DTC C1438: Lost Communication with HV ECU [10/2020 - 10/2023]: Procedure

1. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [10/2020 - 10/2023]

   Chassis > ABS/VSC/TRAC > Clear DTCs 

2. Turn the power switch off.
3. Turn the power switch on (IG).
4. Check that no CAN communication system DTC is output.

   Chassis > ABS/VSC/TRAC > Trouble Codes 

   HINT: 

   If CAN communication system DTCs and relevant sensor DTCs are output simultaneously, troubleshoot the relevant sensor DTCs (for the ABS, VSC and/or electronically controlled brake system) after the CAN communication system returns to normal.

   Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2020 - 10/2023]

   Result

   Result	Proceed to
   DTC (C1438) is not output	A
   DTC (C1438) is output	B
   DTC (CAN communication system DTC) is output	C

Result: 

A 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2020 - 11/2021]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2021 - 10/2022]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - 10/2023] 

Result: 

B 

REPLACE SKID CONTROL ECU ASSEMBLY. Refer to  REMOVAL [10/2020 - 10/2022]  , or refer to  REMOVAL [10/2022 - 10/2023] 

Result: 

C 

INSPECT CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2020 - 11/2021]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2021 - 10/2023]