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Home >> Lexus >> 2019 >> ES 350 Luxury >> Repair and Diagnosis >> External Pages >> Different car >> Section 93 (Engine Control System (A25A-FKS) - Diagnostic Codes (12 Of 12), Circuit Tests & Symptom Tests (1 Of 2)) >> SFI System >> DTC U0129-87: Lost Communication with Brake System Control Module Missing Message [08/2021 - ] >> 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 Memory Note
U0129-87 Lost Communication with Brake System Control Module Missing Message All of the following conditions are met for 2.2 seconds or more (1 trip detection logic):
  • Engine switch on (IG)
  • 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
 Does not come on DTC stored
  • SAE Code: U0129
  • DTC for Mexico Models: Applies
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