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Home >> Toyota >> 2025 >> 4Runner TRD Pro >> Repair and Diagnosis (Single Page) >> Brakes >> Mechanical - Hydraulic >> Electronically Controlled Brake System (HEV) - Diagnostic Codes (5 Of 5), Symptom Tests & Circuit Tests >> ELECTRONICALLY CONTROLLED BRAKE SYSTEM (except Gasoline Model) >> DTC U0100-00: Lost Communication with ECM/PCM "A"; DTC U0100-87: Lost Communication with ECM/PCM "A" Missing Message; DTC U0101-00: Lost Communication with TCM; DTC U0101-87: Lost Communication with TCM Missing Message; DTC U0114-87: Lost Communication with Four-wheel Drive Clutch Control Module Missing Message; DTC U0125-87: Lost Communication with Multi-axis Acceleration Sensor Module Missing Message; DTC U0126-87: Lost Communication with Steering Angle Sensor Module Missing Message; DTC U0129-87: Lost Communication with Brake System Control Module "A" Missing Message; DTC U0131-87: Lost Communication With Power Steering Control Module Missing Message; DTC U0140-87: Lost Communication with Body Control Module Missing Message; DTC U0151-87: Lost Communication with Restraints Control Module Missing Message; DTC U025E-87: Lost Communication with Electronic Brake Booster Control Module "A" Missing Message; DTC U1106-00: Lost Communication with Electric Parking Brake Module; DTC U1107-87: Lost Communication with Power Management Module Missing Message; DTC U111A-00: Lost Communication with ECM/PCM "A" (ch2); DTC U111A-87: Lost Communication with ECM/PCM "A" (ch2) Missing Message; DTC U1159-87: Lost Communication with Electronic Brake Booster Control Module "A" (ch3) Missing Message; DTC U117D-87: Lost Communication with Brake System Control Module (ch4) Missing Message [12/2024 - ] >> Description
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DTC U0100-00: Lost Communication with ECM/PCM "A"; DTC U0100-87: Lost Communication with ECM/PCM "A" Missing Message; DTC U0101-00: Lost Communication with TCM; DTC U0101-87: Lost Communication with TCM Missing Message; DTC U0114-87: Lost Communication with Four-wheel Drive Clutch Control Module Missing Message; DTC U0125-87: Lost Communication with Multi-axis Acceleration Sensor Module Missing Message; DTC U0126-87: Lost Communication with Steering Angle Sensor Module Missing Message; DTC U0129-87: Lost Communication with Brake System Control Module "A" Missing Message; DTC U0131-87: Lost Communication With Power Steering Control Module Missing Message; DTC U0140-87: Lost Communication with Body Control Module Missing Message; DTC U0151-87: Lost Communication with Restraints Control Module Missing Message; DTC U025E-87: Lost Communication with Electronic Brake Booster Control Module "A" Missing Message; DTC U1106-00: Lost Communication with Electric Parking Brake Module; DTC U1107-87: Lost Communication with Power Management Module Missing Message; DTC U111A-00: Lost Communication with ECM/PCM "A" (ch2); DTC U111A-87: Lost Communication with ECM/PCM "A" (ch2) Missing Message; DTC U1159-87: Lost Communication with Electronic Brake Booster Control Module "A" (ch3) Missing Message; DTC U117D-87: Lost Communication with Brake System Control Module (ch4) Missing Message [12/2024 - ]: Description

The airbag ECU assembly has a built-in yaw rate and acceleration sensor.

The following DTCs are output when there is a communication malfunction between a sensor or ECU.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL DTC Output from Priority Note
U0100-00 Lost Communication with ECM/PCM "A" When the power source voltage is normal, data is not able to be received from the ECM for 2 seconds or more.
  • CAN communication line
  • ECM
  • 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)
U0100-87 Lost Communication with ECM/PCM "A" Missing Message When the power source voltage is normal, data is not able to be received from the ECM for 2 seconds or more.
  • CAN communication line
  • ECM
  • No. 2 skid control ECU (brake actuator assembly)
 Comes on Brake/EPB B
  • SAE Code: U0100
  • Output ECU: No. 2 skid control ECU (brake actuator assembly)
U0101-00 Lost Communication with TCM When the power source voltage is normal, data is not able to be received from the TCM for 2 seconds or more.
  • CAN communication line
  • TCM
  • 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)
U0101-87 Lost Communication with TCM Missing Message When the power source voltage is normal, data is not able to be received from the TCM for 2 seconds or more.
  • CAN communication line
  • TCM
  • No. 2 skid control ECU (brake actuator assembly)
 Comes on Brake/EPB B
  • SAE Code: U0101
  • Output ECU: No. 2 skid control ECU (brake actuator assembly)
U0114-87 Lost Communication with Four-wheel Drive Clutch Control Module Missing Message When the power source voltage is normal, data is not able to be received from the 4 wheel drive control ECU for 2 seconds or more.
