DTC U1103-87: Lost Communication with Stop and Start Control Module Missing Message [10/2022 - 11/2023]: Description

WARNING: This page is about a different car, the 2025 Toyota Highlander, 2024 Toyota Highlander, and 2023 Toyota Highlander. 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	Memory	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).	ECM Engine stop and start ECU assembly CAN communication system	Does not come on	DTC stored	SAE Code: U1103