DTC U11B9-87: Lost Communication with ECM/PCM "A" (ch6) Missing Message [09/2023 - ]: Wiring Diagram
WARNING: This page is about a different car, the 2024 Lexus TX 500h. However, it is still accessible from the selected car via links, so may be relevant.
Refer to ECM Power Source Circuit of the front SFI system.
Refer to ECM Power Source Circuit [09/2023 - ]
Refer to the wiring diagram for DTC P2533-14.