DTC U11B9-87: Lost Communication with ECM/PCM "A" (ch6) Missing Message [09/2023 - ]: Description
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.
The TCM sends and receives data to and from the ECM via local CAN communication.
When a communication malfunction occurs with the ECM, the TCM outputs a DTC.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | DTC Output from | Priority | Note |
|---|---|---|---|---|---|---|---|
| U11B9-87 | Lost Communication with ECM/PCM "A" (ch6) Missing Message | No communication between the TCM and ECM for 1 second or more (1-trip detection logic). |
|
Comes on | Transmission | A | SAE: U11B9 |