DTC U0100: Lost Communication with ECM / PCM "A"; DTC U0125: Lost Communication with Yaw Rate Sensor Module; DTC U0126: Lost Communication with Steering Angle Sensor Module; DTC U0129: Lost Communication with Brake System Control Module; DTC U1104: Lost Communication with Driving Support ECU [09/2014 - 11/2017]: Procedure

1. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [09/2014 - 11/2017]

   Powertrain > Radar Cruise > Clear DTCs 

2. Make sure that the DTC detection conditions are met.

   HINT: 

   If the detection conditions are not met, the system cannot detect the malfunction.

3. Check for DTCs.

   Refer to DTC CHECK / CLEAR [09/2014 - 11/2017]

   Powertrain > Radar Cruise > Trouble Codes 

   Result

   Result	Proceed to
   CAN communication system DTCs are not output	A
   CAN communication system DTCs are output	B

Result: 

A 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2014 - 08/2016]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2016 - 11/2017] 

Result: 

B 

GO TO CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2014 - 11/2017]