DTC C1203: ECM Communication Circuit Malfunction: Description
WARNING: This page is about a different car, the 2011 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.
The circuit is used to send TR(A)C and VSC control information from the skid control ECU to the ECM, and engine control information from the ECM to the skid control ECU through the CAN communication system.
| DTC Code | DTC Detection Condition | Trouble Area |
|---|---|---|
| C1203 | Engine, drive source and destination variations that are sent from the ECM do not match the ones of the skid control ECU. | ECM |