LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Toyota >> 2012 >> Prius Plug-in >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Communication Devices >> Can Communication System (Plug-In) (Diagnostic Codes & Symptom Tests) >> Can Communication System >> DTC U0129: Lost Communication with Brake System Control Module >> Description
April 5, 2026: LEMON Manuals is launched! Read the announcement.

DTC U0129: Lost Communication with Brake System Control Module: Description

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

HINT: 

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