • The auxiliary battery voltage is 10 V or more for 3 seconds or more.
    • The pre-collision city sensor does not receive data from the yaw rate sensor for 1 second or more.
  • CAN communication system
  • Yaw rate sensor (Airbag sensor assembly)
  • Pre-collision city sensor
U0126
  • All of the following conditions are met:
    • 3 seconds have elapsed since the power switch was turned on (IG).
    • The auxiliary battery voltage is 10 V or more for 3 seconds or more.
    • The pre-collision city sensor does not receive data from the steering sensor for 1 second or more.
  • CAN communication system
  • Steering sensor (Spiral cable with sensor sub-assembly)
  • Pre-collision city sensor
U0129
  • All of the following conditions are met:
    • 3 seconds have elapsed since the power switch was turned on (IG).
    • The auxiliary battery voltage is 10 V or more for 3 seconds or more.
    • The pre-collision city sensor does not receive data from the skid control ECU (brake booster with master cylinder assembly) for 8 seconds or more.
  • CAN communication system
  • Skid control ECU (Brake booster with master cylinder assembly)
  • Pre-collision city sensor
U0155
  • All of the following conditions are met:
    • 3 seconds have elapsed since the power switch was turned on (IG).
    • The auxiliary battery voltage is 10 V or more for 3 seconds or more.
    • The pre-collision city sensor does not receive data from the combination meter assembly for 80 seconds or more.
  • CAN communication system
  • Combination meter assembly
  • Pre-collision city sensor
U0293 Both of the following conditions are met:
  1. All of the following conditions are met:
    • 3 seconds have elapsed since the power switch was turned on (IG).
    • The auxiliary battery voltage is 10 V or more for 3 seconds or more.
  2. Both of the following conditions are met for 8 seconds or more:
    • The vehicle is being driven at 5 km/h (4 mph) or more.
    • The pre-collision city sensor does not receive data from the hybrid vehicle control ECU.
  • CAN communication system
  • Hybrid vehicle control ECU
  • Pre-collision city sensor
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