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Home >> Lexus >> 2023 >> LX 600 Base >> Repair and Diagnosis (Single Page) >> Engine Performance >> Testing & Diagnosis >> Engine Control System (W/O Canister Pump Module) - Diagnostic Codes (5 Of 5) & Circuit Tests (1 Of 2) >> SFI SYSTEM (w/o Canister Pump Module) >> DTC U0129-87: Lost Communication with Brake System Control Module Missing Message [12/2021 - ] >> Monitor Description
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Monitor Description

The ECM and skid control ECU send and receive signals via CAN communication.

If a communication error occurs between the ECM and skid control ECU, the ECM stores this DTC.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL DTC Output from Priority Note
U0129-87 Lost Communication with Brake System Control Module Missing Message All of the following conditions are met for 0.15 seconds or more (1 trip detection logic):
  • Ignition switch ON
  • Battery voltage is 9.5 V or higher
  • No communication between ECM and skid control ECU
  • CAN communication system
  • Skid control ECU
  • ECM
 - Engine B SAE: U0129
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