Monitor Description

WARNING: This page is about a different car, the 2020 Toyota RAV4 and 2019 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.

The ECM and skid control ECU (brake actuator assembly) send and receive signals via CAN communication.

If a communication error occurs between the ECM and skid control ECU (brake actuator assembly), the ECM stores this DTC.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory	Note
U0129-87	Lost Communication with Brake System Control Module Missing Message	All of the following conditions are met for 2.4 seconds or more (1 trip detection logic): Ignition switch ON Battery voltage is 10 V or higher No communication between ECM and skid control ECU (brake actuator assembly)	CAN communication system Skid control ECU (brake actuator assembly) ECM	Does not come on	DTC stored	SAE Code: U0129