DTC C1203: ECM Communication Circuit Malfunction [11/2016 - ]: Description

This circuit is used to send TRAC and VSC operation information from the skid control ECU (brake actuator assembly) to the ECM, and engine control information from the ECM to the skid control ECU (brake actuator assembly) via CAN communication.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
C1203	ECM Communication Circuit Malfunction	Either of the following is detected: Engine and drive source that are sent from the ECM do not match the ones of the skid control ECU (brake actuator assembly). No stored information for engine and drive source.	The wrong ECU was installed Skid control ECU (brake actuator assembly)