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Home >> Toyota >> 2020 >> Highlander L, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 45 (Engine Control System (T24A-FTS) - Diagnostic Codes (11 Of 11) & Circuit Tests (1 Of 2)) >> SFI System >> DTC U0129-87: Lost Communication with Brake System Control Module Missing Message [11/2023 - ] >> Monitor Description

Monitor Description

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The ECM and skid control ECU (brake actuator assembly) send and receive signals via CAN communication.

If a communication error occurs between the ECM and skid control ECU (brake actuator assembly), the ECM stores this DTC.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Note
U0129-87 Lost Communication with Brake System Control Module Missing Message All of the following conditions are met for 2.22 seconds or more (1 trip detection logic):
  • Ignition switch ON
  • Battery voltage is 10 V or higher
  • No communication between ECM and skid control ECU (brake actuator assembly)
  • CAN communication system
  • Skid control ECU (brake actuator assembly)
  • ECM
 Comes on SAE Code: U0129
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