DTC U0073: Control Module Communication Bus OFF; DTC U0100: Lost Communication with ECM / PCM "A"; DTC U0129: Lost Communication with Brake System Control Module [02/2017 - 10/2017]: Procedure

1. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [02/2017 - 09/2019]

   Body Electrical > HL AutoLeveling > Clear DTCs 

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  2

1. Turn the ignition switch to ON.
2. Check for DTCs.

   Refer to DTC CHECK / CLEAR [02/2017 - 09/2019]

   Body Electrical > HL AutoLeveling > Trouble Codes 

   OK

   DTCs are not output.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [02/2017 - 10/2017] 

Result: 

NG 

GO TO CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [02/2017 - 05/2018]