DTC P178A-14: Gear Shift Control Module "B" Wake-up Circuit Short to Ground or Open; DTC P178D-14: Gear Shift Control Module "B" (Sub CPU) Wake-up Circuit Short to Ground or Open [10/2022 - ]: Description
WARNING: This page is about a different car, the 2025 Lexus RX 350, 2024 Lexus RX 350, and 2023 Lexus RX 350. However, it is still accessible from the selected car via links, so may be relevant.
The shift actuator ECU starts when it receives a WAKE signal from the shift control ECU.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Warning Indicate | DTC Output from | Priority | Note |
|---|---|---|---|---|---|---|---|---|
| P178A-14 | Gear Shift Control Module "B" Wake-up Circuit Short to Ground or Open | When the battery voltage and BAT1 terminal voltage are a certain value or more, a low voltage is detected at the WAKE terminal (1 trip detection logic) |
|
Does not come on | Multi-information Display Error Message
|
Transmission | A | SAE: P178B |
| P178D-14 | Gear Shift Control Module "B" (Sub CPU) Wake-up Circuit Short to Ground or Open | When the battery voltage and BAT1 terminal voltage are a certain value or more, a low voltage is detected at the WAKE terminal (1 trip detection logic) |
|
Does not come on | Multi-information Display Error Message
|
Transmission | A | SAE: P178E |