DTC U0129: Lost Communication with Brake System Control Module [01/2019 - 11/2022]: Procedure

WARNING: This page is about a different car, the 2022 Toyota Corolla, 2021 Toyota Corolla, 2020 Toyota Corolla, and 2019 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.

CLEAR DTC AND PERFORM ROAD TEST

Clear the DTCs.
Powertrain > Engine and ECT > Clear DTCs

HINT:

Write down any currently output DTCs before clearing them.

Start the engine and drive the vehicle at a low speed.

Result

Proceed to
NEXT

Result:

NEXT

See step 2

CHECK DTC OUTPUT (DTC U0129)

Connect the Techstream to the DLC3.
Turn the ignition switch to ON.
Turn the Techstream on.
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
Powertrain > Engine and ECT > Trouble Codes

Read the DTCs using the Techstream.

Result

Result	Proceed to
DTC U0129 is not output	A
DTC U0129 is output	B

Result:

A

CHECK FOR INTERMITTENT PROBLEMS. Refer to CHECK FOR INTERMITTENT PROBLEMS [01/2019 - 11/2022]

Result:

B

GO TO CAN COMMUNICATION SYSTEM. Refer to DIAGNOSIS SYSTEM [01/2019 - 03/2019] , or refer to DIAGNOSIS SYSTEM [03/2019 - 09/2019] , or refer to DIAGNOSIS SYSTEM [09/2019 - 04/2020] , or refer to DIAGNOSIS SYSTEM [04/2020 - 09/2022] , or refer to DIAGNOSIS SYSTEM [09/2022 - 11/2022]