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 [06/2017 - 10/2020]: Procedure

1. Clear the DTCs.

   Powertrain > Radar Cruise 2 > Clear DTCs 

2. Perform the following procedure.

   HINT: 

   If the following procedure is not performed, the previously output DTC cannot be detected.

   1. Turn the ignition switch to ON.
   2. Turn the dynamic radar cruise control system on using the cruise control main switch.
   3. w/o Full-speed Range Following Function: Drive the vehicle at 36 km/h (22 mph) or more for 1 second or more.

      w/ Full-speed Range Following Function: Drive the vehicle at 5 km/h (3 mph) or more for 1 second or more.

3. Check for DTCs.

   Powertrain > Radar Cruise 2 > Trouble Codes 

   Result

   Result	Proceed to
   DTC U0100, U0125, U0126 and U0129 are not output	A
   DTC U0100, U0125, U0126 or U0129 is output	B

Result: 

A 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [06/2017 - 08/2018]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2018 - 09/2019]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2019 - 03/2020]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [03/2020 - 10/2020] 

Result: 

B 

GO TO CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [03/2017 - ]