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Home >> Lexus >> 2022 >> NX 350 Base >> Repair and Diagnosis (Single Page) >> Transmission >> Automatic Trans >> Electronic A/T Shift Lever System - Diagnostic Codes & Circuit Tests >> Electronic Shift Lever System >> DTC P18A6-00: Gear Shift Control Module "A"/"B" (Sub CPU) Ignition Switch On/Start Position Signal Compare Failure; DTC P18A6-62: Gear Shift Control Module "A"/"B" Ignition Switch On/Start Position Signal Compare Failure [11/2021 - ] >> Description
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DTC P18A6-00: Gear Shift Control Module "A"/"B" (Sub CPU) Ignition Switch On/Start Position Signal Compare Failure; DTC P18A6-62: Gear Shift Control Module "A"/"B" Ignition Switch On/Start Position Signal Compare Failure [11/2021 - ]: Description

The shift actuator ECU activates when receiving an IGR signal.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Warning Indicate DTC Output from Priority Note
P18A6-00 Gear Shift Control Module "A"/"B" (Sub CPU) Ignition Switch On/Start Position Signal Compare Failure When the ignition switch is ON and the BUB1 voltage is a certain value or more, a malfunction of the IGR1 terminal voltage is detected
(1 trip detection logic)
  • Shift control actuator assembly (shift actuator ECU)
  • IGR NO. 2 Relay
  • Harness and connector
Does not come on Multi-information Display Error Message 
  • Displayed
Transmission A SAE: P18A6
P18A6-62 Gear Shift Control Module "A"/"B" Ignition Switch On/Start Position Signal Compare Failure When the ignition switch is ON and the BAT1 voltage is a certain value or more, a malfunction of the IGR1 terminal voltage is detected
(1 trip detection logic)
  • Shift control actuator assembly (shift actuator ECU)
  • IGR NO. 2 Relay
  • Harness and connector
Does not come on Multi-information Display Error Message 
  • Displayed
Transmission A SAE: P18A6