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Home >> Lexus >> 2021 >> LS 500 Base, AWD >> Repair and Diagnosis (Single Page) >> Transmission >> Transmission Control Systems >> Electronic A/T Shift Lever System (Aga0F) - Diagnostic Codes (5 Of 5), Circuit & Symptom Tests (1 Of 2) >> Electronic Shift Lever System >> DTC U0103-87: Lost Communication with Gear Shift Control Module "A" Missing Message [12/2017 - 10/2020] >> Description

DTC U0103-87: Lost Communication with Gear Shift Control Module "A" Missing Message [12/2017 - 10/2020]: Description

The shift control ECU transmits and receives signals via CAN communication to and from the ECM.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Warning Indicate
U0103-87 Lost Communication with Gear Shift Control Module "A" Missing Message 3 seconds elapse after turning engine switch on (IG) with battery voltage 10.5 V or higher and a CAN communication malfunction between ECM occurs continuously for 1.25 second or more.
(1 trip detection logic)
  • ECM
  • Shift control ECU
  • Wire harness or connector
Comes on
  • Master Warning Light
    • Comes on
  • Multi-information Display Error Message
    • Displayed