DTC U0129: Lost Communication with Brake System Control Module [10/2017 - 12/2021]: Procedure

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

   Powertrain > Engine and ECT > Trouble Codes 

5. 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: 

A 

GO TO CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [02/2017 - 05/2018]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [05/2018 - 09/2019]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2019 - 08/2020]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2020 - ] 

Result: 

B 

GO TO DTC CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2017 - 09/2019]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [09/2019 - 12/2021]