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Home >> Lexus >> 2019 >> LS 500 Base, AWD >> Repair and Diagnosis (Single Page) >> Transmission >> Transmission Control Systems >> Electronic A/T Shift Lever System (Aga0F) - Diagnostic Codes (2 Of 5) >> Electronic Shift Lever System >> DTC P176A-87: Lost Communication with Fail Safe Signal (Gear Shift Control Module "A") Missing Message [12/2017 - 10/2023] >> Description
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DTC P176A-87: Lost Communication with Fail Safe Signal (Gear Shift Control Module "A") Missing Message [12/2017 - 10/2023]: Description

The shift control ECU sends SBFS (fail-safe) signals to the ECM.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Warning Indicate
P176A-87 Lost Communication with Fail Safe Signal (Gear Shift Control Module "A") Missing Message The SBFS (fail-safe) signals sent from the shift control ECU cannot be received by the ECM continuously for 2 seconds or more.
(1 trip detection logic)
  • Shift control ECU
  • ECM
  • Wire harness or connector
Does not come on
  • Master Warning Light
    • Comes on
  • Multi-information Display Error Message
    • Displayed