Monitor Description

WARNING: This page is about a different car, the 2025 Toyota RAV4, 2024 Toyota RAV4, 2023 Toyota RAV4, 2022 Toyota RAV4, and 2021 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.

The ECM and swing grille actuator assembly (active grille air shutter ECU) send and receive signals via CAN communication.

If a communication error occurs between the ECM and swing grille actuator assembly, the ECM stores this DTC.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory	Note
U0284-87	Lost Communication with Active Grille Air Shutter Module "A" Missing Message	All of the following conditions are met for 10.6 seconds or more (1 trip detection logic): Ignition switch ON Auxiliary battery voltage is 10 V or higher No communication between ECM and swing grille actuator assembly	CAN communication system Swing grille actuator assembly ECM	Comes on	DTC stored	SAE Code: U0284 DTC for Mexico Models: Does not apply