U0129 Code: Meaning, Causes, and Symptoms | OBD2 Codes

U0129 – Lost Communication With Brake System Control Module

 

U0129 Possible Symptoms

 

Engine Light ON (or Service Engine Soon Warning Light)

 

U0129 Possible Causes

 

Faulty Anti-Lock Brake System (ABS) Control Module,Anti-Lock Brake System (ABS) Control Module harness is open or shorted,Anti-Lock Brake System (ABS) Control Module circuit poor electrical connection

 

U0129 Description

 

The Powertrain Control Module (PCM) continuously monitors the Controller Area Network (CAN) for messages from the Transmission Control Module (TCM). The U0415 code sets when the TCM fails to receive the Anti-Lock Brake System (ABS) Control Module message within the defined amount of time.