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Home >> Toyota >> 2025 >> Prius LE >> Repair and Diagnosis (Single Page) >> Brakes >> Mechanical - Hydraulic >> Electronically Controlled Brake System - Diagnostic Codes (6 Of 6), Circuit Tests & Symptom Tests >> Electronically Controlled Brake System >> DTC U0110-00: Lost Communication with Drive Motor Control Module "A"; DTC U0129-87: Lost Communication with Brake System Control Module "A" Missing Message; DTC U0293-00: Lost Communication with Hybrid/EV Powertrain Control Module; DTC U1106-00: Lost Communication with Electric Parking Brake Module; DTC U114A-00: Lost Communication with Sub Battery System (System 2) Missing Message; DTC U1150-00: Lost Communication with Hybrid Powertrain Control Module (ch2); DTC U117D-87: Lost Communication with Brake System Control Module (ch4) Missing Message [12/2022 - 03/2023] >> Description
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DTC U0110-00: Lost Communication with Drive Motor Control Module "A"; DTC U0129-87: Lost Communication with Brake System Control Module "A" Missing Message; DTC U0293-00: Lost Communication with Hybrid/EV Powertrain Control Module; DTC U1106-00: Lost Communication with Electric Parking Brake Module; DTC U114A-00: Lost Communication with Sub Battery System (System 2) Missing Message; DTC U1150-00: Lost Communication with Hybrid Powertrain Control Module (ch2); DTC U117D-87: Lost Communication with Brake System Control Module (ch4) Missing Message [12/2022 - 03/2023]: Description

The No. 1 skid control ECU (brake booster with master cylinder assembly) communicates with the following ECUs and sensors via CAN communication.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL DTC Output from Priority Note
U0110-00 Lost Communication with Drive Motor Control Module "A" When terminal IGR voltage is 9.5 V or more, data from the inverter with converter assembly cannot be received for 2 seconds or more.
  • CAN communication line
  • Inverter with converter assembly
  • No. 1 skid control ECU (brake booster cylinder assembly)
 Comes on Brake/EPB B
  • SAE Code: U0110
  • Output ECU: Both skid control ECUs
U0129-87 Lost Communication with Brake System Control Module "A" Missing Message When the voltage at terminal IGR is 9.5 V or more, communication between the No. 1 skid control ECU (brake booster with master cylinder assembly) and No. 2 skid control ECU (brake actuator assembly) is not possible for 2 seconds or more.
  • CAN communication line
  • No. 2 skid control ECU (brake actuator assembly)
  • No. 1 skid control ECU (brake booster with master cylinder assembly)
 Comes on Brake/EPB B
  • SAE Code: U0129
  • Output ECU: Both skid control ECUs
U0293-00 Lost Communication with Hybrid/EV Powertrain Control Module When terminal IGR voltage is 9.5 V or more, data from the hybrid vehicle control ECU cannot be received for 2 seconds or more.
  • CAN communication line
  • Hybrid vehicle control ECU
  • No. 1 skid control ECU (brake booster with master cylinder assembly)
 Comes on Brake/EPB B
  • SAE Code: U0293
  • Output ECU: Both skid control ECUs
U1106-00 Lost Communication with Electric Parking Brake Module With terminal IGR voltage at 9.5 V or more, data cannot be received from the No. 2 skid control ECU (brake actuator assembly) for 1 second or more.
  • CAN communication line
  • No. 2 skid control ECU (brake actuator assembly)
  • No. 1 skid control ECU (brake booster with master cylinder assembly)
 Does not come on Brake Booster B Output ECU: No. 1 skid control ECU (brake booster with master cylinder assembly)
U114A-00 Lost Communication with Sub Battery System (System 2) Missing Message When terminal IGR voltage is 9.5 V or more, data from the integration control supply cannot be received for 2 seconds or more.
  • CAN communication line
  • Integration control supply
  • No. 1 skid control ECU (brake booster with master cylinder assembly)
 Does not come on Brake Booster B Output ECU: No. 1 skid control ECU (brake booster with master cylinder assembly)
U1150-00 Lost Communication with Hybrid Powertrain Control Module (ch2) When terminal IGR voltage is 9.5 V or more, data from the hybrid vehicle control ECU cannot be received for 2 seconds or more.
  • CAN communication line
  • Hybrid vehicle control ECU
  • No. 1 skid control ECU (brake booster with master cylinder assembly)
 Comes on Brake/EPB B
  • SAE Code: U1150
  • Output ECU: Both skid control ECUs
U117D-87 Lost Communication with Brake System Control Module (ch4) Missing Message When the voltage at terminal IGR is 9.5 V or more, communication between the No. 1 skid control ECU (brake booster with master cylinder assembly) and No. 2 skid control ECU (brake actuator assembly) is not possible for 2 seconds or more.
  • CAN communication line
  • No. 2 skid control ECU (brake actuator assembly)
  • No. 1 skid control ECU (brake booster with master cylinder assembly)
 Comes on Brake/EPB B
  • SAE Code: U117D
  • Output ECU: Both skid control ECUs
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