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HOMESERVICE MANUALSTOYOTA20254RUNNER SR5, 4WDREPAIR AND DIAGNOSIS (SINGLE PAGE)STEERINGMANUAL STEERINGPOWER STEERING SYSTEM - DIAGNOSTIC CODES & CIRCUIT TESTSPOWER STEERING SYSTEMDTC U0100-87: LOST COMMUNICATION WITH ECM/PCM "A" MISSING MESSAGE; DTC U0129-87: LOST COMMUNICATION WITH BRAKE SYSTEM CONTROL MODULE MISSING MESSAGE; DTC U0293-87: LOST COMMUNICATION WITH HYBRID/EV POWERTRAIN CONTROL MODULE MISSING MESSAGE [12/2024 - ]DESCRIPTION
2025 Toyota 4Runner SR5, 4WD

DTC U0100-87: Lost Communication with ECM/PCM "A" Missing Message; DTC U0129-87: Lost Communication with Brake System Control Module Missing Message; DTC U0293-87: Lost Communication with Hybrid/EV Powertrain Control Module Missing Message [12/2024 - ]: Description

2025 Toyota 4Runner SR5, 4WDSECTION Description

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 Warning Indicate DTC Output from Priority Note
U0100-87 Lost Communication with ECM/PCM "A" Missing Message Lost communication with ECM
  • ECM
  • CAN communication system
  • Rack and pinion power steering gear assembly
 EPS warning light: Does not come on EMPS B For Gasoline Model
U0129-87 Lost Communication with Brake System Control Module Missing Message Lost communication with No. 2 skid control ECU (brake actuator assembly)*1
Lost communication with skid control ECU (brake actuator assembly)*2
  • No. 2 skid control ECU (brake actuator assembly)*1
  • Skid control ECU (brake actuator assembly)*2
  • CAN communication system
  • Rack and pinion power steering gear assembly
 EPS warning light: Comes on EMPS B -
U0293-87 Lost Communication with Hybrid/EV Powertrain Control Module Missing Message Lost communication with hybrid vehicle control ECU assembly
  • Hybrid vehicle control ECU assembly
  • CAN communication system
  • Rack and pinion power steering gear assembly
 EPS warning light: Does not come on EMPS B Except Gasoline Model
  1. *1: except Gasoline Model
  2. *2: for Gasoline Model
RENDER: 1.0x

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