DTC U0129 Lost Communication with Brake System Control Module: Description

WARNING: This page is about a different car, the 2008 Lexus LS 600hL. However, it is still accessible from the selected car via links, so may be relevant.

The No. 1 meter ECU communicates with the skid control ECU via the CAN line

DTC DETECTION CONDITION CHART

DTC Code	DTC Detection Condition	Trouble Area
U0129	When either of following conditions is detected 15 seconds have elapsed since engine started and IG voltage 10 5 V or more No communication with skid control ECU continues for 3 seconds or more (No communication with ECM or skid control ECU continues for 60 seconds or more)	CAN communication system