DTC C1203: ECM Communication Circuit Malfunction; DTC C1270: Initialization Incomplete (Test Mode DTC) [09/2014 - 11/2017]: 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 information sent from the ECM does not match the information stored in the skid control ECU (brake actuator assembly). No stored information for destination.	An incorrect ECU is installed. Skid control ECU (brake actuator assembly)
C1270	Initialization Incomplete (Test Mode DTC)	Detected only during Test Mode.	ECM Skid control ECU (brake actuator assembly) CAN communication system (skid control ECU to ECM)