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Home >> Lexus >> 2024 >> GX 550 Premium+ >> Repair and Diagnosis (Single Page) >> General Information >> Towing >> Trailer Brake Control System - Diagnostic Codes & Symptom Tests >> Trailer Brake Control System >> DTC U0076-88: Control Module Communication Bus "D" Off Bus Off; DTC U1171-87: Lost Communication with Brake System Control Module (ch3) Missing Message [12/2023 - ] >> Description
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DTC U0076-88: Control Module Communication Bus "D" Off Bus Off; DTC U1171-87: Lost Communication with Brake System Control Module (ch3) Missing Message [12/2023 - ]: Description

The trailer brake control ECU (brake control with bracket relay) receives signals from the skid control ECU (brake actuator assembly) via CAN communication.

DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from Priority
U0076-88 Control Module Communication Bus "D" Off Bus Off Bus off condition continues for 1 second or more CAN communication system Trailer Brake Controller B
U1171-87 Lost Communication with Brake System Control Module (ch3) Missing Message The trailer brake control ECU (brake control with bracket relay) is continuously unable to receive data from the skid control ECU (brake actuator assembly) for 1 second or more.
  • CAN communication system
  • Trailer brake control ECU (Brake control with bracket relay)
  • Skid control ECU (Brake actuator assembly)
Trailer Brake Controller B