DTC U0291-87: Lost Communication with Gear Shift Control Module "B" Missing Message [10/2022 - 08/2023]: 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 ECM receives signals from the shift actuator ECU (shift control actuator assembly) via CAN communication. When DTCs indicating a CAN communication system malfunction are output, repair the CAN communication system before performing troubleshooting for each corresponding ECU or sensor.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | DTC Output from | Priority | Note |
|---|---|---|---|---|---|---|---|
| U0291-87 | Lost Communication with Gear Shift Control Module "B" Missing Message | No communication between the ECM and shift actuator ECU (shift control actuator assembly) for 1.24 seconds or more (1-trip logic) |
|
Comes on | Transmission | B | SAE Code: U0291 |