DTC U0129: Lost Communication with Brake System Control Module [11/2021 - ]: Procedure

WARNING: This page is about a different car, the 2024 Lexus IS 500, 2023 Lexus IS 500, and 2022 Lexus IS 500. However, it is still accessible from the selected car via links, so may be relevant.

CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC U0129)

Connect the Techstream to the DLC3.
Turn the engine switch on (IG).
Turn the Techstream on.
Enter the following menus: System Select / Health Check.

Read the DTCs

Result

Result	Proceed to
DTC U0129 is output	A
DTC U0129 and other DTCs are output	B

HINT:

If any DTCs other than U0129 are output, troubleshoot those DTCs first.

Result:

GO TO CAN COMMUNICATION SYSTEM. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2018 - ]

Result:

GO TO DTC CHART. Refer to DIAGNOSTIC TROUBLE CODE CHART [11/2021 - ]