DTC U0129-87: Lost Communication With Brake System Control Module Missing Message [09/2022 - 11/2022]: Description

The TCM receives signals from the skid control ECU via CAN communication. When DTCs indicating a CAN communication system malfunction are output, repair the CAN communication system before performing troubleshooting for each corresponding ECU or sensor.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory	Note
U0129-87	Lost Communication With Brake System Control Module Missing Message	for TMMMS Made: No communication between the TCM and skid control ECU (brake actuator assembly) for 2.4 seconds or more (1-trip logic) for TMC Made: No communication between the TCM and skid control ECU (brake actuator assembly) for 2.2 seconds or more (1-trip logic)	CAN communication system Skid control ECU (Brake actuator assembly) TCM	for TMMMS Made: Comes on for TMC Made: Does not come on	DTC stored	SAE Code: U0129

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

U0129-87

Lost Communication With Brake System Control Module Missing Message

for TMMMS Made:

No communication between the TCM and skid control ECU (brake actuator assembly) for 2.4 seconds or more (1-trip logic)

for TMC Made:

No communication between the TCM and skid control ECU (brake actuator assembly) for 2.2 seconds or more (1-trip logic)

CAN communication system
Skid control ECU (Brake actuator assembly)
TCM

for TMMMS Made: Comes on
for TMC Made: Does not come on

DTC stored

SAE Code:
U0129