DTC U0129: Lost Communication with Brake System Control Module [08/2013 - ]: Description

WARNING: This page is about a different car, the 2014 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.

DTC No.	DTC Detection Condition	Trouble Area
U0129	No communication from the brake booster with master cylinder assembly (skid control ECU) continues.	Brake booster with master cylinder assembly (skid control ECU) branch line or connector Power source circuit of brake booster with master cylinder assembly (skid control ECU) Brake booster with master cylinder assembly (skid control ECU) ground circuit Brake booster with master cylinder assembly (skid control ECU)

HINT:

This diagnosis procedure is for when DTC U0129 is output only by the power management control ECU (Techstream display: Hybrid Control).