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Home >> Lexus >> 2019 >> LC 500 >> Repair and Diagnosis (Single Page) >> Transmission >> Transmission Control Systems >> Electronic A/T Shift Lever System - Diagnostic Codes (Coupe) (1 Of 6) >> Electronic Shift Lever System >> DTC P085D-46: Gear Shift Control Module "A" Calibration / Parameter Memory Failure; DTC P1769-49: Gear Shift Control Module "A" Internal Electronic Failure; DTC P176B-9F: Fail Safe Signal (Gear Shift Control Module "A") Stuck Off [03/2017 - 06/2019] >> Description
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DTC P085D-46: Gear Shift Control Module "A" Calibration / Parameter Memory Failure; DTC P1769-49: Gear Shift Control Module "A" Internal Electronic Failure; DTC P176B-9F: Fail Safe Signal (Gear Shift Control Module "A") Stuck Off [03/2017 - 06/2019]: Description

The shift control ECU monitors its internal operation. When it detects an internal malfunction, the DTC is stored in the ECM. If this DTC is stored, replace the shift control ECU.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Warning Indicate
P085D-46 Gear Shift Control Module "A" Calibration / Parameter Memory Failure ECU internal malfunction (data flush malfunction) retries 3 times or more continuously
(1 trip detection logic)
Shift control ECU Does not come on
  • Master Warning Light
    • Comes on
  • Multi-information Display Error Message
    • Displayed
P1769-49 Gear Shift Control Module "A" Internal Electronic Failure ECU internal malfunction (AD timeout error) continuously occurs for 0.02 seconds or more
(1 trip detection logic)
Shift control ECU Comes on
  • Master Warning Light
    • Comes on
  • Multi-information Display Error Message
    • Displayed
P176B-9F Fail Safe Signal (Gear Shift Control Module "A") Stuck Off ECU internal malfunction (SBFS circuit malfunction) continuously occurs for 0.5 seconds or more
(1 trip detection logic)
Shift control ECU Does not come on
  • Master Warning Light
    • Comes on
  • Multi-information Display Error Message
    • Displayed