DTC U1103-87: Lost Communication with Stop and Start Control Module Missing Message [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 ECM and engine stop and start ECU assembly send and receive signals via CAN communication.
If a communication error occurs between the ECM and engine stop and start ECU assembly, the ECM stores this DTC.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | DTC Output from | Priority | Note |
|---|---|---|---|---|---|---|---|
| U1103-87 | Lost Communication with Stop and Start Control Module Missing Message | While the ignition switch is ON, there is no communication between the ECM and engine stop and start ECU assembly for 1.16 seconds or more (1-trip detection logic). |
|
Does not come on | Transmission | A | SAE Code: U1103 |