  • CAN communication line
  • 4 wheel drive control ECU
  • No. 2 skid control ECU (brake actuator assembly)
 Comes on Brake/EPB B
  • SAE Code: U0114
  • Output ECU: No. 2 skid control ECU (brake actuator assembly)
U0125-87 Lost Communication with Multi-axis Acceleration Sensor Module Missing Message When the power source voltage is normal, data is not able to be received from the yaw rate and acceleration sensor (airbag ECU assembly) for 1 second or more.
  • CAN communication line
  • Yaw rate and acceleration sensor (airbag ECU assembly)
  • No. 2 skid control ECU (brake actuator assembly)
 Comes on Brake/EPB B
  • SAE Code: U0125
  • Output ECU: No. 2 skid control ECU (brake actuator assembly)
U0126-87 Lost Communication with Steering Angle Sensor Module Missing Message When the power source voltage is normal, data is not able to be received from the steering sensor for 1 second or more.
  • CAN communication line
  • Steering sensor
  • No. 2 skid control ECU (brake actuator assembly)
 Does not come on Brake/EPB B Output ECU: No. 2 skid control ECU (brake actuator assembly)
U0129-87 Lost Communication with Brake System Control Module "A" Missing Message When the power source voltage is normal, 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 1 second or more.
  • CAN communication line
  • No. 1 skid control ECU (brake booster with master cylinder assembly)
  • No. 2 skid control ECU (brake actuator assembly)
 Comes on Brake/EPB B
  • SAE Code: U0129
  • Output ECU: Both skid control ECUs
U0131-87 Lost Communication With Power Steering Control Module Missing Message When the power source voltage is normal, data is not able to be received from the power steering ECU (rack and pinion power steering gear assembly) for 1 second or more.
  • CAN communication line
  • Power steering ECU (rack and pinion power steering gear assembly)
  • No. 2 skid control ECU (brake actuator assembly)
 Does not come on Brake/EPB B Output ECU: No. 2 skid control ECU (brake actuator assembly)
U0140-87 Lost Communication with Body Control Module Missing Message When the power source voltage is normal, data is not able to be received from the main body ECU (multiplex network body ECU) for 2 seconds or more.
  • CAN communication line
  • Main body ECU (multiplex network body ECU)
  • No. 2 skid control ECU (brake actuator assembly)
 Does not come on Brake/EPB B Output ECU: No. 2 skid control ECU (brake actuator assembly)
U0151-87 Lost Communication with Restraints Control Module Missing Message When the power source voltage is normal, data is not able to be received from the airbag ECU assembly for 5 seconds or more.
  • CAN communication line
  • Airbag ECU assembly
  • No. 2 skid control ECU (brake actuator assembly)
 Does not come on Brake/EPB B Output ECU: No. 2 skid control ECU (brake actuator assembly)
U025E-87 Lost Communication with Electronic Brake Booster Control Module "A" Missing Message When the power source voltage is normal, 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. 1 skid control ECU (brake booster with master cylinder assembly)
  • No. 2 skid control ECU (brake actuator assembly)
 Comes on Brake/EPB B
  • SAE Code: U025E
  • Output ECU: Both skid control ECUs
U1106-00 Lost Communication with Electric Parking Brake Module When the power source voltage is normal, data is not able to be received from the No. 2 skid control ECU (brake actuator assembly) for 1 second or more.
  • CAN communication line
  • No. 1 skid control ECU (brake booster with master cylinder assembly)
  • No. 2 skid control ECU (brake actuator assembly)
 Does not come on Brake Booster B Output ECU: No. 1 skid control ECU (brake booster with master cylinder assembly)
U1107-87 Lost Communication with Power Management Module Missing Message When the power source voltage is normal, data is not able to be received from the certification ECU(smart key ECU assembly) for 3 seconds or more.
  • CAN communication line
  • Certification ECU (smart key ECU assembly)
  • No. 2 skid control ECU (brake actuator assembly)
 Comes on Brake/EPB B
  • SAE Code: U1107
  • Output ECU: No. 2 skid control ECU (brake actuator assembly)
U111A-00 Lost Communication with ECM/PCM "A" (ch2) When the power source voltage is normal, data is not able to be received from the ECM for 2 seconds or more.
  • CAN communication line
  • ECM
  • 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)
U111A-87 Lost Communication with ECM/PCM "A" (ch2) Missing Message When the power source voltage is normal, data is not able to be received from the ECM for 2 seconds or more.
  • CAN communication line
  • ECM
  • No. 2 skid control ECU (brake actuator assembly)
 Comes on Brake/EPB B
  • SAE Code: U111A
  • Output ECU: No. 2 skid control ECU (brake actuator assembly)
U1159-87 Lost Communication with Electronic Brake Booster Control Module "A" (ch3) Missing Message When the power source voltage is normal, 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. 1 skid control ECU (brake booster with master cylinder assembly)
  • No. 2 skid control ECU (brake actuator assembly)
 Does not come on Brake/EPB B Output ECU: No. 2 skid control ECU (brake actuator assembly)
U117D-87 Lost Communication with Brake System Control Module (ch4) Missing Message When the power source voltage is normal, 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. 1 skid control ECU (brake booster with master cylinder assembly)
  • No. 2 skid control ECU (brake actuator assembly)
 Comes on Brake/EPB B
  • SAE Code: U117D
  • Output ECU: Both skid control ECUs
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